5.5hp honda engine mate to dirt bike transmission
- Thread starter Jim4626
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You'll want to remove the engine part of the yamaha and find a way to get input to the trans. Not impossible, but you don't want to waste power spinning one engine that doesn't work just because it has a gearbox stuck to it. You can find new engines with gearboxes already on them for like 2-300 on ebay, might be worth a look.
it would be easier to buy to engine and trans together but i figured since i already have an engine an a transmission i could make something work. i plan on removing as much of the engine as possible from the yamaha. i could even possibly use the power from the yamaha magneto and have electric start
2SlickNick
American Minibikes @ FB
Just get a torque converter. It sounds like a very far fetched idea to run a 5hp off a dirtbike bottom end.
I don't see that ever happening. Also Those are geared for a high revving machine.
firemanjim
Just kartin' around....
Its actually possible..... I've seen it done,cajun hillbilly redneck style, but it did work. The dude had a 110 with no head, and made a coupling to connect the cranks. He had an 8hp Honda up to it though. And it ran as good as the 110 did, before it blew..... Actually, it's more power than the 110 (i think). Either way, with no governor and heavily modded, that Honda made his bike CRUISE! Oh yeah, he had this on a home brew dirt trike.
I haven't lived in Franklin LA in many many years..... Maybe I can find some pics..... I know I have some in one of my computers.....
mckutzy
Well-known member
I wouldn't think that the lower revs(from a clone) would have any effect to the trans portion of the motor. The trans does need a way for oil circulation as they rely on the motor oil and combustion to distribute it.
Most conversions I have seen, typically have to cut off the motor section, weld in a blank, modify the crank/clutch input for a sprocket, so the trans will work.
If look for a non unitized trans off a motorcycle, although there isn't many options for that one, and aren't cheap.
Most conversions I have seen, typically have to cut off the motor section, weld in a blank, modify the crank/clutch input for a sprocket, so the trans will work.
If look for a non unitized trans off a motorcycle, although there isn't many options for that one, and aren't cheap.
ML-TOYS
New member
These are not actually made for shifting on the fly. Ka booooom
i was thinking of doing exactly what mckutzy said and bolt a plate and gasket over the open engine hole and making sure the oil is still flowing good in the trans. If i welded a sprocket on the flywheel and a sprocket on the engine the engine would turn the trans the same way the original yamaha engine would have. Except i would have a clutch an 5 gears to get the kart moving. i think the trans would hold up fine seems how the trans is from a 125cc and the engine is somewhere around 160cc.
OzFab
Well-known member
Please note the Edit button in the lower right corner of your posts; please use it as opposed to making multiple, consecutive posts minutes apart...
mckutzy
Well-known member
I would look into making adapters where/whenever possible, for shafts ect. Welding anything to them makes that a permanent change, and sure enough with any experimental machines, you will eventually need to change/replace/ do maintenance, with something in the way that doesn't come off.
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