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My crf 450x stalls at low rpm when i nail the throttle.ie when trying to hop the front end over a log or ditch ect.if i run avgas its less noticeable but still anoying.i bought the bike new and it has always ben this way
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I don't know the CRF 450X, but my Helix had a solenoid that shut off the gas automatically when the ignition was turned off, and did the same when the wire came off the solenoid. Sometimes those solenoids fail, too, and replacing them is the only option. If the wiring is good (test it first!!!) you can tell a bad solenoid by holding your hand on it and turning the ignition on and off. If you don't feel a thump, it's bad.
The carb has a bypass that allows the throttle to squirt fuel into the carb when you roll on the throttle. That will get the bike to start even if the fuel solenoid has blocked the main flow. Then, of course, the bike dies as soon as the fuel from the accelerator pump is gone.
Other possibilities include sludge in the tank, a plugged fuel filter, or too much water in the gas. If any of those happen, StarTron can sometimes eat the sludge and nutralize the water and get you going. I like SeaFoam a lot but StarTron works better for me.
If you're saying that the RPM's are too low (less than 600), you need to clean the throttle body. Make sure to clean v=both the front side and rear side thoroughly. Also, disconnect the battery while doing the cleaning, this will reset the computer and allow it to relearn to the newly cleaned throttle body.
clean the carbs and sync them and make sure the idle is set at the right rpm. with older bikes pulling the front end up with just stock jets and gearing takes alot of effort unless you dump the clutch at about 6000 rpm while rolling.
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