Hello

I know this subject has probably done the rounds before but here goes anyway.

I've recently bought a 2005 Rev3 250, on the first outing I noticed that on the overrun with a closed throttle the engine was very lumpy, kinda fire then misfire sort of thing, I decided to take a look at the carb(DOH!)all seems well apart from the rear vent tube had melted against the exhaust.

Its now back together but it wont run unless im keeping some throttle open, I've adjusted the tickover to no avail and set the air screw to 1 1/2 turns out from fully in. I have noticed that the plug is as black as yer hat, I've been told to run it at 80:1

Any ideas what may be causing my problems.

Cheers in advance

Steve

Many thanks

I'll give it a go and hopefully it will sort things out. Looks like this is a regular issue.

Steve

sounds like you might have an air leak between carb and engine id strip the lot down as reccomended and put it all back together as per the instructions above