Fuel type for modified 2008 yz250f?
I was wondering if premium fuel at the pump is good for my bike or if I should go with a racing fuel. Its the 2008 model with 13.5:1 compression. The only engine work done would be JD jet kid and the factory 4.1 fmf pipe with megabomb header. Other
Just use premium pump petrol, your list of things you have done to the bike have nothing to do with fuel requirements and it sounds like a standard motor which doesn't require racing fuel. If you tried to run racing fuel in it you would loose heaps of

