Hahah I just finished rebuilding a Hyosung ez100 moped, nearly everything on it was a copy of a Suzuki address, once I worked out what it was a copy of parts became so much easier to source
Take a look at the Chinese made equivalents. Their engines can be even smaller. If it were mine I'd strip all the flash tat off it, paint it black and turn it into a 'bobber'.
I think it’s just a general term. When someone says something is made in china it might not actually be made in china, but it might as well be lol because it’s just as poorly made. Anything that comes out of South America is usually crap (besides Japan of course)
nothing in comon with the suzuki engine - this is only a 250 - they also have an 125 v-twin and of course the 650 which many thinks is the same as the suzuki - it isnt - but the gt model dooes look a lot like the original sv 650...... Owned the gt version with this engine - nice little engine..
It's not the same thing. The "spark tester", not "spark-plug tester" is made to simply put inline so you can see if the bike has spark without pulling the spark-plugs out. It's a diagnostic tool to see if the motorcycle is producing spark, not the spark-plug. 👍🏼
@@billycarpenter4740True. When I was a kid my brother's very first street bike was a Honda Rebel 250. It was totally gutless, but it provided a smooth beautiful ride until he hit a dog on it. 🤷🏻♂️
@@stkyfngrszmooth As a kid back in the early 1970's I had both a Suzuki TS 100 and A Suzuki TS 250 . Both were good street/dirt bikes for getting around locally, the 250cc being enough to get up to highway speeds and driving out for hours. Maybe not 750cc bikes but enough to have fun with and ocassionally carrying a buddy along. With age now I'm alot more into the "slow and go" pace to see whats along the way as I travel here in central Florida.
As Brits, do you find it strange that so many motorcycles sold in America have or had carburettors until quite recently whereas carburettor bikes are generally pre 2000 here? European models of the same bike here have fuel injection but the American spec bike (same year) sold with carburettor(s) 🏴 🏴 🇮🇪 🏴
Each cyl looks like a 250cc single. I looked at those when they were selling them here at a local shop. Seemed decently built. Looks heavy as heck, gonna be a real turd of a performer I'd reckon. Hyosung is a HUGE company. There are plenty of parts.
Joe, Do you know that Harbor Freight sells aluimium Welding rods that You use a LP torch to weld with. Ive seen them in use and they work great. God Bless
Hyosung is Korean. They weren't bad bikes. Hyosung is a huge conglomerate that makes all sort of industrial stuff. The most common Hyosung thing you probably run in to in your day to day life is Hyosung ATMs.
Pump failed, letting gas into the cylinders though the vacume line, which hydrolocked it. Owner tried to start it, and then the woodruf key broke because of the hydrolock.
Japanese carbs = probably JIS screws = Philips screwdriver will strip out the head. If not already aware and you're tinkering with Japanese motorcycles grab yourself a JIS screwdriver set [small price to pay for better results].
I’ve never worked on one of these bikes but I’ve tangled with a few of those little off brand Chinese 4 wheelers before. The biggest problem is finding parts for them if something is actually broken but most of the time it’s just a dirty carb or bad wiring that sidelines them. Their power and overall quality is never gonna impress anyone that has rode Hondas or Yamahas and they’re not worth a lot but if you can get them dirt cheap like this they can be fun little machines without having to spend name brand money. Nice grab Joe! 👍
Everybody's saying "wow 150 bucks" but like you Joe, everyone thought it was Chinese junk. You took the risk , you won the prize. Looks very similar to the Suzuki 250 Virago, so similar I would call it a clone.This should make sourcing parts easier. A nice cheap street cruiser.
hyosung build great budget bikes, its south korean, not chinese. hyosung was building suzuki bikes in license for decades before they startet their own bikes, so they have 60 years of experience. i had a st7 for many years, its a great bike.
Chinese bikes tend to suffer from poor electrics and switch gear problems, often just down to the quality of components. The engines tend to be pretty robust and reliable. By sorting out these problems, which is not difficult you can end up with a good, usable and reliable bike at a modest cost. Just my experience from Chinese based bikes.
I do know very well that this particular brand is not Chinese. Many people assume that all motorcycle brands from Asia are Chinese manufacturers, which of cause they are not. What I was aiming to say was not all these bikes are terrible, they just tend to require a bit more maintenance than say Japanese motorcycles. Kind Regards👍
For what it is…….i don’t hate it! I live a mile out of town in the country and i only have a 1.5 mile drive to work so I have been looking for a little virago 250 or something terribly small and fuel efficient to putz back and forth to work. I’d have given him $150 for it in a heartbeat 👍
@@jayjudd6518 not to sound arrogant, but yes I’d have figured that out. I fix old stuff up like Joe, just not on the scale he does. It’s a side job/fun hobby for me I guess, I like haggling with people to get the best price and figuring out why they won’t run. I don’t drink or date anymore so a guys gotta do something with his time u know! 🤣
I have a question maybe you can help me out I have a 2004 Yamaha v Star 1100 when I’m at quarter throttle it runs extremely well. But when I want to rev it from quarter throttle to a full throttle, the engine loses most of its power but revs up just fine. Then after a couple seconds it seems to gain power again and is fine. Under a quater throttle it runs perfectly but it almost seems like it’s loses power at full throttle for a bit.
Clutch might be slipping/worn clutch discs.. If you haven't had any carb or fuel issues & it revs up just fine in Neutral without any sputtering. It might be the clutch. Test: While going 25- 30mph in 2nd gear try shifting straight to 5th (or 6th) and give it gas. If the rpms go way up, without picking up any speed and the problem seems even worse. Than when normal shifting. It's most likely a slipping clutch.
Chrome…??? Most of these had Chrome plated plastic….! But $150.00….! Hell Yeah All Day Long…..! For that kind of money …, it would be great for experimentation….👍🏻 I would probably try to put a , 670 cc Predator in it , with a CVTECH Torque converter…🤔👀
$150 bucks LOL... You can't buy anything for 150 bucks. Sure it's Chinesium, but it's not bad looking and it's in pretty good condition. Most people wouldn't know what it is when it's going down the road at 50 mph.
Unbelievable! I can't believe you were able to pick this cool bike up for $150! I dig these little Hyosung Cruisers. 2 tons of fun on a lazy Saturday! This is a case of big time talent... really paying off. Congrats... on the talent... and the bike! Awesome stuff.
What a steal i will give you $300 for it. What kind of idiot knocks a hole in a Mikuni carb ? I AM CONSTANTLY AMAZED BY HOW LONG HE CAN CRANK AN UNRESPONSIVE MOTOR WITHOUT TRYING TO FIND OUT WHY ?
hyosung is NOT chinese they are KOREAN .so dont call it chinese anymore they are actually part of the suzuki family not a copy.....infact hyosung made engines under licence for suzuki...
Hyosung is South Korean, and they are utter rubbish, if you stack it good luck finding ANY parts, Ive had several ( unfortunitly) and while I found the gt650 interesting it was just utter crap compared to a honda that was 10 years older
Joe, the carb mixture screws might be under those "Welch plugs", near/under/behind the main jet area, pointing toward the venturi's, that flat area that's brass colored, surface level. If I'm right, you have to carefully "drill out" the Welch plugs being super careful to NOT drill too deep and don't go past the Welch plug area.....My Honda XR650L had Welch plugs covering the mixture, part of the smog laws, they don't want us making the mixture richer... Rich in California
Hey mate, you did your homework wrong. hyosung is not chinese brand, it is korean, you know, like hyundai, daewoo, and samsung. But lot of who dont know this brend recognises it as chinese. I owned one of these back in the early 2000'. I'm not jokeing it was good relaible bike, i put lot of kilomters in it.
I know it’s the internet. But your very first clue was the imbalanced compression. In no world is a 35 psi good. Then the first pulse back up be the carb I knew what it was. Because I had just done a Polaris ATV that had the exact symptoms. And it was the woodruff key. Loctite makes a compound that is just for preventing movement. When repairing you really need to make sure the taper on the crank to be clean so that the flywheel and crank surfaces have as much surface contact as possible. Then absolutely ensure you get every ounce of torque on that flywheel fastener as possible. Maybe add a foot one or two. Small amount of movement and rough running or backfiring engines can cause this. Single cylinder and V twins are the most common engines.
What is ironic is that $150 is what was most likely paid for this bike originally when it was new and then marked up to $4,000 by the U.S. company which sold it. Welcome to out capitalism/communist business model.
Pretty sure that's a Yamaha Virago 250 clone engine. I don't have any real experience with the Chinese-Japanese knock offs, but I have heard that in many cases, parts are inter-changable. Guess if you're gonna copy, may as well go all the way. Haha!
I served a year in S. Korea in the Army from 1989-90 what I learned while there is that Korea has a long history making OEM parts for Japanese vehicles. For example Daewoo builds Suzuki cars, KIA made Mitsubishi parts plus built copies of Mitsubishi vehicles with the KIA name for the Korean market. Today S. Korea manufacturers most of the compact tractors being sold by many names, another example is Doosan heavy equipment, it was imported through Bobcat and has become very popular in the construction field, as well as consumer brands such as Samsung and LG. Korea is a formidable manufacturing Country of quality goods.
I sold these through my dealership 15 years ago. Nice peppy v-twin, they sold a standard sport, sport, and cruiser with the same engine. Nice find on the woodruff key. The fuel pumps were known to fail over time. Parts can still be sourced from South Korea, the company is still in business.
150 bucks, people spend more on Amazon in 30 seconds than 150 bucks. Nice purchase Joe!! How’s Vinnie!! Great Video Thank You 🙏
Korean made since the 70s with some having suzuki sourced engines.
Mustie 1 pointed that out about his one a few months ago
Love watching your motorcycle videos. Your knowledge, patience and ability to troubleshoot is amazing. Thanks for sharing, great work!
Hahah I just finished rebuilding a Hyosung ez100 moped, nearly everything on it was a copy of a Suzuki address, once I worked out what it was a copy of parts became so much easier to source
Did you find that Suzuki parts actually fit?
I can't believe he got it for 150 bucks.
Unbelievably good deal.
There's lots scrapped with water in the tank
Maybe my eyes are playing tricks on me, but that bike looks Huge to have only a 250cc engine in it.
I thought the same thing.
Big cylinders for a 250.
That’s why they top out at 70 mph even with 2 cylinders
Take a look at the Chinese made equivalents. Their engines can be even smaller.
If it were mine I'd strip all the flash tat off it, paint it black and turn it into a 'bobber'.
Honda had a twin 250cc forget the model
You should consider a lift table to make your life easier.
Essential for working on bikes, James Condon the generator man, uses one to lift his generators
When we don't hear the top names in motorcycles, then we always think it's Chinese. Good thing you spotted those mikuni carburetors 👍
And a free Spark Pug Tester for you purchase. lol
so technically Bike cost 145.99!
South Korea, not China. Different countries, different people.
later in the video I found out it was made in South Korea
I think it’s just a general term. When someone says something is made in china it might not actually be made in china, but it might as well be lol because it’s just as poorly made. Anything that comes out of South America is usually crap (besides Japan of course)
Well it def wouldn't been north Korea..lol
No they're not. Same thing.
watch the whole video
It's Korean and the engine design should be licensed from Suzuki.
nothing in comon with the suzuki engine - this is only a 250 - they also have an 125 v-twin and of course the 650 which many thinks is the same as the suzuki - it isnt - but the gt model dooes look a lot like the original sv 650...... Owned the gt version with this engine - nice little engine..
What he said.
Definitely Korean. I'm here in Korea.
I'm willing to bet Koreans watching this video aren't happy campers😅😂
Bikes made in China would have fallen apart before you got them home!
@@csigouin1I did 3 tours in Korea.
It's a Mikuni 14-224 dual square fuel pump. On Amazon for $32
Even if its a wall hanger that thing is sweet.
Have had a lot of them here in the UK, they are the better one of the Junk Brands. Some folks love them
What about the broken tooth off the gear ???
fuck it
I was wondering about that myself. Did he just put it back on like that?
@@stkyfngrszmooth I think he did , but the gear is just for the starter so a missing tooth wont be too much of a problem.
@@mark3863 It won't help. Why not just order the part and be done with it?
@@stkyfngrszmoothparts are unobtanium
Are you fuckin kidding me? I've been telling him for months to get a spark tester, and now that he got one for free and in place, he takes it out 😂
He has a 4 plug one that sits on a tabletop.
It's not the same thing. The "spark tester", not "spark-plug tester" is made to simply put inline so you can see if the bike has spark without pulling the spark-plugs out. It's a diagnostic tool to see if the motorcycle is producing spark, not the spark-plug. 👍🏼
You would never have bent a valve as the flywheel does not determine camshaft timing The flywheel only provides the timing for the spark
How in the hell did you get that for 150 bucks
Metric cruisers are very unpopular right now, plus that one is not even Japanese. Probably a fine machine, just very out of style right now.
@@jameshisself7375 I like that old school cruiser look, and 250cc is enough for a rider to enjoy for lite riding.
@@billycarpenter4740True. When I was a kid my brother's very first street bike was a Honda Rebel 250. It was totally gutless, but it provided a smooth beautiful ride until he hit a dog on it. 🤷🏻♂️
They are junk and you can't get parts for them that's why people get them gone cheap when they mess up.
@@stkyfngrszmooth As a kid back in the early 1970's I had both a Suzuki TS 100 and A Suzuki TS 250 . Both were good street/dirt bikes for getting around locally, the 250cc being enough to get up to highway speeds and driving out for hours. Maybe not 750cc bikes but enough to have fun with and ocassionally carrying a buddy along. With age now I'm alot more into the "slow and go" pace to see whats along the way as I travel here in central Florida.
You got the deal of the century...enjoy this bike
It's definitely much better than a Chinese make, it would be really rusty on the frame. 👍
Great video Joe watching from Edinburgh Scotland UK 🇬🇧
Watching from Stirling 🏴
As Brits, do you find it strange that so many motorcycles sold in America have or had carburettors until quite recently whereas carburettor bikes are generally pre 2000 here? European models of the same bike here have fuel injection but the American spec bike (same year) sold with carburettor(s) 🏴 🏴 🇮🇪 🏴
@@CawKeemy 2014 250cc chinese supermoto still has a carb lol 🏴
@@rintin1874 am from Glasgow 👌
Perth. I should be out riding my bike in the sunshine, not lying about the house looking at TH-cam.
Those spark testers work great. Bought a pack of 6 off ebay for cheap. They are very convenient!
Dang. 200 bucks and you still got him down 50 more lLOL
I got put on one of those when I took the MSF course; I hated the forward controls...
It’s pronounced Ah Gee La. Eagle in Spanish. Pretty sweet bike. I’m actually jealous. Lol
Each cyl looks like a 250cc single. I looked at those when they were selling them here at a local shop. Seemed decently built.
Looks heavy as heck, gonna be a real turd of a performer I'd reckon. Hyosung is a HUGE company. There are plenty of parts.
Joe, Do you know that Harbor Freight sells aluimium Welding rods that You use a LP torch to weld with. Ive seen them in use and they work great. God Bless
Thats a steal
Is the broken gear not a problem for control?That piece of metal is not missing?
Ya I don't know why you wouldn't replace that gear. That's gonna be a problem
@@joemomma9177Nah, 2nd hand one easy external job.
No, it's a reluctant wheel. It's tells the coil when to fire.
It's the starter gear so it should be ok for a few
@@bbroken1 as the chain goes around that gear, it is actually using about 4 teeth...so 1 tooth missing should not be a problem
Just got a 2007 Honda 450 but it has a bog any tips would be appreciated
Clean the carbs.
150$ where are these deals at jeeez lol
These are the buys where being a hustler really pays off.
Hyosung is Korean. They weren't bad bikes. Hyosung is a huge conglomerate that makes all sort of industrial stuff. The most common Hyosung thing you probably run in to in your day to day life is Hyosung ATMs.
Looks like someone pryed on carb with screwdriver. Oops!!
Pump failed, letting gas into the cylinders though the vacume line, which hydrolocked it. Owner tried to start it, and then the woodruf key broke because of the hydrolock.
That's most logical idea what happened kicked back broke gear and key.
Japanese carbs = probably JIS screws = Philips screwdriver will strip out the head. If not already aware and you're tinkering with Japanese motorcycles grab yourself a JIS screwdriver set [small price to pay for better results].
Great video Joe! Your a very good mechanic!!!
I’m surprised the starter motor didn’t burn out!!!
Noice
it looks like a kawasaki vulcan fender that's crazy.
I’ve never worked on one of these bikes but I’ve tangled with a few of those little off brand Chinese 4 wheelers before. The biggest problem is finding parts for them if something is actually broken but most of the time it’s just a dirty carb or bad wiring that sidelines them. Their power and overall quality is never gonna impress anyone that has rode Hondas or Yamahas and they’re not worth a lot but if you can get them dirt cheap like this they can be fun little machines without having to spend name brand money. Nice grab Joe! 👍
Agreed!
Carbs made out of chinesium… easily breakable
Good job Joe and south Korea
Hyosung Corporation is a South Korean industrial.
a very lucky buy, minimal problems...!
That bike is what they call a wanted be Harley Davidson lol 😆
"wanted be"? did you go to school?
Fuel pumps available in Australia on EBay for around $30AUD, so would be cheaper in the US.
Evidently they haven’t seen that from this perspective
It's either a running bike or a garage ornament, yes, value depends on whether or not it runs
Strip all that extra weight off and make it a bobber rat rod.
it's only 250cc, if there's a big bore kit for it? get that first
Everybody's saying "wow 150 bucks" but like you Joe, everyone thought it was Chinese junk. You took the risk , you won the prize. Looks very similar to the Suzuki 250 Virago, so similar I would call it a clone.This should make sourcing parts easier. A nice cheap street cruiser.
I WILL say that as far as ELECTRIC-SCOOTERs go, Korean is definitely the best “build quality” so I have hope
hyosung build great budget bikes, its south korean, not chinese. hyosung was building suzuki bikes in license for decades before they startet their own bikes, so they have 60 years of experience. i had a st7 for many years, its a great bike.
Great video I enjoy watching your videos just great what bargain that bike was keep doing what you’re doing 👍
Talk about luck. That is a fine looking bike. If I were you I would have went and bought a lottery ticket. after getting that. Lol
Chinese bikes tend to suffer from poor electrics and switch gear problems, often just down to the quality of components. The engines tend to be pretty robust and reliable. By sorting out these problems, which is not difficult you can end up with a good, usable and reliable bike at a modest cost. Just my experience from Chinese based bikes.
How come you don't know it's not chinese? South Korea, not China. Different countries, different people.
I do know very well that this particular brand is not Chinese. Many people assume that all motorcycle brands from Asia are Chinese manufacturers, which of cause they are not. What I was aiming to say was not all these bikes are terrible, they just tend to require a bit more maintenance than say Japanese motorcycles.
Kind Regards👍
@@lesoram6236 with a Japanese Suzuki designed engine and suzuki parts
noice
Happy Days Joe Has Posted 🔥🔥🔥
I'm getting one of the hyosung gv650s for my first bike in a month or so and there Korean and made engines for Suzuki
Fixes clutch switch but cranks the thing to death without pulling in the clutch...
Detective Joe Sherlock strikes again Great work mate and a really great Bargain 👍
This is a quality bike compared to the chinese junk.
Gas in oil . Then proceeds to crank for a minute straight lol
Not a genius as my grand daughter would say.
For what it is…….i don’t hate it! I live a mile out of town in the country and i only have a 1.5 mile drive to work so I have been looking for a little virago 250 or something terribly small and fuel efficient to putz back and forth to work. I’d have given him $150 for it in a heartbeat 👍
Could you have fixed it? Joe is a very good teacher.😊😊
@@jayjudd6518 not to sound arrogant, but yes I’d have figured that out. I fix old stuff up like Joe, just not on the scale he does. It’s a side job/fun hobby for me I guess, I like haggling with people to get the best price and figuring out why they won’t run. I don’t drink or date anymore so a guys gotta do something with his time u know! 🤣
Bad solenoid. Hard to say, have fun, good luck.
The “R” stands for “Ruh-Row!”😊
Sure is a pretty bike, thanks for your time.
Thats a really nice bike for a 250cc
Was it just thrown back together??
South Korean bike, Yep!!
Driving a south korean made car while watching this video. 😂 Car hasnt given me a moments trouble
Did you change the oil filter???
I have a question maybe you can help me out I have a 2004 Yamaha v Star 1100 when I’m at quarter throttle it runs extremely well. But when I want to rev it from quarter throttle to a full throttle, the engine loses most of its power but revs up just fine. Then after a couple seconds it seems to gain power again and is fine. Under a quater throttle it runs perfectly but it almost seems like it’s loses power at full throttle for a bit.
Fuel problems
Alot don't start with stand down and hold clutch in
Do you need full throttle?
Clutch might be slipping/worn clutch discs..
If you haven't had any carb or fuel issues & it revs up just fine in Neutral without any sputtering. It might be the clutch.
Test: While going 25- 30mph in 2nd gear try shifting straight to 5th (or 6th) and give it gas. If the rpms go way up, without picking up any speed and the problem seems even worse. Than when normal shifting.
It's most likely a slipping clutch.
@@tracktorred7570 always
Are you afraid of starting fluid
$150.00 You robed the dude.
the engine is from yamaha
Agreed. Clone if yamaha vstar 250
So are Harley motorcycles are made in China, India and Japan assembled in U.S.
Yes,most H.D parts are made in China .
That darn thing is ugly
WAY TO GO JOE WE'RE ENJOYING YOUR SHOW!
🎉
Chrome…???
Most of these had Chrome plated plastic….!
But $150.00….!
Hell Yeah All Day Long…..!
For that kind of money …, it would be great for experimentation….👍🏻
I would probably try to put a , 670 cc Predator in it , with a CVTECH Torque converter…🤔👀
the best i know❤❤
$150 bucks LOL... You can't buy anything for 150 bucks. Sure it's Chinesium, but it's not bad looking
and it's in pretty good condition.
Most people wouldn't know what it is when it's going down the road at 50 mph.
Unbelievable! I can't believe you were able to pick this cool bike up for $150! I dig these little Hyosung Cruisers. 2 tons of fun on a lazy Saturday! This is a case of big time talent... really paying off. Congrats... on the talent... and the bike! Awesome stuff.
What a steal i will give you $300 for it. What kind of idiot knocks a hole in a Mikuni carb ? I AM CONSTANTLY AMAZED BY HOW LONG HE CAN CRANK AN UNRESPONSIVE MOTOR WITHOUT TRYING TO FIND OUT WHY ?
Do you need jis screwdrivers? They’re different than Phillips. You’ll be able to move those screws much easier.
hyosung is NOT chinese they are KOREAN .so dont call it chinese anymore they are actually part of the suzuki family not a copy.....infact hyosung made engines under licence for suzuki...
Ow0 oil
Hyosung is South Korean, and they are utter rubbish, if you stack it good luck finding ANY parts, Ive had several ( unfortunitly) and while I found the gt650 interesting it was just utter crap compared to a honda that was 10 years older
Joe, the carb mixture screws might be under those "Welch plugs", near/under/behind the main jet area, pointing toward the venturi's, that flat area that's brass colored, surface level. If I'm right, you have to carefully "drill out" the Welch plugs being super careful to NOT drill too deep and don't go past the Welch plug area.....My Honda XR650L had Welch plugs covering the mixture, part of the smog laws, they don't want us making the mixture richer... Rich in California
Just wondering. Do you ever check the plug gap before installing them?
Excellent repair mate - cheers from Australia! That hole in the carby was probably from someone having issues trying to lever out the airbox.
You have great patience with difficult situations. Just the person to take on complicated tasks.
Hey mate, you did your homework wrong. hyosung is not chinese brand, it is korean, you know, like hyundai, daewoo, and samsung. But lot of who dont know this brend recognises it as chinese. I owned one of these back in the early 2000'. I'm not jokeing it was good relaible bike, i put lot of kilomters in it.
JOE - WEAR GLOVES MAN!!! Skin, prostate, liver, and stomach cancer can be prevented by just wearing gloves. Costco 100 gloves for $10.00.
I know it’s the internet. But your very first clue was the imbalanced compression. In no world is a 35 psi good. Then the first pulse back up be the carb I knew what it was. Because I had just done a Polaris ATV that had the exact symptoms. And it was the woodruff key.
Loctite makes a compound that is just for preventing movement. When repairing you really need to make sure the taper on the crank to be clean so that the flywheel and crank surfaces have as much surface contact as possible. Then absolutely ensure you get every ounce of torque on that flywheel fastener as possible. Maybe add a foot one or two. Small amount of movement and rough running or backfiring engines can cause this. Single cylinder and V twins are the most common engines.
Joe, Suzuki makes a v-twin 250, the Suzuki RGV250, that whole engine might be made by Suzuki, minus those cases with the Korea company name on them...
What is ironic is that $150 is what was most likely paid for this bike originally when it was new and then marked up to $4,000 by the U.S. company which sold it. Welcome to out capitalism/communist business model.
Pretty sure that's a Yamaha Virago 250 clone engine. I don't have any real experience with the Chinese-Japanese knock offs, but I have heard that in many cases, parts are inter-changable. Guess if you're gonna copy, may as well go all the way. Haha!
I served a year in S. Korea in the Army from 1989-90 what I learned while there is that Korea has a long history making OEM parts for Japanese vehicles. For example Daewoo builds Suzuki cars, KIA made Mitsubishi parts plus built copies of Mitsubishi vehicles with the KIA name for the Korean market. Today S. Korea manufacturers most of the compact tractors being sold by many names, another example is Doosan heavy equipment, it was imported through Bobcat and has become very popular in the construction field, as well as consumer brands such as Samsung and LG. Korea is a formidable manufacturing Country of quality goods.
I sold these through my dealership 15 years ago. Nice peppy v-twin, they sold a standard sport, sport, and cruiser with the same engine. Nice find on the woodruff key. The fuel pumps were known to fail over time. Parts can still be sourced from South Korea, the company is still in business.
The fuel pupm diaphragm is not worn out, it's deteriorated from ethamol. Expect to replace all seals in the fuel system
I worked on a gy6 that was hard to start and backfired out the carb because the valves weren't adjusted properly also! But that engine isn't DOHC.