Honda GX160 mini bike engine restoration and upgrades
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- เผยแพร่เมื่อ 10 ก.พ. 2025
- In this video I restore a rather beat up Honda GX160 engine for my coleman ct100u mini bike. I add a few upgrades as well like high compression flat top piston, high compression 14cc cylinder head, 1.3 ratio rockers, 22lb valve springs, 22mm mikuni carburetor, high flow air filter and a header. thank you for checking out the video and have a great day!
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My son just got a mini bike with the GX 160, your video came up! I feel confident to tear one down and put it together now, thank you
They are great little motors! I'm glad to hear from you, man, and I hope your son loves the mini bike.
Bro, that Hank Hill portrait 👌👌👌👌
This was extremely helpful I currently have a Honda replica it’s a 7.5hp 212cc and just from watching this video I now know how to disassemble and reassemble a motor and also how to change the parts and give it some weight reduction 💯 just one more thing is if you could leave the links to the parts you have in your description
Can you link every part you used for the rebuild? I have a gx160 sitting in the shed waiting to be built. Thanks!
I added the same carb to mine and changed the jet to a 110 but it still bogs out when I crack it fast . I raised the pin all the way up with no difference.
Hey man really appreciate the video, the torque converter vid was extremely helpful as well.. I have the same gx160 from a scrap yard and this has inspired me to use it for the same thing.. would you happen to have links for the parts you bought? Thanks
I should be able to put the links to the parts together in just a bit for you man. Glad you found the video helpful!
@@jdmjedi777 absolute legend
@@jdmjedi777 hey can u put links here if u still have them please?
Did you use stock cam?
Trying to put one together, i have governor delete, 18lbs valve springs, mikuni and intake and aluminum flywheel. I was pondering a different cam🤔 i have a stock predator cam that i was thinking about using if possible, all of the measurements seem to be identical or Really Close, any imput would be Really appreciated.
Oh and What will the 1.3 ratio rocker arms do?
@anthonyreddy2834 The ratio rocker arms do pretty much the same thing as a cam. They increase the lift at the valves by changing the pivot point of the rockers. I'm using the stock cam for now. With the ratio rockers, you gotta be careful with how big of a cam you use to prevent piston to valve contact. My suggestion would be to clay the motor with the cam you want to run before final assembly.
Are you using a stock rod,If so how well is it holding up?
Hi i know its been asked already but do you have a full parts list for this? I'd like to do this for my sons go kart
Flat top piston - go power sports
1.3 ratio rockers- ebay
22lb valve springs- ebay
21mm carburetor/intake- Amazon
Exhaust and muffler- amazon
10k RPM flywheel- ebay
14cc cylinder head- ebay
I would highly recommend a billet connecting rod with these mods. However, I did not use one in this video.
Thank you for your quick response 👍
@samkinder6752 I am always glad to help.
good video man, thanks, i have the same motor for mine just blew up the motor that came with it, where did you get the piston and rings?
They came from gopowersports! Their website is great and they have a ton of mini bike and go kart parts
❤
What’s the main jet ?? 120 or ???
Looks like andonized paint. Nice job
Thank you!
Hey man, would that exhaust pipe fit on a blitz doodle bug mini bike 70cc frame with a predator 212 motor? I have a grab bar type thing behind the seat & a reinforced bar type thing below that. I contacted the Go Kart stinger company & they said they're not mechanics and they don't know! I burned my leg pretty bad & want a stinger exhaust pipe that is under ne instead of the the side of me.
PLEASE HELP!!
A cheap temporary solution would be to use either some header wrap or one of the mini bike exhaust heat shield tube thing they sell. It will still get really hot but it's better than just the metal exhaust pipe. It's hard to say if this exhaust will fit or not. It fits on my Coleman ct100u, but I'm unable to use the muffler because it doesn't clear the frame. It's decently tucked away but definitely still pokes out enough to burn your leg. They make some that exit under the seat. You may want to look at some of those and take some measurements to see what could work. Best of luck!
WOW MAN THANKS FOR THE QUICK REPLY I'LL CHECK THAT OUT NOW THIS IS MY FIRST MINI BIKE & DON'T KNOW MUCH SO I HAD TO ASK AN OG! THANKS
@oriigiinals4381 no problem at all. I'm always glad to help and do my best to respond to everyone's questions. Congrats on your first mini bike! Motorcycles are one great hobby to have.
Thanks, right 💯 🚀
Where u can buy that kind of intake manifold?
May I ask what kind of carburetor I want to change the Honda GX160?
Great video,, I have a gx160 thinking of doing this for my ct200 but was wondering if it would be big anough engine.
It's got some decent power for sure. Right now it's the fastest small block mini bike in my neighborhood. Couple big block 300 plus cc mini bikes around that pull on it good though lol
สุดยอด Welcome to Thailand
I hope to visit Thailand one day.
is the governor removed?
Yup! Sure is.
@@jdmjedi777have you had any problems with removing the governor?
well since
@aidenweaver7035 no problems at all so far
for low end torque i want to use pz20 20mm carb. is it too small for high rpms. my engine is bone stock with removed governor
A pz20 should do fine for a stock motor. If you do end up installing more upgrades down the road though, it could possibly end up a restriction. Torque converters help with low end torque a ton as well.
@@jdmjedi777 i got a pz27 from a friend. would it be too big?
What type of spray paint is that?
It's the duplicolor METALCAST in red color. It's really important that you use the duplicolor metalcast primer though. Otherwise it won't come out looking like this at all. It can usually be found at auto stores like oreilly, auto zone, ect ect in the automotive spray paint aisle. Kind of expensive though, like 10-15 dollars a can.
Where did you source the new parts from?!
A mixture of Amazon, ebay, and go power sports.
@@jdmjedi777 gotcha! Thanks for your reply!
@@enDNGRed no problem at all! I always do my best to answer any questions on my channel.
Very nice. Do they make a billet rod for the 160?
They sure do. It's the same billet rod as the gx200. The rods in the gx160 and gx200 are the same. Whats different internally is the crankshaft. If you need a link to one just let me know and I would be glad to provide one.
@@jdmjedi777 Just wondering why you didn't use one. I don't run very high RPM and still use them.
@@Deucealive75 mainly budget reasons lol I do plan on putting one in here when I get the chance. In the meantime though it has held up just fine for now.
@@jdmjedi777 Understood. The ARC rods are like a work of art. I should have taken pictures of them before they got hidden in the engine. I have them in a 196 and a 224.
@@Deucealive75 there is definitely something special about well machined billet aluminum. I think I might do a future video with a billet rod and bigger cam install. Would be cool to show what kind of a difference it makes.
So i blew my old engine up because its old, and i bought a new one and i am currently building the new engine up to a performance level. And by the way, what fuel would you run?
With the higher compression ratio on this engine I try to run the 93 octane from my local BP.
Where’d you buy that exaust
God danggit bobby
What cam you running
Just the stock cam right now but the ratio rockers give a very similar effect to putting in a cam
very secretive of the head dome
Ok galera
sorry to bother, but how much did it cost for all of the extra performance parts like the rockers and the valve springs? Im asking because i just got that same engine and want to do what youre doing here. Looks badass!
I believe I spent about 200 total in parts. 45 for the carburetor and intake kit on Amazon, 25 for valve springs and ratio rockers on ebay, 80 for the 10k rpm rated aluminum flywheel on ebay, 25 for the exhaust on Amazon and 30 for the piston from go power sports. If you have anymore questions feel free to ask. I always do my best to answer all questions and help out.
@@jdmjedi777 Thanks so much bro 🙏 i for sure will ask any questions i have on this build.
@@nichol8s898 no problem at all! I will keep an eye out for them.
Hey man. Good stuff. I too have this engine on a little go kart. You said about $200 on everything but how much extra hp and mph did you gain, and why didn't you put a torque convertor on it?
@@charlieharper6816 I would say the engine is making a solid 10hp or so and easily gets my mini bike to 50 plus mph. Here is a video of its performance on my mini bike with torque converter and with a clutch. For riding around the neighborhood I definitely prefer the clutch. th-cam.com/video/8j4ytNwDZjg/w-d-xo.html
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Do you have ig or fb. I got some questions
@jdmjedi777
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