Re: lexmoto lsm 125 help!!!
exhaust wise if the routing is right you could fit a XT125 exhaust allot of bikes use this YBR 125 based engine motorhispania duna use it the Sherco 125 does aswell, I know that Rieju used it in there MRT and RS2 125 and got 15bhp out of it due to the mikuni carb and CDI they were running so finding a wrecker one for the carb and CDI could be handy, sprockets you will have to see what the PCD is but firstly see how it is standard if its ringing its nuts off at top speed lower the rear sprocket tooth size to get more top speed thus straining the engine less.
Kennon