2009 yz250 - at closed throttle the bike self propels in blips every 1 - 2 seconds
Posted 27 May 2012 - 01:19 AM
my yz250 seems to be self propelling when at closed throttle, I'm thinking it could be jetting related although its strange, when I put the bike back together after machining the head for squish and cc'ing to bring the compression back down it ran fine and didnt do this, but now after maybe 2 hours use its now doing this, Ive had this happen before when I had a higher compression head,
could this be jetting if so where would I begin to start to rectify the problem?
the bike is a 2009 yz250, Pro circuit R304, V force V3, head squish 1.22mm, and ran on 98 octane fuel.
any help would be much appreciated.
Posted 01 June 2012 - 08:38 AM
Posted 03 June 2012 - 01:56 AM
the oil mixture is 40:1 and the plug is a 9 I've tried both iridium and normal and both seems the same, I'm going to try an 8 tomorrow.
how many psi would standard comp be?