Mounting a 6.5hp engine to a mountain bike?

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VirtualGod

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I have this kind of bike:



Can I mount my engine to that? I mean is that possible :lolgoku:

Sorry for those beginner questions.
 
ezcome-ezgo

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We've heard it here before: "anything is possible". How do you see it working?
 

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mckutzy

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If it were me.. If try to sell or trade that bike for a better candidate, and use that instead...
 
OzFab

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As mentioned by ECEG (& implied by my sig), anything is possible...

The simplest/best way I see is building a structure on the top of the swing arm to support the engine; this way, the engine moves with the rear wheel...

The downside to doing so is you will have a very high CoG (centre of gravity), meaning too much of a lean on the bike (as you would usually take a corner) will increase the risk of the bike falling over; add to that the thought of balancing the engine perfectly; if it's off even slightly, the bike will always want to tip over...
 
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VirtualGod

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Maybe I can build a rack but there is another problem.

Bike cassette is #219, clutch sprocket is #35. I need a single #35 sprocket to install on my bike.

Where can I find #35 bike sprocket?

It should be something like that:


But it should be fully compatible with the bike's rod or whatever it is.
 
ezcome-ezgo

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Wait, what? The engine driven sprocket goes on the opposite wheel side of the cassette. When the engine and clutch are engaged, the cassette will be freewheeling.
 

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mckutzy

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OP-honestly I think you need to do some more research on this subject.. Not only for the motor and frame compatibility issues... But actually how the drivetrain works for these bikes...

Also I think that also is way too much power for a bicycle to have.. Especially without any disc brakes....
 
mindymogul

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Thing is with something like this there's gonna be saftey and legality issues. Some states have laws that anything above 80cc (some states 50cc+) require for you to have a motorcycle license to use it for road use.

Also you'd have an issue of safety. If your brakes suck already (even if they were great) you're talking about adding about 42lbs of weight which is a lot to balance on something that small. Also the power/weight ratio, frame modification, and possible damages otherwise. Massive weight change over rear axle would change the gyroscopic properties and severely upset the balance, also cause issues with steering and front traction in general. You'd be better off finding a mini bike on craigslist or FB marketplace ads and slap the engine on that.

All in all what you're talking about is highly in unrecommended and could cause serious issues/injury.
 
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