New purchase. Carb issues.

PO said the bike had been serviced 2 years ago, including valves checked. He also fitted a FMF Q4 tail pipe and FMF headers. He said it's been ridden for two hours since and ran fine. Just before it was advertised he had the carb cleaned and refilled the tank with new fuel, and it was started the day before I saw it.
When I viewed it he had trouble starting it, but it did start eventually, but the idle was high. He lowered it with the throttle stop knob but when the throttle was blipped the revs would rise again. After 3 or 4 adjustments the revs settled.
I then test rode it and everything was great.
I bought it and rode about 50 miles home. As it warmed up the revs at idle increased again. I decreased them with the throttle stop knob again and all was fine.
When I got it home I noticed a dribble of fuel from the drain pipe. I think I solved this because the drain screw was a quarter of a turn out.
I also noticed the pilot screw was only 1/2 a turn out.
I turned it out to 1 and 3/4 turns and turned the throttle stop knob to raise the revs again.
I got it started in 2 or 3 kicks (3 kicks with de-com lever in, full choke, TDC, lever in, push past TDC, lever out, big kick) but it dies and then I have to go through the flooding procedure and start again. It will start eventually but pops out the exhaust on the over-run.
I've also noticed that no matter how far out I turn the pilot screw the revs don't die.
I know I need to take the carb apart and give it a good clean and to check to see what pilot jet I've got.
I've also got to check the valve clearance and clean the air filter.
I thought that high revving at idle would be explained by too lean mixture, especially since the pilot screw was only half a turn out. Also the fact that the idle doesn't die no matter how far out I turn the pilot screw could also mean too lean. But over excessive popping on the over run I thought points to too rich?
I'm thinking maybe the FMF exhaust has upset the standard jetting, and whoever cleaned the carb didn't set it back up properly.
Anything else I should be looking at once I've got the carb apart?

Two sizes up on the main jet its the norm , but not the absolute rule with complete aftermarket exhaust system .

Hi,

download a copy of the service manual and check everything they tell you too in there.  as frosty said you will need to change the jetting for an aftermarket exhaust normally.  Note that when you set the float level set it 1mm higher (17mm?) than the book says.

Its a really easy carb to work on - enjoy!  (although I'm still trying to figure out what all the hoses are coming off it   )

SkidMark

Float height not set to proper height.
Float valve not replaced when the carb was rebuilt.

Thanks guys  Looking forward to a warm weekend so I can get out in the (unheated) garage and start striping it down.