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06 CRF 450 R. After complete dissassembly and cleaning of carbuerator, at 3/4 to full throttle, the throttle will stick. When bike is off, throttle linkage is smooth throughout full range (no kinks, frays, noticeable mechanical issues, etc..). Return springs, throttle body, etc.. all seem to be functioning properly. This hesitation or sticking only occurs when bike is running and occurs somewhere around midrange to full throttle operation. It's as if there is too much air passing through the carb and the slide can't return to idle. Checked for leaks, etc... Any thoughts?
Try taking the return spring out and give it about an additional one inch of length by gently stretching it out. Over time, the spring can loose some of its original tension.
Even the smallest debris particle can cause the throttle slide to hang up. If it isn't foreign matter causing it to stick, then there could be a ding or gouge in either the slide or the carburetor body. Take the slide out and put some blue machinists dye on it, then slide it up and down inside the carb - this will show you where any high spots are. Carefully remove the high spots with 1,500 grit wet or dry sandpaper.
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Disassemble throttle clean and lube it. Disconnect the throttle cable at the bottom end and use some spray lube at the top end. Let gravity do the rest of the work until you see oil come out the bottom of the cables than reassemble everything.
you pretty much can't hurt this engine no matter what you do but most important for all MX bikes is varied engine RPM speed so don't stay full power for long stretches and don't stay putting around for long periods vary your engine speed and gear selection as much as possible for first couple of tanks of fuel.
Ps - once you have done couple of tanks of fuel dump the oil and refill new - everyone forgets to do this!
the more often you dump and replace oil the longer your bike will last without need for repair (FACT)
good luck regards Jamie
This can only be lack of fuel for some reason backfire is nearly always lean fuel condition and the cut out pretty much confirms lean or no fuel?
I would be checking the size of main jet (they numbered) double check it is factory size?
I would check the needle clip position god knows why but people change the position so double check it is factory setting (usually 3 or 4 notches from top is factory setting I forget which one it is for Honda's)
I would double check your air filter is clean and/or not oil drenched
refer to your manual or ring your Honda dealer for all the specs
Some other possibilities would be
spark plug fail at high load (but unlikely?)
stator failing at high RPM ( unlikely but worth the two minute multi meter test to make sure resistances is still in spec)
good luck regards Jamie
Has your bike been jetted and tuned to suit new exhaust ?? if not its more than likely your problem.
If it has been jetted to suit you can try adjusting your fuel mixture screw richer or leaner to see if that makes any difference
Chances are the air filter is extremely wet. Air can't get through a wet filter, and if no air can flow through the carb, no gas can flow through either. Remove the filter and try again to get the engine started. I assume you drained and cleaned the gas tank already. If still no joy, remove the carb and clean it using spray carb cleaner. Remove the air screw and throttle screw and spray into the screw holes as well as all the little drill holes in the carb body. The object here is to clean out the pilot jet and idle circuit. When re-assembling the carb, put the air and throttle screws back in and turn them inward until they LIGHTLY seat. Now open each of them up one and one half turns. This is the factory setting. Please rate my answer.
Sounds like dirt in the main jet of the carb. Take the slide out and clean the needle. The pull the float bowl and blow air or carb cleaner through the brass jet in the middle of the barb, where the needle seats.
Make sure that you turn your fuel to the off position when you leave your bike sitting for more than a day. Gas will sometimes leave the tank, and pass through your carb, and into your cylinder. It will then bypass your rings and seep into your oil. Dosen't happen overnight, but after about a week i becomes common if your float is sticking. Good Luck.22
I have a crf 250 R and i have learned multiple things about these bikes like if you leave it running and not riding it for about ten min. it will over heat. they love race gas 113 octane,and alot more. but your prob sounds strange. i know if you hold the hot start while its runing it pops that could be a problem. or it could be you are not cleaning the bike out i would need to know more about this to give a definate answer but try going over the bike. Look at key parts like the carb air cleaner fuel line any thing that is nesessary for the bike to run.
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