idleing

[fatbiker]

can anyone tell me if i am right in thinking that my carb inlet rubbers have perished, because when the bike is warmed up the idleing speed increases between 3-5 grand but when i hold the carbs and lift slightly the revs then  decrease so has anyone got any ideas. p.s. there is no visable signs .

[DesignBuild]

sounds like an air leak, spray some carb cleaner on the boots while running to know for sure.

[Re-run]

Doesn't sound like bad boots so much as stretched clamps allowing  air to get in.