Originally posted by modellor
I would say that the increasing the diameter of the carb opening or boring out the crank would give most increase in fuel consumption.
that is probably true. i did notice the difference in run time when i remove the restrictor on the carb. on the same engine.
The difference between my RB X12 with a EFRA legal crank and the same engine with a Novarossi T5 crank is about 2 mins worth of run time. With the T5 crank I get approx 5mins 30secs and I constantly ran with the stock crank for well over 7mins 30secs.
same carb. ?