919_250x Posted March 29, 2010 Stalling while riding 2006 CRF250R I can ride "all day" on flat smooth ground at less than 1/2 throttle without a hint of stalling or "killing". As soon as I get aggressive, going over logs, going up rocky hills, wheelies, 1/2 - WOT, in short bursts, by short bursts I mean 10 - 20 secs. Riding tight woods. The bike will run fine for a minute and then it will start sputtering and spit-n-sputter and then kill. If I wait 15 seconds, kick start it, it's fine. But if I start riding hard, it will do the same thing again. 2006 CRF250R Stock header w/V&H XCR SA AP Mod w/wire Shortened AP diaphram shaft 172 main 42 Pilot 55 Leak 2 out FS JD Red Needle 5th Stock piston with good compression Steahly Heavy FWW Less than 50 hours Things I know: Valves are all in spec. √ Gas is fresh √ Plug is fresh √ Pilot circuit is good√ Hot start is seating fine and working correctly √ Bike starts great √ Bike idles great √ Has good throttle response √ Has NO bog √ I have not changed my leak jet - from reading on TT not sure to bigger or smaller. Have read both with conflicting results. The other item that it may be is plugged or pinched vent hoses. WOULD REALLY APPRECIATED SOME ADVICE ! Share this post Link to post Share on other sites
919_250x Posted March 29, 2010 OK - So I went home at lunch, it's 50 degrees outside, I am at 1000ft. Started my bike 3rd kick, warmed it up, was idleing at 1800 rpm, checked my pilot circuit, it stumbled at 1 turn out on the fuel screw and again at 3 turns out. I returned it to 2 turns out. Idles just fine. Sounds good too. Took it for a ride out in the "back 40" The bike ran strong, pulling the wheel off the ground coming out of the corners, I a point to vary the throttle as much as I could but spent more time above 1/2 throttle. I road it hard for about 3 minutes and pop-pop-sputter - die coasted- popped the clutch took right back off again. I quick turned the fuel valve off and road it a little bit. Took it back to the garage, there was plenty of fuel in the float bowl. Disconnected the gas tank line, let the gas run, flow from the tank is good. It's like something is blocking the fuel flow within the carb or there is a "lock" in the carbs. It's lean but not sure why or where? HELP Share this post Link to post Share on other sites
919_250x Posted March 29, 2010 That's what I thought too. I took the hose off the tank cap and ran it just with the IMS cap, it didn't improve the stalling issue. I think that I'll try the old tank tonight. Maybe the tank/cap setup is the issue. I installed a new IMS tank and cap over the winter. Thoughts? Share this post Link to post Share on other sites
