Question about 1973 Honda CB 350 F0

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Motorcycle starts idles good. runs with not much power seems all ranges affected . about 2 miles in bike sputters and stops running .let sit for one minute and it will kickstart and run for about 1/4 mile then repeats symtoms. after restart the motorcycle sort of hickups and takes off with full power for a breif secound then back too about 40 miles an hour top end. drained tank new fuel stripped from tank down too carb vent hose seem to have good fuel flow did not rebuild carboraters only cleaned float bowls. checcked ground bolt. filters look original and blew them out with air if you all have any suggestions i much appreciate it steve

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Once again if your fule filter is to big or at an odd angle you could b sucking it dry and it runs again after gravity fills it up it seems simple but I've Ben there especially with thirsty bikes

Posted on Apr 20, 2012

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I suspect coil / wire / spark plug cap issues. Start with plugs and plug caps. Start the bike at night and observe coils and wires . Spray coils and wires with water if necessary to look for arcing wires. If coils are bad you may have to get Accell coil kit(comes with wires and caps). Honda coils are no longer available.

Posted on Sep 03, 2010

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I have a honda EX5 (GN5 engine) which is single cylinder and single cam.. the problem is,it's suddenly start to sputter after a ride in a heavy rain.. the idle is a little slack on it,sometimes it...


Hi, Saisoku this happens to a lot of bikes and different brands it is usually caused by water getting into the fuel system and/or moisture getting to electronic components, wire connectors, wiring harness. This situation usually clears itself by letting the bike sit for a couple of days in the sun. For more information about your question please click on the blue links below. Good luck and have a wonderful day.
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The bike wont rev up, spits and sputters idles fine. carbs have been cleaned and sinked new plugs and fuel filter.


Hi, Marvin if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or better, any readings in the 11 volt range you need to do a proper load test on the battery and replace as necessary, any readings in the 10 volt range you have a dead cell and replace the battery.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove your air cleaner and clean and re-oil per Mfg. specifications.
6. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
8. Replace spark plug with a new one and check for spark.
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I have a 1999 harley softail flstf 80 inch evo with only 2000 miles.it runs good cold but as soon as it runs for 5 minutes ..sometimes more it just cuts out.seems like its fuel choked off or powers shuts...


have you tried changing the gas filter...sometimes it takes a bit of time for dirt to clog it and it clears a little when the bike sits for a bit so that it starts after sitting then dies after running for a few minutes. hope this helps

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'95 Daytona 1200 has following symptoms. 1. Occasionally stalls/shuts off after riding for 15-30 minutes. Pulled into driveway today after 15 mile freeway commute and it stalled and wouldn't...


Hi, Sirwriterdud nice novella and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
13. Multi carburetors not in sync.
If your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly then stall, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
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4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove and inspect your air cleaner paper elements that are not oil soaked can be cleaned with a soft brush and low pressure compressed air, oil soaked elements must be replaced. Gause mesh and foam elements can be cleaned by soaking them in a container big enough to completely cover them with a solution of 1 gallon of water and 1 oz. of Dawn dishwashing liquid for small and medium size elements, for monster size double the formula and let soak for at least one hour then rinse with warm water shake off excess and let air dry, "WARNING" do not use compressed air as this will embed micro-sized dirt and road grime and destroy the mesh pattern and stretch foam elements out of shape just squeeze it like a sponge and let air dry, use a fan if you're in a hurry. When completely dry spray a very fine mist of air filter oil evenly around the whole element.
6. Remove the carburetors, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Remove fuel valve and filter disassemble and clean as necessary, remove, clean, and inspect fuel and vacuum lines and replace as necessary.
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I have a 99 road king 1550 fuel injected. on the way on a trip the engine lost power and shut down . cranked but no start. Took it to harley dealer where they found that the computer was fried, front...


Interesting story but other than the low idle, you never said how the bike was running. I must assume that it's running alright other than your concern that it may be running lean due to your fuel mileage. You're mileage is about nornal for an engine as large as yours. My 1340 Evo gets about 45 miles per gallon. If you had a vacuum leak on the manifold seals, you would notice it mostly at idle speeds. The idle speed would probably vary considerably while sitting still. It may even cause one cylinder to miss. As long as your bike seems to be running good, ride it and enjoy it.

Ride Safe
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Sounds like it sat allot.. That causes problems with the carbs.. I would say it runs pretty good for sitting so much.. I would suspect the carbs need cleaning.. or maybe rebuilt,, jetted and synced.. Try some carb cleaner and work you way up from there..

Rate well ;o)

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Dies in mid-ride


I HAD THIS PROBLEM. BIKE WOULD START AND IDLE NO PROBLEM. WOULD GET UP TO SPEED AND DIE. WOULD START AFTER SITTING. BIKE HAD BEEN SITTING FOR A PERIOD.

FIX:: REPLACED FUEL FILTER FIXED THE PROBLEM.

LOCATION::: TUCKED UP ABOVE VOLTAGE REGULATER RECTIFIER IN FRONT OF REAR TIRE LOOKING UP.

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