03 rm250 jetting help

Eric or anybody,

My 03 rm 250 has very poor responce right off the bottom. It seems like I'm alway's stalling it. I know it's a known problem with that year and have tried different jetting, wet sanded my slide from a 6.5 to a 7.0, retarded the timing, fly wheel weight and everything else I can think of. Is porting my awnser or is there something else I could try? I use it for woods riding and would like it to have more of a typical woods type power band.

Also my Idle changes through out my ride. Sometimes it wants to Idle good other times after I let off the gas and hold the clutch in I have to keep revving it so it doesn't die. I don't think it's my clutch.

Thanks, Chris.

Thanks for the very informative responce Steve!! I will read up on that stuff and keep tryin. Also I took my carb off my yz250 and it has a 7.0 slide I might try too.

Right now I have these settings.

165 Main
One size bigger needle on strait portion (leaner) in the # 3 position.
48 slow
air screw at 1.25 - 2. depending.
Power jet is stock (50).
NGK BR8EV

I have a stock pipe and an SST FMF pipe with V-force reed block. Brand new top end and a replated cylinder. Also I run my bike from 100 to 4000', but mostly between 1500 and 3500. I might try a little octane booster but I use a lot of gas in the Mountains and am not going to jet with race gas, too exspensive. I will pull the carb off and do a good cleaning/inspection as Eric explains on that link and what else ever I can find on all those links you provided. Thanks agian.

Chris.

I live near Sacramento / Bay Area and I can get some race gas for about 5 to 6 bucks a gallon but is twice as much as 92 octane. After you said you use race gas and it cleaned it up I remembered when I first got this bike I would talk to Rodney Smith when I would see him at the tracks and he did the same thing to clean his up too. My track bike is a 06 YZ2250 and runs incredible off pump gas, so I know there is hope. Both of these bikes have very simular cylinders and power valve mechinisms. This was the first year Suzuki ran this engine I think so I was hoping Eric would have some insight on the known problems or fixes?? I might try a 50/50 mix next time I ride this thing.

I am running my stock pipe now because I read on another forum that the SST pipe increases piston crown temps. Any truth to that anybody??

Another thing in Eric Gorrs carb info link he said that advancing the timing helps out with the low end. I thought it was retarding that helped out with the low??

I'll let you know what progress I make.

Thanks, Chris.