HI guys,

i'm only new on the forum, i have an f3 myself but my friend has an f2
hes had it to a few bike mechanics, jets changed the usual one said cam chain one cause it to be hard to start when warm but i cant see it,

When the bike cool she runs like no other, amazing, but heat it up in traffic or a long journey, the engine misses, and if its then stopped,

and started when still warm its very hard to start,

have you guys came across this problem, is it a valve clearance issue,
as one guy seems to think thats all it is,

any help would be very much appreicated, hes about to throw in the towel at this stage