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2008 RMZ 450. Bike was working great and just quit going down straight away in 3rd gear. Wouldn't restart. Replaced spark plug. Bike will start after many attempts. Idles ok but as soon as you give it gas it backfires and dies. Valves are set perfect recently replaced top end. Bike has to be kicked for several minutes before it starts. Has good compression.
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sounds like a few things, bad/fouled spark plug,old/clogged fuel filter/old air filter or bad fuel. When taking bikes out of storage bikes often suffer from this problem from old fuel sitting in bike gumming it up.
Sounds like a timing issue or simply bD spark plugs. Do a spark check and see if you have a kice blue arc on the plugs. Also I've seen the flywheel key break on those before. That situation will greatly affect the timing Nd cause back firing also check your valve clearance.
My 2008 once got a "glitch", as it back-fired while restarting it after it's hot. Check engine light on, went into "limp mode" (20 MPH top speed). Turned it off, restarted, problem went away and never came back.
If you pull the error codes (DTCs) that would give you an idea.
However, it might be a one-time issue, so write down the codes, clear the codes, and see if they come back.
Do you mean upshifting starts way early? Going from 2nd to 3rd in other words?
Ireally don't know your transmission,but the alternator problem might've possibly spiked and hurt your shifting solenoids in the ******. don-ohio (:^)
Did you pull the carburetter off and clean it out also? If the bike was still running it has probably got a belly full of water. Great work on dumping and refilling the oil. But you need to check your carbs and your air filter. If the air filter is wet it will run for a little while then stop. Also check your spark plug and leads make sure they don't have water in them or haven't corroded.
So make sure you have good air, spark and fuel delivery.
try simple option first like change the spark plug as plugs can fail under load and cause this? if no improvement then I would get a multi meter and test resistance readings on your stator connection leads and also check resistance on your ignition coil pack - Your service manual will have the range of in spec readings for you to check against
This symptom sounds almost guaranteed to be electrical fault - best case new spark plug or worse case new stator or ignition coil required any auto ranging OHMS meter will give you enough information to know if stator needs replacing as your readings will be way out of spec on one or all of the sources
good luck regards Jamie
Check for spark first. If spark is there, chances are the carb has filled with water that has accumulated from condensation in the gas tank. Drain the carb, stick in a fresh spark plug and then give it a try. Please rate my answer. Thanks.
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