NEED ADVISE : I hadn't started the bike for about 3 months and when i tried it a few weeks ago i noticed a slight misfire at low revs. i ran it to the petrol station and tanked up hoping it would go away with fresh gas. No luck. It seems to have gotten worse today but runs smooth at revs exceeding 3500- 4000 rpm. The bike is FI & has run less than 10k kms. Ive replaced the FPR a while ago but apart from that I've never had a problem. Any suggestions ??