MS 661 "4 Stroking"

[Mad3400]

I got a 661 (Standard Carb) and no matter how I tune the High jet, it'll 4-Stroke wide opened in the cut with a 36" bar and a sharp chain.

I heard that the Non-Mtronic uses the same coil as the M-Tronic version with a Limited Coil,
Is that true?


Is there a modification I can do to remedy the 4-Stroking, annoying as Hell.

Thanks,
Mad3400