hi guys,

i purchased a mrk2 rs250 a few years back that had a running fault the guy i bought it off was fed up with two strokes and got it very cheap, anyway the problem was that it started fine run fine but when riding hitting power band it would choke up and be smokey, i found that the oil pump when turning bike on(clean sweep) was staying open causing alot of two stroke to be pumped in even on tick over ect, i changed the rave control unit and all seemed fine, but ive finaly pulled my finger out and getting it back on the road(4 years later) and it seems to have come back? have any of you guys had this issue before?