Black Shifter Kit Jackshaft Kit Fits Regular 415 Chain 66cc 80cc Gas 2 Stroke Motorized Bike Bicycle

No directions made it hard to get together right, if at all. When/if you could get motor started it throws the chain bending mounts in kit causing to readjust over and over, the sprockets on pedals didn't clear pedal arm so modified, sprockets were to thick for chain so ground them down till they did, and once they are on the bike it's nearly or even is to get back off the bike without bending one. DO NOT BUY

i watched a lot of videos on how to put this together before i even purchased it. almost every video says the kits are junk, people cant seem to figure out how they go together or things just plain dont fit. upon reading most of the reviews for this kit i found the same thing. after purchasing i can tell you that its all b.s. everything went together perfectly, gears slid right over axle as did bearings. only problem i had is the crank doesnt work with my bike. that is my fault not the kits. i ordered the correct crank and am back in business. if you are on the fence, dont believe all the bad reviews. great kit, fits and works perfectly as should.

The shaft is made of butter. The 510 chain is stock so whatever. But the 1/2 x 1/8 chain has so much play in it, you could never keep it on the sprockets. The tensioner needs a bearing. Most of this kit will vibrate loose. The 9 washers spacing the plate will let you know when your time is near. Plus I had to drill out the holes on the backplate to allow my engine bolts thru. Took 3 months of tinkering! I build bikes in less than 5 hours....

These are random parts with no instructions for you to machine and try to make work. They didn't even send correct size flywheel keys just missed matched parts

Every part of this kit is junk. Every part of this kit had to be modified in some way. Without a lathe and milling machine it never would have worked. Even then, the materials are so shoddy, cheap, and sub par that everything that has any kind of load on it at all breaks in short order. Nothing is standard so can't be sourced, and there's a number of critical parts that are wrong or just missing! DO NOT BUY THIS WORTHLESS PIECE OF JUNK!

This kid is awesome for people who know how to weld and have the experience to be a master builder installed this on a three wheel bicycle what is seven speed I’d have to say with no speedometer approximately 35 mile an hour top speed pretty dangerous actually awesome toy it’s all you people out there that say this kid don’t work it’s a lie You just have to remember you’re playing with bicycle chain it does not have a lot of strength so you can’t put a lot of weight and torque on it and you’ll be just fine I live in the country and I ride this on the weekends one tank of fuel you should give me about two hours of ride time I’d have to say by now it has close to 100 miles on it the thing is awesome

You need to be mechanically inclined to install this because there's no instructions

I have hard time with that all parts ... try match put on my cruise beach bike ..not easy then i have buy some parts to add together hell damn well now ... I did it ... warning be prepare what kind of ur bike match with this parts... thanks