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need help asap

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Old 03-11-2011, 12:37 PM
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Exclamation need help asap

i have a 49cc 2 stroke engine. unknown bike module. the thing is the bike was runing good. then it shut off, after that i try to crank it on but it wont turn fast enough to start. but when i take out the spark plug it turns over fine and sounds as if it wants to turn on... any help please?
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Old 03-11-2011, 10:17 PM
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Taking out the spark plug and trying to "start it" isn't achieving anything. All you're doing is creating an air pump and pushing air out of the cylinder.

Now if the engine was running fine and just refuses to start after you shut it off. Assuming you have compression. For the engine to start, you need 3 things, fuel, air and spark. If it's not starting, you haven't got one of those things. Take the spark plug out and leave it attached to the lead, place the plug against the engine and pull the starter and look for spark. If you have a decent spark - that's not your problem.

Next is to look for fuel. Put the plug back in and try and start it. After a few tries take out the plug and see if it's wet. That will tell you if it's getting fuel. If it's completely saturated! Then you may be getting too much fuel and "flooding the engine". So if it's dry, or if it's soaking wet. Take the carby off, take it apart, and clean it thoroughly (use carby cleaner). It may be blocked not letting fuel in, or it may be jammed and just pouring fuel in (flooding it).

Give those a shot and let us all know how you go. My gut feeling is you've either got a dead spark plug (OR, the kill switch is rooted and it's engaged full time). Or your carby is blocked.
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Old 04-11-2011, 09:04 PM
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Typical street cag. Carby is blocked. Take the carburetor off and give it a good clean with WD40! Blow out the carby with compressed air making sure to push air through all the little holes, put it back together and on the bike and run 30ml of a good 2 stroke oil, not BP mower oil and 98 octane premium pump fuel and it'll run a treat.
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