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?
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?
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Timing or stuck valve. If it is indeed getting fuel into the cylinder. Try directly squirting a small amount of fuel into the carb throat. If it then actually fires off you know the carb needs a cleaning. Be careful though as if it happens to backfire it can try to catch fire.
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.
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: Harley Davidson Manuals Mark Workshop
What year and is it carb or fuel injection? Chances are you have a carb model as fuel injection rarely gives this problem. Check choke operation on the carb. Assumes all other areas o/k, that is battery, ignition, starter motor etc. as a slowly turning motor is harder to start when cold.