CT90 125cc swap (postie, cub, lifan, pitbike, china, clone) 

An alternative to the Lifan is a 1984-85 ATC125M. You get Honda reliability, it bolts into the ct90, has the hi/lo sub trans with pull/elec start.. if you want a kick, you can order the components from the 110.

The lifan swap os by far the all around best option

So far your video has been the most informative one I've seen. I didn't even think to look on Amazon for the engine, cheaper than ebay. I got a 1967 ct90 for free with a locked up engine and what you've done is my exact plan.

Nice work on the Bike the fit looks well considering all the little Quirks and annoying items i have a 1964 S 90 that was my fathers and he put into inside storage in 1965 luckily the Bike is complete and original minus a engine refresh a Uncle did replacing Rings , Gaskets ,and some other minor things that Uncle at the time was a retired Mechanic and a Engineer and he thought he was going to use the Motorcycle but did not do so he also passed away

Nice! I had a Trail 90 years and years ago.

I made my own bracket, and everything fits. If you lower the mounting bracket by 30mm, the difference between the Honda and the Lifan, everything fits. The bracket that comes with the mounting plate was never made for the Honda and it causes the engine to be mounted at the wrong angle. The front of the engine needs to be tilted up a bit, there will be a sweet spot where the foot peg will fit, that is where the engine should be. The bracket that comes with the mounting plate is too short.

Think I have the same engine, going to put it on my 1968 K0 soon, hope yours still runs ;-)

your master link on your drive chain is backwards

Whats the speed look like, thinking of doing this mod

Size of front sprocket center ??

clip is backward on chain

Why did you fit the carburetor backwards [air intake facing forwards]?

Bruh I was just thinking my skateboard was too slow 😭🤘

What’s that popping sound.

I did 17/40 with a Piranha 140 swapped CT90

Omfg🤦 can someone just explain how to wire the lights with no battery iv been asking everywhere and no info at all on it

good to find out the other chinese engines don't really fit well, only hung up on 1 axle... i wouldn't want this. reason enough for me not to go this route in the future. one more tip, don't stump so hard on those gearshift levers ;-)