Reply To: Oil ratios

Forums Technical Two Stroke: Help needed Oil ratios Reply To: Oil ratios

Membership Man

Something not to be overlooked and not mentioned so far in this debate is that changing the premix ratio also affects the fuel supply. Adding more oil weakens the mixture, reducing the oil ratio richens the mixture. MZ took this into account as follows: The 4spd TS250 uses a 140 main jet(33:1), the Supa5 1 135 main jet (50:1) and the ETZ250 (with oil pump) uses a 130 main jet (no oil in the fuel) in what was essentially the same 30mm BVF carb.

That should fan the flames of debate.