Idle stays high after rev'd
I have an 04/05 TRX450R with an 04 CRF250R carb bored to 42.5 mm's. I am running a 162 main jet, 45 pilot jet, HRC needle with the clip in the 4th position, and a 55 leak jet. My head is ported, I have an HRC cam, CP 13:1 piston, and a pro design pro flow kit with a Uni air filter. I run VP110 fuel straight.
I have 14 hours on this setup, and the quad runs amazing, except the idle stays high for a little bit after I rev it. This has been going on since April.
Tonight I decided to diagnose the problem. There are no air leaks, I installed a brand new throttle cable, and made sure the cable was adjusted properly. Still my idle stays high after I rev it.
Logic would say I'm running lean. Here's where things get interesting, when I closed my air fuel screw my quad stayed running and didn't miss a beat. When I pressed in my hot start lever the quad rev'd up slightly. This led me to believe I'm running rich. Dropped my pilot to a 42 and a 40, still rich and I can still close the air fuel screw without stalling the quad. Dropped my main jet to a 158 and then a 152 still rich (closed a/f screw still runs) and the quad still runs fine, and the idle still stays high after I rev it. Leaned out my HRC needle, no change.
Tomorrow I am pulling my carb apart and cleaning everything. Can anyone think of anything that could cause my idle to stay high after I rev it, and also make it seem like I'm rich? I'm guessing there's a clog somewhere maybe.
And yes the plate on my slide is facing the right direction.
Any help would be great. Thanks
2004 Honda TRX450R motocross build in progress
1997 Suzuki TL1000S- Bolt on Yoshis, Powercommander III, Double Bubble windscreen, and a fresh K&N