Felt Like A Good Time To Swap Engines

Here's my latest incarnation. Swapped the Subaru Robin EH035 engine for the 97cc Lifan 2.5 HP engine on the downhill MTB. It runs out strong & has more power everywhere. Too bad its over the cc & hp limit of State MB laws.
As long as I keep it under 30 & pedal along in high gear, I might fly under the radar.
Anybody know of a good looking readily available 49cc replacement sticker?
-Lowracer-

 

[rawly old]

21cc is a mite small for a chain drive. Soggy here too; you'd
likely need a larger roller than 21cc can handle to get any
traction with a friction setup. I'd consider using a 3L
fractional hp belt drive.

 

[Ludwig II]

I'm doing this as a prototype, I can lay hands on new build Chinese engines comparatively cheaply, but 21cc will be ok for the 16mph speed limit the regs impose.

If I then do a mk2, it will have disc brakes, a full 50cc, no pedals and run up to the permitted maximum moped limit of 28mph. And springs.

 

[Ludwig II]

Added to that, all the easy access stuff from minimoto dealers is chain, so that's the line of least resistance.

 

[rawly old]

I'm beginning to tire of the hassles inherent with motored bikes. It
seems no matter how many I build in various configurations, I can
never get one to perform just the way I want for much longer than
3 months before something deteriorates. On the other hand a
regular bicycle is becoming more and more pleasurable, no noise,
no constant tweaking. As it is, I log 4 times the miles on a regular
bike than on motored one anyway. When I build a regular bike
it stays built. In the long run they are less work and a darn sight
cheaper. I'm an old turtle content to drag my tail in the mud
at 12 mph. (Unfortunately, I'm still just a bit of an adrenaline
junkie, but I satisfy that on the downhill.)

 

[lowracer]

Rawly,
Pedal power is definitely better for your health.
Very true that a regular bike needs very little maintenance & keeps going & going like an energizer bunny & by adding an engine changes all that.
The reason I guess that we are all addicted to the MB bug is the pure joy of rolling along on a bicycle without having to pedal...
I also enjoy the mechanical engineering challenges that present themselves when both building them & fixing them.
-lowracer-

 

[Ludwig II]

The nature of the rules I'm working to mean I'll be involved quite frequently in the propulsion process, so I'm covered on both fronts.

 

[rawly old]

Me too, I suppose, but sometimes it's mighty
frustrating. I wish one of these engines would
up like an old straight six Ford.