Few weeks ago i managed to get hold of a TL125 engine with a 150 kit already fitted. Dropped the engine straight in and away we went. 1st gear is fine, but whenever i shift to 2nd or above the bike is jumping out of gear.
Rather than stripping down the box on this engine i thought i would swap the top end off the 150 onto the bottom of my 125. Is this as straight forward as i am thinking or is there anything i should look out for.
the 125 engine originally had the 122cc cylinder and the 150 one was the 124cc.
thanks.