One piece head and cylinder

[LewieBike]

They might as well start including 5 speed transmissions, once you get to a 125 cc engine you're gonna need more than one gear.

 

[deno]

Hello all, can anyone tell me the difference between LD and YD?

 

[ImpulseRocket]

Hello all, can anyone tell me the difference between LD and YD?

Should have made a new post instead of digging this up from the ancient times.

Difference - yd100 is single piece. LD100 is a 2 piece. The LD also uses a socket style exhaust instead of a flat flange. The intake flange on the LD is also very thin at the edges and notorious for having intake leaks and being really hard to seal.