I’ve had mine for a few weeks now . Very solid engine . It’s on my mud boat . Paired with a mudskipper twister on a 1432 jon boat running 33mph bone stock !
I purchased the 500cc for my boys go-kart. I think it was a 212 predator that was on it. I had to modify this small go-kart a lot to make the Duromax fit but I think it will work. I've never done any of this before. This has definitely been an experience. The go-kart is only 150 pounds.
I wanna say the cones on the airbox are cyclone traps that help spin a bunch of the large dirt out of the air stream....Honda has cyclone filters on some of their GX engines. I can't wait to see this big boss hoss rip!
The cups in the air filter are water traps.The holes are drains.That's a pretty good idea for all weather uses.It's pretty cool that Duromax has been producing so many good designs for us...uhhh,...for many normal and industrial apps ;)
Bike guy, you could be right, however I believe they are more specifically used to help prevent the filter from being clogged with larger particles too quickly (lengthening the usable service limits). Dusty sandy conditions can play hell on small engines, especially at construction sites. And they run just fine in the rain using the standard air filter cover found on Honda & clone type engines. Just my unsolicited 5 cents! 🍻
Those cylinders on the intake are like something that is on my Duramax. On my Duramax it catches water and debris before reaching my filter, and falls out the bottom. Can’t wait to see the power it makes!
I enjoy the channel very much, well done to you guys. One thing I want to touch on is the exhaust valve sizes, exhaust valves are smaller because the cylinder is under pressure when the exhaust valve opens, so the pressure differential is very large compared to what occurs during the intake stroke. Because of this much larger pressure differential you don't need as large of a valve to expel the gasses, the gasses are more readily forced out. Cheers
the air intakes are to "spin" dust out of the intake air. its a features used in a lot of 4x4 air intake systems to reduce load and extend air filter life
Don’t feel anything you said is pointless ! Someone will always need that info. Thanks for all the videos, we all 💕 them ! What have you found to be the best carb for the buck $ I’m older and the mukuni clones have the hi/low mix on the bottom😢 It’s just not easy for me? Any info on this will be so appreciated, I’ll tell ten people how cool you are 👍✌️ Wife is awesomely smart! I don’t think 25% people know about exhausting! Great job guys
This is long, get a cup of coffee, a honeybun, a beer, whatever. I’m not positive about this, however the purpose of the oversized air box with the three intake ports, may have a two fold purpose. The first, the three small intake ports, as DuroMax doesn’t know that exact end use of their engines, may be large debris excluders. Grass clippings, large wood chipper dust, etc. and they look as if they’re molded to create three small swirl chambers that could have something to do with dust separation. Secondly, air intake noise can be loud. Automotive engine engineers spend countless hours changing the note/sound of intake air for various reasons. In automotive and light trucks, many times it’s for a more throaty sound. Who knows what you’re running, as long as it sounds tough. Also a deeper note has a longer wave length. Longer sound wave lengths are easier on the ear that a than a short wave length, higher note. Deeper notes can be achieved with a large air box with internal baffles. Maybe the round conical chambers also have something to do with the note. To me, it would be worth a call to your DuroMax supplier. The more you know… Here’s a tip those with large loud compressors in their shops. In a shop I owned, I completely changed, made much quieter, a large twin V two stage compressor by installing, of all things a 200 series Volvo rear muffler on the intake. The first stage inlet, where the original filter was mounted was the same diameter as the muffler inlet and outlet. I welded some brackets to securely hold the muffler to the top of the belt guard, and ran a length of 2” Gates fuel fill hose between the two. Then installed the original air filter on the other end of the muffler. It made a huge difference! You could cary on a normal conversation, without raising voices right next to the compressor. Another noise reducer is to mount the compressor, on large rubber motor mounts. (Again with the Volvo aftermarket parts) I used four right side (large) mounts with studs centered on each side. Mark where the leg mounting holes are on the floor, and drill holes into the concrete deep enough for the studs. Hopefully you know what to do with the other side of the mount. In the end, the decibels were greatly reduced with the intake muffler, and rouge vibration noise from the legs being on the floor was eliminated. It also kept the compressor from wandering out of its assigned work space. Hope there was some good in all of my old man ramblings. Really like your videos! Bart
So those cones on the intake look really similar to the cyclones you see on vacuum cleaners and the like. I think air is primarily supposed to come in the side, then water and debris gets flung out and falls down through the holes in the middle. Actually sort of clever if they don't just get immediately clogged.
That's quite the thumper! I (Yamaha FJ1200) used to go on day trips with my neighbor (1200 Gold Wing) and his wife who rode a Suzuki 600 single with a straight pipe. She kept up pretty well just cruising, but I would occasionally have to get a few miles ahead because it was stupidly loud and blew fireballs out the exhaust on deceleration. I guess what I'm saying is, a 500cc seems a bit large for a "mini-bike", but if we could get it to turn 12,000 RPM it could be fun on a go-kart. lol ;)
Man I love big displacement singles. I can't wait to watch your testing on that thing. I just ordered a 440 now I want the 500. Also I wonder if the intake pocket things spin air to clear out dust. We had something like that on generators
Great videos, I wonder if the generator with the 500cc has the hemi, if valve covers the same then most likely. I'd say next year they'll add bearings. I wonder if the harbor freight 13000 gen has the hemi. Merry Christmas and new year
Who do i need to talk to to get the usual aftermarket stuff built for this? Its been two years now, people seem to like them. Why havent i seen billet rods with bearings & flat top pistons yet?
Love all your vid. It would be very nice if you could also make a dyno. Also if you could give any ideas how or what parts to make to give more power performance. I will use a Tazawa monster X 500cc in Thailand which I believe is the same. Kind regards from Phuket.
That weird intake is similar to a Dyson vacuum or a gold refinement machine, it sucks air in a circle and up allowing other heavier particles to fall out the center like a reverse tornado.
@RedBeardsGarage how bout a vox or should I just 420 or 440 it I wish u did a vid on the duro420vs the 440 and the difference from the pull start or estart which is mo butter
Im thinking about build a Liberty cart 2 seater and will watching for more info on this motor. If the after market starts producing rods ect i might have to check this motor out. Has a beefy connecting rod as it is.
I'm very interested in the 500. Please find out how much power it can make. It just became a candidate for something special I want to build. If seems like doubling the rated power isn't asking much for most utility engines and a reliable 40 HP will be enough for me.
Need to replace a blown GX270 engine in a go-kart. Would this bolt in? I have plenty of space. More concerned about bolt patterns. Thank you in advance.
I agree that torque number doesn’t make sense. I think the 459 predator is around 24.5 ft-lbs I can’t imagine a engine that is similar and 10% larger making significantly less.
Greatly appreciated, Mr. Red Beard, I do have a question for tall. Would you say it is without a fuel tank and filter if anyone has this information I would appreciate it.
I've been anticipating one of these for my Ghost Face Killahwatt build. Should I just get a 440? I mean two ponies and I plan on a 34mmMikuni and a torque tube header.
It's a typo or you overlooked something. It is 22.87 Nm (Newton Meters) 22.87 ÷ 0.73756214927727 = 31.00755647833893 ft. lbs. but it should be stock with exhaust and intake 25 hp + 37.5 ft. lbs. and 500cc engines range from 31 to 56 lb. ft. of torque. This is capable of up to 56 ft. lbs. and 41.3114 hp with heavy modification!
Liked your video. I have duromax XP13000EH generator 500CC 20HP engine that someone brought to me to see why it was backfiring, I have found the rocker valve pin ear broken on intake side, I'm looking for another head for this generator where can a person find parts for these engines. I've looked around on internet and only found, only in United Kingdom and it is on back order. I'm wondering is there any parts here in USA that sells parts for these Duromax. Thanks
I would definitely put this on a kart, not so much on a minibike.. not my minibike anyway, this wouldn't fit unless i setup a fuel tank to mount on the upper frame.
looks like this beast shares nothing with the 390/420/440 for aprts, looks like the 500 head wont fit on the 390/420/440 either, all we can do is a stage 1 for now, hope to see aftermarket parts for this beast soon.
@@RedBeardsGarage there’s a guy who did a tear down on one here on TH-cam , can’t recall the channel but it’s a much larger head so it will not fit the 440 platform . Everything about the 500 is larger , really the only thing useable from another bigblock are the carbs . I plan on cutting out my own exhaust flange and doing a 30or 32 mikuni since the stock carb is 28mm .
I need to line you out on what makes a hemispherical designed head. One of the main things is the valves. Your intake valves are on the intake, side of the head and your exhaust valves are on the exhaust side of your head. The piston is supposed to be a domed piston, and the spark plug is supposed to be in the center of the head.
The splayed out valves on this thing do in fact look like a hemispherical design. Edit: after seeing him pull the head, its a hemispherical for sure. Just a fairly flat one. The plug is offset a little to clear the valves, and they have used a dished piston to reduce the compression ratio.
Ted, these are lawnmower engines, not muscle car engines. The term hemi is used to describe the valve arrangement, where the valves are not parallel to each other on a flat plane, the valve stems are making a V shape if you will, which angles the valve seats to allow a semi-round or hemispheric combustion chamber. Piston design is irrelevant in this scenario. 🍻
Sorry, that's not why. Actually, the exhaust port is always smaller than the intake because hot air flows twice as fast as cold air. For example, look at the air vents on a home without central air conditioning, small vents. Homes with air conditioning need larger vents about twice the volume. The reason hot air flows twice as fast is because the molecules are moving faster and it is less dense.
I’ve had mine for a few weeks now . Very solid engine . It’s on my mud boat . Paired with a mudskipper twister on a 1432 jon boat running 33mph bone stock !
I’m mad I just bought a 459cc and this came out three days later
Nice! I was thinking about doing the same setup on my 1436. What prop are you running?
@@DBD801 sps T76
@@Minibikes_of_Augusta did you have to get the adapter kit from mudskipper to run that?
@@DBD801 yes
Shout out to the camera genius, you film at Hollywood level. Every time I watch redbeard, you two are like family to me.
Would love to see a build on this engine. Also would like to see how it compares with the 440 on the dyno.
I cannot wait to see the test videos on this. Should be an absolute unit. Also cannot wait to see what kind of aftermarket support will be available.
I purchased the 500cc for my boys go-kart. I think it was a 212 predator that was on it. I had to modify this small go-kart a lot to make the Duromax fit but I think it will work. I've never done any of this before. This has definitely been an experience. The go-kart is only 150 pounds.
How did it turn out?
I wanna say the cones on the airbox are cyclone traps that help spin a bunch of the large dirt out of the air stream....Honda has cyclone filters on some of their GX engines. I can't wait to see this big boss hoss rip!
You are correct. I've seen similar setups on military vehicles
The cups in the air filter are water traps.The holes are drains.That's a pretty good idea for all weather uses.It's pretty cool that Duromax has been producing so many good designs for us...uhhh,...for many normal and industrial apps ;)
Bike guy, you could be right, however I believe they are more specifically used to help prevent the filter from being clogged with larger particles too quickly (lengthening the usable service limits). Dusty sandy conditions can play hell on small engines, especially at construction sites. And they run just fine in the rain using the standard air filter cover found on Honda & clone type engines. Just my unsolicited 5 cents! 🍻
(Cyclonic pre-filtering similar to what's used on those fancy vacuum cleaners, lol)
Those cylinders on the intake are like something that is on my Duramax. On my Duramax it catches water and debris before reaching my filter, and falls out the bottom. Can’t wait to see the power it makes!
Dura? or Duro?
Truck engine or cart engine?
@chadmills5400 snorkel that baby. Put the air intake as high as possible and blame redneck innovations.
I enjoy the channel very much, well done to you guys.
One thing I want to touch on is the exhaust valve sizes, exhaust valves are smaller because the cylinder is under pressure when the exhaust valve opens, so the pressure differential is very large compared to what occurs during the intake stroke. Because of this much larger pressure differential you don't need as large of a valve to expel the gasses, the gasses are more readily forced out. Cheers
@@kevinwest3689 I can’t think of any cylinder head that has an exhaust valve bigger than an intake valve, I think you might have something confused.
the air intakes are to "spin" dust out of the intake air. its a features used in a lot of 4x4 air intake systems to reduce load and extend air filter life
Don’t feel anything you said is pointless ! Someone will always need that info.
Thanks for all the videos, we all 💕 them !
What have you found to be the best carb for the buck $
I’m older and the mukuni clones have the hi/low mix on the bottom😢
It’s just not easy for me?
Any info on this will be so appreciated, I’ll tell ten people how cool you are 👍✌️
Wife is awesomely smart!
I don’t think 25% people know about exhausting!
Great job guys
Those are cyclone separators on the intake. As the dirt is spun out of the air it falls out the holes on the white cones.
Great engine, use it for my generator. MANY MANY MANY hours on it without issue. Just regular oil change.
Man I’m pumped about this one and I love when you do engine builds! Thank you so much 🦾
Yupp. Water/Particle catch turbines. These are standard on concrete saws
I learn so much from this channel
This is long, get a cup of coffee, a honeybun, a beer, whatever.
I’m not positive about this, however the purpose of the oversized air box with the three intake ports, may have a two fold purpose. The first, the three small intake ports, as DuroMax doesn’t know that exact end use of their engines, may be large debris excluders. Grass clippings, large wood chipper dust, etc. and they look as if they’re molded to create three small swirl chambers that could have something to do with dust separation.
Secondly, air intake noise can be loud. Automotive engine engineers spend countless hours changing the note/sound of intake air for various reasons. In automotive and light trucks, many times it’s for a more throaty sound. Who knows what you’re running, as long as it sounds tough. Also a deeper note has a longer wave length. Longer sound wave lengths are easier on the ear that a than a short wave length, higher note. Deeper notes can be achieved with a large air box with internal baffles. Maybe the round conical chambers also have something to do with the note. To me, it would be worth a call to your DuroMax supplier. The more you know…
Here’s a tip those with large loud compressors in their shops.
In a shop I owned, I completely changed, made much quieter, a large twin V two stage compressor by installing, of all things a 200 series Volvo rear muffler on the intake. The first stage inlet, where the original filter was mounted was the same diameter as the muffler inlet and outlet. I welded some brackets to securely hold the muffler to the top of the belt guard, and ran a length of 2” Gates fuel fill hose between the two. Then installed the original air filter on the other end of the muffler. It made a huge difference! You could cary on a normal conversation, without raising voices right next to the compressor.
Another noise reducer is to mount the compressor, on large rubber motor mounts.
(Again with the Volvo aftermarket parts) I used four right side (large) mounts with studs centered on each side. Mark where the leg mounting holes are on the floor, and drill holes into the concrete deep enough for the studs. Hopefully you know what to do with the other side of the mount.
In the end, the decibels were greatly reduced with the intake muffler, and rouge vibration noise from the legs being on the floor was eliminated. It also kept the compressor from wandering out of its assigned work space.
Hope there was some good in all of my old man ramblings.
Really like your videos!
Bart
So those cones on the intake look really similar to the cyclones you see on vacuum cleaners and the like. I think air is primarily supposed to come in the side, then water and debris gets flung out and falls down through the holes in the middle. Actually sort of clever if they don't just get immediately clogged.
Interesting. I didn’t know what in the world they could have been for.
That was my thought as well. Debris gets spun around and falls out rather than going on to plug the filter media.
Ok thank you.💯👍
More it's just like Christmas are can't wait to see that puppy up and running. ✌️💛🙏😅😅
That's quite the thumper! I (Yamaha FJ1200) used to go on day trips with my neighbor (1200 Gold Wing) and his wife who rode a Suzuki 600 single with a straight pipe. She kept up pretty well just cruising, but I would occasionally have to get a few miles ahead because it was stupidly loud and blew fireballs out the exhaust on deceleration.
I guess what I'm saying is, a 500cc seems a bit large for a "mini-bike", but if we could get it to turn 12,000 RPM it could be fun on a go-kart. lol ;)
I love the 440 I own two of them might have to try the 500 out on my next snowblower build
It looks like that intake has three cycloidal dust separators. Just another layer of filtration.
Man I love big displacement singles. I can't wait to watch your testing on that thing. I just ordered a 440 now I want the 500. Also I wonder if the intake pocket things spin air to clear out dust. We had something like that on generators
I believe it is a type of cyclonic pre-filter, 🍻
Thats a beast right out of the box......
Great review….new subscriber….enjoying hour work. Will see about one if these on a new buggy
Great videos, I wonder if the generator with the 500cc has the hemi, if valve covers the same then most likely. I'd say next year they'll add bearings. I wonder if the harbor freight 13000 gen has the hemi. Merry Christmas and new year
Who do i need to talk to to get the usual aftermarket stuff built for this?
Its been two years now, people seem to like them. Why havent i seen billet rods with bearings & flat top pistons yet?
Love all your vid. It would be very nice if you could also make a dyno. Also if you could give any ideas how or what parts to make to give more power performance. I will use a Tazawa monster X 500cc in Thailand which I believe is the same. Kind regards from Phuket.
That weird intake is similar to a Dyson vacuum or a gold refinement machine, it sucks air in a circle and up allowing other heavier particles to fall out the center like a reverse tornado.
think this could fit on a Coleman ct200 without modifying the frame?
I think it would
This is what I was thinking, my ct200 needs a big block
@RedBeardsGarage how bout a vox or should I just 420 or 440 it I wish u did a vid on the duro420vs the 440 and the difference from the pull start or estart which is mo butter
Im thinking about build a Liberty cart 2 seater and will watching for more info on this motor. If the after market starts producing rods ect i might have to check this motor out. Has a beefy connecting rod as it is.
Hope you will do a performance parts update when they become available.
I'm very interested in the 500. Please find out how much power it can make. It just became a candidate for something special I want to build. If seems like doubling the rated power isn't asking much for most utility engines and a reliable 40 HP will be enough for me.
Need to replace a blown GX270 engine in a go-kart. Would this bolt in? I have plenty of space. More concerned about bolt patterns. Thank you in advance.
Honda makes the cyclone air box. We run a gx390 on a floor saw with it.
Knowledge is power!!!
Im in the middle of a go kart built i was going 440 but i might go 500 depending how this works out for you..ready to see the outcome
I know this is late but does this have the same mounting plate as the predator 420
Does it have a cast iron connecting rod?
they make a 670cc single for their generators id like to see that come out in a standalone engine
crankshaft what size bolt for clutch?????
Anyone know if the 420 predator governor delete products work on the 500cc duramax?
Do have and low speed of that engine..?And the engine was available in the Philippines..?
Does it have a built in alternator for the electric start version?
FULL BUILD!!
I agree that torque number doesn’t make sense. I think the 459 predator is around 24.5 ft-lbs I can’t imagine a engine that is similar and 10% larger making significantly less.
I'm sure it never happens but 670 single cylinder from Duramax or something that size in a single cylinder that would be a absolute beast
You build one of these yet? Looking to see what kind of improvements you can make to this engine.
I’m thinking about buying one for my daughters go kart how fast does it go stock
Greatly appreciated, Mr. Red Beard, I do have a question for tall. Would you say it is without a fuel tank and filter if anyone has this information I would appreciate it.
It’s weird that in other videos people with the 500 CC have insert rod bearings. It’s weird that this one does not.
So do I need a clutch?
I've been anticipating one of these for my Ghost Face Killahwatt build. Should I just get a 440? I mean two ponies and I plan on a 34mmMikuni and a torque tube header.
I need one but I'm in CA so have to have someone else get it. Wonder what it would make at 6000 rpm with a cam reground and head ported
Looks like they got it so close to being awesome and just needed that rod bearing and a starter. I'm to old to be pulling cords. 😆👍👍
They do have the electric start version. We just got this one first.
It's a typo or you overlooked something. It is 22.87 Nm (Newton Meters) 22.87 ÷ 0.73756214927727 = 31.00755647833893 ft. lbs. but it should be stock with exhaust and intake 25 hp + 37.5 ft. lbs. and 500cc engines range from 31 to 56 lb. ft. of torque. This is capable of up to 56 ft. lbs. and 41.3114 hp with heavy modification!
great video,is the mount holes the same as a 13 horse power Honda ? would like to swap engines,,,
Liked your video. I have duromax XP13000EH generator 500CC 20HP engine that someone brought to me to see why it was backfiring, I have found the rocker valve pin ear broken on intake side, I'm looking for another head for this generator where can a person find parts for these engines. I've looked around on internet and only found, only in United Kingdom and it is on back order. I'm wondering is there any parts here in USA that sells parts for these Duromax. Thanks
Wonder why you dont see these on snowthrowers as much. Would really get the snow going!
how can the 440 have more torque then the 500cc on duromax website???
wondering if gx390/440 alum flywheel will fit?
I will test it in the next video. I wonder if the head will fit on a 440. That would be a nice upgrade for cheap.
according to redneck computer geek channel the 500 head wont fit on the 440, bummer
Haven't had a "jeepers" in while. 😊😊
Is it possible you can build that to the specs of 500 CC Honda? Just wondering cause I had an 85 , and it was a screamer.
Yes I am wanting to use one
I wanna see this on a mini bike 👍😎... some fella mentioned turbski 🎉 that's out of my wheel house lol
Lol hehee yeah huh 🙄
Cyclone style pre alr cleaner
Can’t figure out the market for these except big log splitters, guys trash pumps, and 8KW and up generators.
CA model intake setup
Oh Boy a Thumpin gravy bones engine 😮 ☮️
So this will be going on an 80/105 Minibike?
would this fit on a megamoto 80-105 (kinda satire kinda asking for real
Definitely interested
ANY UPDATES ON SUPERCHARGEd 440
65ftlb is a chevy small block w/aluminum heads
Awsome vid thanks
I would definitely put this on a kart, not so much on a minibike.. not my minibike anyway, this wouldn't fit unless i setup a fuel tank to mount on the upper frame.
Boonjour!Omg. you shared breathtaking sharing!
That's a pretty tight head bolt. Even my DRZ400 only has 34ft/lb as the head bolt spec.
I thought it was as well.
So nobody can tell me the crankshaft bolt size for my clutch
The fuel solenoid needs to go, I have issues with those sticking open, filling the cylinder and crankcase with gasoline.
I personally would remove it as well.
Or stick closed and you clean the carb for no reason!
looks like this beast shares nothing with the 390/420/440 for aprts, looks like the 500 head wont fit on the 390/420/440 either, all we can do is a stage 1 for now, hope to see aftermarket parts for this beast soon.
Be cool if that better flowing head would fit a 440
I'm going to try it in the next video. Stay tunned!
@@RedBeardsGarage there’s a guy who did a tear down on one here on TH-cam , can’t recall the channel but it’s a much larger head so it will not fit the 440 platform . Everything about the 500 is larger , really the only thing useable from another bigblock are the carbs .
I plan on cutting out my own exhaust flange and doing a 30or 32 mikuni since the stock carb is 28mm .
Massive head bolts=boost ready!
Tem como vende para o Brasil
Isn’t Gravy Bones powered by a 440 now? Try this on it or Gravy Bones 2.0.
Will do.
Id like to see this on gravy bones
Yea I want one
Cool videos
Has anyone added a oil cooler and extra filter to these types of engines ?drag race series is almost inevitable now come on people let's do it !👍
Would be cool in a mini bike
They just need to stick with common platform cc's. 80,125,250,500 single. 600,750,1000 twin. They made so many odd displacements.
I need to line you out on what makes a hemispherical designed head. One of the main things is the valves. Your intake valves are on the intake, side of the head and your exhaust valves are on the exhaust side of your head. The piston is supposed to be a domed piston, and the spark plug is supposed to be in the center of the head.
The splayed out valves on this thing do in fact look like a hemispherical design.
Edit: after seeing him pull the head, its a hemispherical for sure. Just a fairly flat one. The plug is offset a little to clear the valves, and they have used a dished piston to reduce the compression ratio.
Ted, these are lawnmower engines, not muscle car engines. The term hemi is used to describe the valve arrangement, where the valves are not parallel to each other on a flat plane, the valve stems are making a V shape if you will, which angles the valve seats to allow a semi-round or hemispheric combustion chamber. Piston design is irrelevant in this scenario. 🍻
Sorry, that's not why. Actually, the exhaust port is always smaller than the intake because hot air flows twice as fast as cold air. For example, look at the air vents on a home without central air conditioning, small vents. Homes with air conditioning need larger vents about twice the volume. The reason hot air flows twice as fast is because the molecules are moving faster and it is less dense.
Whoop!!
shit they got mods for it yet?
The only Interchangeable parts between the 440 and the 500 is the carb. Lol
Nothing like air filter udders 😂
Maybe it milks out more hp lol.
Couldn't one take the rod and machine to use bushings, yes its extra cost
Full build and turbo charge it