make a 26cc rc engine run in reverse?? for motorised bike and a goped??

joshua97

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hi i have a motorize bike project, its a friction setup I'm making (engine on right of bike), using the rear end of a hoped sport, basically i need the Chung yang 26cc engine to run n reverse (so bike goes forward) the way iv built it makes it too hard for me to mount engine on other side etc, i was told all i have to do is retime ignition?? ,but if in reverse with the bolt holding the spindle to crankshaft come lose (will i need to change crankshaft to left thread?)... i also have a goped geo sport with the engine on the right side to that needs a new motor? what if i put another cy 26cc on the goped but use the ild goped motors magneto on the cy26cc to adjust timing??? i really don't know what I'm doing in terms of running them in reverse :-/ so any help is greatly appreciated, thanks :), josh
 
yea i would love too, But the way the motor is mounted at the moment and the tank swell, would mean that i have to weld some sort of mounts to frame etc, but i know i can reverse motor rotation easily, as the goped had a Zenoah engine that ran in reverse as well, but thats blown and not rebuildable :( . i know its a case of retiming it but how- i don't know.
 
any piston port/reed valve engine can run backwards. so yep. you gotta retime it. how? most coil units are designed for one way operation. maybe the zenoah coil will fit?

otherwise, good luck :)

theres a standard convention amongst small motors to spin the same way. so im dubious of any zenoah running "backwards". then again, marine uses the other end of the shaft and so spins "backwards". zenoah makes marine!!!

starting...starters only work one way. if it has centrifugal good luck clutch starting...

good luck finding 1 left handed crankshaft for an engine that has only ever been built right handed. hard enough tracking down an OS FS26 LH crankshaft and cams, which were actually manufactured!

you say you built it... obviously you have overlooked a fundamental design criteria. back to the drawing board. sorry :giggle:
 
I gotta agree with HeadSmess, HUGE design flaw. But, Pitbike and goped engines run the other direction and they're a dime a dozen. When I was a newbie I checked out putting a goped engine on a bike. It's hard to do because it runs backwards from a chinese bicycle engine.
Good luck bro,
Big Red.
 
I gotta agree with HeadSmess, HUGE design flaw. But, Pitbike and goped engines run the other direction and they're a dime a dozen. When I was a newbie I checked out putting a goped engine on a bike. It's hard to do because it runs backwards from a chinese bicycle engine.
Good luck bro,
Big Red.

I run two goped engines on my bikes. One is a Tanaka 47R racing engine, the other is a CY460 engine. The Tanaka is rare and expensive. At $255, the 460 is moderately priced.

Both, like all goped engines, spin counterclockwise.

LOL, I know why Big Red thinks they run backward.

Many gopeds run the cheap Mitsubishi clone and bolt them to 5:1 trannies.

The trannies REVERSE the engines' rotation. that's why my crankshaft faces to the right, on my bike.
 
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the problem with crankshafts and saying clockwise, or widdershins ( :p) is its all dependant on which end you stare at them :(

HT engine, spins opposite direction to wheels due to single SPUR gear redux.

straight shaft brushcutter spins same way as a bent shaft, but gearbox at end reverses rotation, so cutter head rotates opposite direction.

a pit bike engine spins the same way as the wheels. the primary gear shaft spins backwards, secondary gear shaft or output shaft spins same way as wheels.

ducati, i believe, spins backwards.

most car engines rotate one way looking from the front.

all model aeroplane engines rotate one way except for the occasional small runs on counter rotaters for twin and quad engine setups. then you have to try and find suitable props in both hands.

pusher props on planes are reversed to standard props, as the engines mounted "backwards". the shaft spins "the wrong way" to just put a tractor prop on, unless you got that counter rotater set.

for some reason pushers and tractor props cant be used together on twins.

the mustang p82 uses two rolls royce merlins. one is a specially made one for running backwards. they only made something like 700 counter rotating sets. restoreres now have to get them cast individually. and get the props specially made. but when you can afford half a mil on just one engine, i doubt moneys the issue :)


somewhere on youtube theres videos on reverse gearing...where both gears mesh but rotate the same way!!!!
 
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