Question about Motorcycles
Posted by Anonymous on
I could be the the fuel petcock valve is shot as well. If that checks out OK then it would be the floats in the carbs. They would have to be taken off the bike and cleaned. Look up cb 800 honda carb cleaning on Google. It shows you exactly how to do this. Good luck
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Posted on Jan 02, 2017
hi 81 yamaha i am concerned about the fuel smell coming out with the oil. could be the carbs flooding filling your crankcase with fuel? if not it sounds like you have blow by which would cause your crank case to be slightly pressured. this is caused by worn piston rings. do not plug your crank vent. if you leave your vent open install small filter to stop dirt from entering jim
Posted on Mar 26, 2009
Yes, a dirty Carburetor can stop the engine from running.
Drain the carburetors. There should be a screw on the lower side of each CARB float bowl. Remove the screw then replace it after the fuel drains. Is there any water in the gas? Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, (not all bikes have a water trap bowl). Turn the gas back on and wait a minute for the carbs to fill with gas. Try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetors from the engine.
FOR EACH CARB > Remove the float bowl and clean the entire Carb with a spray Carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the Carb.
FOR NO SPARK > Check the fuses. Next, check for spark but with a new spark plug. How good is the battery? Is the kill switch on? Does the side stand have a kill switch? Is it working properly? Tip-over kill switch on your bike? Check the operation of the ignition switch and all kill switches with a volt ohmmeter.
Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center casing. If still no spark, get CDI system and coils checked at the dealers shop.
Please rate this answer. Thanks
Posted on Apr 14, 2009
Look around the engine oil drain plug and fill area and see if there is an electric sending unit( small plug with a prong for a wire) that is screwed into the engine if so check to see if its unplugged / could be a low oil cut off switch that kills all power to the ignition if the oil is to low ( or the wire is unplugged)
Posted on Jun 04, 2009
It sounds alot like a float needle problem. It might not be seating properly or it just could be worn. You could have had just enough residue that it sealed and when you cleaned it you might have taken that residue off. because of the ethinal in fuel these needles are worn away very quickly that would be the first thing i would check. When you take it out check and see if there is a ring around the top that is a sign of it being worn out. I hope this helps and good luck
Posted on Apr 16, 2012
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