Question about Honda Motorcycles
Qr50 has spark but no fuel to the plug, carby has been done, good compression, starts with a splash of fuel on the plug? bike was running fine then stopped while riding and will no longer star. great spark, good compression, carb has been done just not getting fuel to the plug, would a dropped exhaust valve cause a vacuum issue and not draw the fuel to the plug???
Posted by Anonymous on
Hi, Anonymous always check fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing*
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn*
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working*
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
* If equipped or applicable.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
honda QR50 SHOP MANUAL CD OR DOWNLOAD $5
HONDA QR50 Owner Manual
Posted on Sep 12, 2017
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Posted on Jan 02, 2017
SOURCE: Sym Jet euro 50 wont start
if you put to much fuel in the pot you might have flooded it....did you take off the fuel line to make sure you have fuel comming out?if it is not fuel injected.than try changing the jetting in it.does the plug have wet oil on it when you take it out or what color is it?
Posted on Mar 26, 2009
SOURCE: Yamaha 2002 TTr 250
Look around your bike near where the throttle cable meets the engine, when you pull the throttle, the cable pulls a quarter circle piece of metal which is connected to a spring, then connected to that should be a screw, that is the idle screw, turn it very slightly, usually clockwise to make the idle higher, and this should sort out the problem.
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Posted on Apr 12, 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.
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Posted on Apr 14, 2009
SOURCE: bike wont start
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean the air filter. Install a new stock NGK spark plug.
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Posted on Apr 19, 2009
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