Question about RC Xrc Gas Rc Car Scooter

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49cc Pocket Bike Carburetor Won't Draw Fuel

The motor fires up briefly when I manually inject fuel through the throat
of the carb. Will not fire up otherwise. I have completely cleaned the
carb twice. I siphoned the fuel line to make sure that the fuel is available
at the carb fuel inlet. I also have purge pumped the carb (repeatedly pressed the plastic bulb at the bottom of the carb). I have been working
on small engines for many years, but this one has me totally at a loss. Any suggestions?

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First off, are you getting fuel to bulb? if not are you sure the lines aren't on carb backwards. if you are getting fuel to bulb and won't run then here's what i'de check. how's the compression, may not be making enough vacuum to draw fuel, have you removed the mixture screws and blown out passages, there is a little sreen under diaghram in some of those little carbs that gets clogged, carb base gasket?

Posted on May 18, 2010

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My x7 pocketbike does the same thing so Im going to try this solution as soon as i get home

Posted on Sep 18, 2012


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1 Answer

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For a motorcycle engine to run you need compression, ignition (spark) and fuel. Quite often with a bike like a Suzuki if the plugs get even a little wet but otherwise look like great plugs, the motorcycle will not start. So, new plugs are a good place to start, however if you put in new plugs and try to start a few times and have fuel but no spark the new plugs may become unable to start also.

FIRST check to see it you have spark at the spark plugs, then remove the plugs and either do a compression test with a gauge OR put a finger over the plug hole and turn it over and if you have adequate compression the engine will blow your finger off of the hole when it comes up on the compression stroke.

If you have a carburetted bike you can check for fuel by taking off the air filter and operating the throttle a few times full open in which case the accelerator pump should eject a spray of fuel into the carburetor throat. With Carb or Fuel Injection you could also spray some fuel into the carb throat or the induction module throat while turning the engine over with spark at the plugs. If you have spark and compression but no fuel th eengine will fire when you spray the fuel into it.

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Hi Anonymous, sounds like you have a fuel pronlem. Check fuel flow to carb, check fuel filter remove air cleaner and squirt starter fluid or Brake Kleen into carb throat, if it fires up and runs for a few seconds then you have a carb problem. Remove carb and bowl clean clogged jets and air passages, and clean bowl. Visit website below to download cheap ( $5.50 ) service manual that will walk you through it and also trouble shoot:
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If you have spark, compression, and fuel to the carb but not at the plug. You have a clogged carb. Try starting with starting fluid, if it fires briefly, your carb needs to be removed and cleaned.

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If you have oil and gas and it will fire then try a new plug. A bad plug when removed will appear to be fine but under compression can fail.

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Thanks for using FixYa!


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if you have fuel injection it could be a bad throttle body injector. Spray methanol from a squeeze bottle into the open throat, if it fires even once, then its lack of spark

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