A Side Project

AutOtaku

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Nov 24, 2015
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108
I picked up a side project today from my dads storage house. Its a small 25cc (i think) mini chopper that i was only able to ride once. The plan is one of 3:

1: Get a replacement engine of the same size and just get the odds and ends that i would need to get running

2: Get a 66/80cc engine that we use on our bikes and try to adapt it to this frame

3: Get a Lifan 70cc (or larger) engine that are used to replace the engines on various Honda bikes. This would be the hardest option however....
Mini Chop1.jpg
Mini Chop2.jpg
Mini Chop3.jpg
Mini Chop2.jpg
Mini Chop4.jpg
 


AutOtaku

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Nov 24, 2015
Messages
108
Yeah but the ones I've seen like that have the drive gear on the opposite side as this one.....I may try and find a weed whackewhacked on craigslist for cheap and use that
 

skyash

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Jun 26, 2015
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755
Isn't your motor the same as a friction drive one in the bike kits and thay put 49 cc 4 stroke 142f motors on the bike kits to
 

AutOtaku

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Joined
Nov 24, 2015
Messages
108
Isn't your motor the same as a friction drive one in the bike kits and thay put 49 cc 4 stroke 142f motors on the bike kits to
The only difference between mine and a friction drive is that the friction drive a few more CC's bigger....that and friction drives are 4-stroke as opposed to 2-stroke

EBay got these
Do you have a link for this? This looks very well like it may work
 

AutOtaku

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Nov 24, 2015
Messages
108
So i tore apart the bike today and ripped out the engine. When i started to work on it today, The first thing i noticed was the pull start was broken. I attempted to fix it (and spent an hour doing so) to see if i could get the engine to run as it was not locked up and still had compression. I unmounted the engine from the frame to try and work on it in a more accessible environment. after i had the engine off, i notice lots of grass that had been lodged in the flywheel and up under the plastic cover by the coil and plug. I took the gearbox off and noticed that the clutch was charred to a crisp, I believe this was due to the grass getting lodge in the engine and burning (the only day i ever rode it was in a very grassy field). I continued to pull off the plastic covers and i noticed that the coil was also burnt and the wires were melted. It was then that i determined I did not want to even try and repair this engine and decided I would acquire a different engine. I believe the motorized bike engine would work well if i figure out a way to transfer the power from the clutch side of the engine to the sprocket on the wheel on the opposite side of the bike. I also feel as thought this engine would work well is because the kits online come with all the requirements to get these engines running: CDI, Tank, Clutch, Grips, Kill switches, etc. (in my case minus a pull start assembly). They also have a very large range of aftermarket/go fast parts to upgrade.

TL;DR Heres pictures

Mini Chop Teardown1.jpg
Mini Chop Teardown2.jpg
Mini Chop Teardown3.jpg
Mini Chop Teardown4.jpg

Forgive my "Rebel with a cause" friend, Jack
 

skyash

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Jun 26, 2015
Messages
755
i have seen your motor on friction drive kits before thers like a 30cc 35cc 40 cc 49 cc i just looked for 2 stroke pocket bike motor on e bay and got the pick .a shop near by got them to about $80 .if you are thinking of running a 66cc you need 2 poles for a mount with welder thats pretty ezy and a jack shaft the 66cc wold probably be the best if you can get it to work
 

AutOtaku

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Nov 24, 2015
Messages
108
Thats what i was thinking, My dad has a welder so making mounts wouldnt be very hard. As for transfering the power I would have a short chain on the left side of the engine with the chain running between two drive sprockets, I would weld the sprocket not in the engine to a piece of round metal (an axle if you will) and then weld the sprocket from the original transmission on the other side of the engine to the other side of the axle
 

skyash

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Jun 26, 2015
Messages
755
Yeah I made one I will put up a pic you can change the gears for ezy take off or top speed and the one on the back wheel
 

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