I have been battling to get my bike running right (1999 YZ 250) for the last month or so. I have replaced my reeds with a Boyesen Rad Valve, I put on a PC Shorty R304 Silencer, jetted it until it made my head spin.
Carb Settings:
Pilot - Stock 50, I have a 45 in there
Needle - Stock 3rd Pos, I have in the 1st Pos (highest clip Pos)
Main - Stock 172, I have a 178
Two weeks ago I went racing and it was bogging from zero to half throttle so I took it as a rich setting, and it was blowing smoke so i dropped the pilot form a 48 to a 45. It ran slightly better.
This weekend I practiced in the morning it would again bog through zero to mid throttle like it was a rich setting again. So i raised the clip to lean it out more, i didn't have any more jets so this is all i could do. I took it for a test run in the pits and it seemed to run fine from zero to full throttle. Raced it and it was right back to the way it was in practice. Just bogging real bad zero to mid again.
I talk to somebody, and showed my plug, my plug looks pretty close to good (the chocolate brown color everyone speaks of) so he told me i probably have something stuck in my pilot, so i once again tore my bike apart, my carb was FULL of dirt, i looked in my airbox boot and it had wet dirt in it. not sure if it was oil or what, with all the dirt inside there. I thought that was kinda odd, so i took that all apart and cleaned it out really really good, and clean out my carb completly. I thought this would have fixed my problem. I got up for the second moto and i got it on the gate and reved it until i got a nice crisp sound not bogging. Took off okay and then about the second turn, back to bogging. This time is would bog from zero to mid and when i would land hard on a jump.
I haven't opened it up again to see if theres more dirt in it, but i have seen it in there before and had to clean it out. Could this be my problem? (i don't mean the dirt i mean the air leak or how ever that dirt is getting in there) I'm going to silicone around the gasket of the boot, I feel like i'm leaning it out way to much. I do have an extremely slow drip out of the crankcase.
Sorry for the long post, i just don't know what to do anymore, i have no power in the bike and i cant clear jumps and not getting good starts.
Thanks in advance.