two stroke engines

[john999]

can i disable the oil pump on my two stroke suzuki dt40 and pre mix the fuel

[logic]

i wouldn't have thought so, as the crank and big end probably depend on oil pressure, to keep the friction down,
But if you are thinking of doing this you must have a reason for wanting to do so,
Have you got an oil pressure gauge that is already showing low pressure,?

[Graham-W]

It's a 2-stroke, logic. There is no pumped oil supply to big ends and mains.
Yes, John999. You can disable the oil pump and premix. Most of the road racers in the '70s,when I did a little club racing, did exactly that. The only real problem is you will have very little oil going into the crankcase on the over-run so there is a danger of seizing when you open the throttle after slowing down. Make sure you are set at a decent tickover and you shouldn't have a problem.

[PeteHull]

I used to run a Wartburg car which had a 3 cylinder 2 stroke engine, I used to put the oil in the tank prior to filling at the recommended ratio, I ran this car for 13 years with no problem. I think what you have is a seperate tank delivery system where the oil is kept seperate. I would think that if you did away with that and just added it to the fuel like I did it should be ok, the only thing would be to get the correct ratio.

hth
Pete

[john999]

hi,thanks for the help, getting the mix right isnt an issue but does the oil pump have to come out? anyone?

[Graham-W]

I'd say yes, otherwise you could get extra air into the crankcase through the pump. This would weaken the petrol/air mixture and cause overheating problems. On my old Yamaha it was easily removed and the oil-line plugged to prevent air entry.