Another dumb idea. 👍

[ImpulseRocket]

I get dumb ideas a lot, let's just put that out there now.

I am well aware that this ranks up there in the world of dumb ideas, but hear me out.

I can get my hands on a Lifan produced replica of the Suzuki AX100 Engine for about 480 bucks delivered to my door.

I think this would be a fun engine to put in a gas bike frame.

It's not silly powerful. 8.25hp, fairly low compression, and a 4 speed gearbox.

Outside of potential chain alignment issues it could be made to work. The only real draw backs I see are needing fairly wide crank pedals, if they would work at all, and the weight of the entire motor assembly itself at over 40lbs.

As I said, it's a dumb idea, but oh so tempting.

 

[Sidewinder Jerry]

The thing is though. It wouldn't be very fast. 50mm x 50mm bore and stroke. Only spins to 7000rpm max and peaks power around 6200. There are probably Phantoms and Minarelli builds making more hp than this thing, and would have a higher top speed. Heck, the bike it came from only had a top speed of about 50.

The appeal is the 4 speed gearbox.

To deal with the crank arm issue I suggest using a swept-forward crank or a semi-recumbent frame.

 

[ismellnownlatters]

I think the frame couldn't deal with the stress

 

[ImpulseRocket]

To deal with the crank arm issue I suggest using a swept-forward crank or a semi-recumbent frame.

I had thought about that. In terms of width I don't think it's much, if any, wider than the 4 stroke kits with their transmissions, definitely not wider than a predator 212 with a cvt, so it would be manageable.

 

[ImpulseRocket]

I think the frame couldn't deal with the stress

That would depend on the frame, and how it's mounted. Considering people mount predator 212 engines with cvt transmissions, which coincidentally weight almost exactly the same, it isn't unreasonable.

 

[Sidewinder Jerry]

Maybe some modified version of something like this.

 

[ImpulseRocket]

Maybe some modified version of something like this.

View attachment 185411

A bit goofy looking, but a part of me kinda likes it. The only issue I see there is the pedal chain hitting the right side of the engine.

 

[Sidewinder Jerry]

A bit goofy looking, but a part of me kinda likes it. The only issue I see there is the pedal chain hitting the right side of the engine.

Chain guard track

 

[DAMIEN1307]

A bit goofy looking, but a part of me kinda likes it. The only issue I see there is the pedal chain hitting the right side of the engine.

Chain guard track

A chain guard???...What is that???...lol...lol.

 

[ImpulseRocket]

Honestly, if I could get my hands on a Phatmoto all terrain frame, I think it would be a good candidate for this type of engine.