Modern Vespa

Hi all, I have an lml 125 2 stroke with a 166 malossi kit.i have a px Maz comp crank fitted, it's running idle jet 4-140,a BE4 mixer tube atomizer and a 190 air corrector jet. The carburettor is still the standard SI type. And a polini race exhaust...I'm looking to you guys for your input as to why the bike seems to run poorly ie almost as if it is on full choke when you 1st pull away...but suddenly clears and pulls like a train....is this normal ?...is it the point where the power band is ? While on a long run the engine doesn't miss a beat and accelerates beautifully, it's only when you stop and then go to pull away again that the bogging appears.im very new to the scooter scene so please treat me as a novice.i really would appreciate any points in the right direction.Thanks Roy

That was normal for the the LML 150 engine I am replacing with a restored P200E engine but it's not supposed to be normal......and timing was the only thing i could never check due to damaged crankshaft threads.

Check timing and be careful with those threads.

See if you can find a moderator to move this to the Not So Modern forum section. Lots more chat about kitted 125 motors there.