It is interesting, on my Bighorn, just over fifty hours now including racing, I just use pre mix, 40 to 1, using ethanol is equates to about 20 to 1. I was worried about the lube situation but because of the position and timing of the injectors everything seems to stay oily, bigend, mains, rotary valve, etc. On the YZ the injectors are much higher up the transfers. So far it seems the oil still collects on the transfer walls and runs down to the mains and on to the bigend. It has only run an hour so we are still not sure. We have a small pulse pump ( about the size of an injector, able to be run by the computer ) that is on standby if we need it. We might have to squirt fuel down the inlet at high throttle setting yet but still early days. Head and barrel are coming off tomorrow for a first inspection. In the long run a small pump might be desirable anyway so mixing fuel is not required.
