Question about 1981 Honda CX 500 A

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Turning over when fuel is manually injected into back of carb, bike starts fine but will not turn over regularly and when tank is on gas pours out...could it be a carb float problem?

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Yes buddy it is the floats just take the carb off unscrew the screws on the bottom off the carb so the bowl comes off once this is off inside you will see the float a pivot pin holds the float in you can either take this out and pull the float out then take the inlet fuel valve out and adjust the tab bend it up a tad and try this out get back to me if not ok turning over - f5484ec.jpg

Posted on Sep 27, 2009

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What should I check next? Not getting any error codes, replaced the CKP, MAP, IAC, TP, & ET Sensors. Not sure what I should try next, any suggestions would be appreciated.


Hi Bruce, might have gotten some bad gas. Drain the tank, clean the fuel filter, check the bottom of tank for rust, dirt, water ect. Then ckeck fuel pump pressure, refill tank with a gallon of fresh gas from a different source and take it for a ride. good luck

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1986 v65 Mag - will start with full choke only but will die as soon as you back the choke off or crack the throttle. Has fuel pressure and is warmed up. Last year it did the same thing but once it warmed...


You need to disassemble and properly clean the slow circuit/slow jets of your carburetors. Unfortunately, Your carb rack is very delicate. There are some brittle and expensive($40 each) crossover pipes that may crack or leak if the rack is removed for cleaning. I would try lowering my fuel level to just the lower tank and adding half of a cup of "Chevron Techron" to the gas (basically you want one gallon of gas with a shock treatment). Unplug the fuel line from the fuel pump and pour some Techron directly into the carbs. Now start the bike and run it long enough to make sure the treated fuel is in all the carbs. Turn off the bike and let it sit overnight. In the morning drain the carbs, restart the bike , and idle or slow drive till the carbs idle again( usually 5 to 15 minutes). If bike is starting to idle, drive to the gas station , fill the tank and drive the treatment through. With any luck this will solve your problem without an expensive disassembly/cleaning. Use "Chevron Techron", not Chevron fuel treatment with Techron, Techron is more concentrated.

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Will not idle


Your carbs are dirty and need to be cleaned. A tank of bad gas or old gas can gel up the jets. You buy gas, drive home, and when you get there the bike stops idling. Light gelling can be fixed by draining the carbs (screw on bottom of bowl), pulling the fuel line off the tank, and squirting some motorcycle carburetor cleaner down the fuel line. Plug the fuel line back in turn on the gas and start up the bike. If that doesn't work, using the same procedure buy some Chevron Techron fuels system cleaner, pour directly into the carbs and let sit over night (also drain tank and heavily treat one gallon of gas and put in tank) Fire up bike and let run ,idle, slow drive for 5 to ten minutes. This will usually get cycle idling without disassembling carbs. If it still wont idle you will have to take off the carbs, disassemble and clean blowing through the jets and jet passageways.

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If this is a carb. bike just turn the fuel petcock to off pos. Fuel injected remove left side side cover and locate fuel pump fuse start bike pull fuse bike will stall and try to start again this will depressurize the system turn key off and do not turn on again. then at the tank connection slide the connector ring up and pull the fuel line down and when you put it back together make sure you hear it click or snap into place locking them together Good Luck

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1 Answer

Corrossion in fuel tank . difficult starting.


For the corrosion in the fuel tank get a liquid tank liner. It lines the fuel tank walls then hardens to seal the tank from rust. Google “ kreem fuel tank liner “ or go to www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html

For the hard starting, clean the carburetors. (unfamiliar with your bike, I assume it has carburetors and not fuel injection).
ALWAYS have a fire extinguisher on hand when working on carburetors.
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 ).

Drain the carburetors. There should be a screw on the lower side or bottom of the CARB float bowls. Remove the drain screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carbs to fill with gas. Install new stock NGK spark plugs and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor 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. Remove the idle screw and the air screw on the outside throat of the
CARB and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
CARB back together, clean the air filter and install the CARB. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

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4 Answers

Engine stalls after running for 25 miles?


Sounds like a fuel or intake problem to me, start the bike and spray brake cleaner onto the intake where it goes into the head, if the bike stumbles then you have an intake leak and have to change the seals or just tighten up the intake manifold. Another thing you could do is remove the carb (if it is carburated) remove the float bowl and clean everything including the jets, you could have some **** in there that is plugging things up. Also try removing the air cleaner and spraying a can of carb cleaner into and around the carb. Also try removing the gas tank and completely cleaning it and the petcock screen out, you could have something in the gas tank that is migrating to the petcock and causing a blockage.

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1 Answer

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2 Answers

Gas pouring out of air filter


carb is gummed up from the old fuel turning to varnish and clogging the jets. while trying to start, its trying to inject fuel, but its clogged and taking the path of least resistance (coming out the air filter).

you'll need to drain the gas tank and remove the carb to clean it out. if unfamiliar or uncomfortable doing this, then take it to someone to do a carb cleaning.

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1 Answer

Engine runs, but it will not rev up past 2000-3000 rpms,


are you turning the choke off after its warmed up? most will not run with the choke on and warmed up.

also try running it with the gas cap open to see if you have a vent issue in your tank. if air can't get in, then gas can't flow.

if not a choke or vent issue, then try this. turn the petcock off and then disconnect the fuel lines one at a time going into the carb. start with carb fuel line #1 disconnected (and the rest connected) and in a coffee can, turn petcock on and ignition too. fuel pump should come on momentarily and inject some fuel. see how the quantity looks. reconnect the line to carb #1 and repeat for carbs #2 - #4. your looking for a decrease in fuel to a couple of cylinders.

if all looks fine, i would then focus on the carb floats & jets. have the carbs been off for a good cleaning lately? modern fuel breaks down quickly and could cause a gumming condition in the carbs. spraying the sea foam or carb cleaner into the carbs is bypassing the everything in the carb bowl (but it means the spark plugs are ok) so there could be an obstruction. i would look there first.

if uncomfortable removing the bank of carbs, you can try a quick fix first. with the petcock closed, open the drain screws of each carb and let the gas drain out. go and buy some yamaha carb cleaner (liquid in a black bottle) at a yamaha motorcycle dealer. mix it in a separate container with gas as recommended. close the drain screws on each carb. pour the mixture into each fuel line feeding the carb and let it sit overnight. DO NOT POUR THIS MIXTURE INTO YOUR TANK. its not a fuel additive, but a cleaner that will not harm orings or gaskets, but it will not ignite with a spark plug. open the drain screws the next morning and let the mixture pour out. reconnect the fuel lines to the carbs and test drive it.

if that didn't work, then removing the carbs for a good cleaning is my next step. good luck.

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