Question about 1982 Honda CX 500 B

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I have a honda cx500 and i keep geting fuel in the oil. I have rebuilt the carbs and the pitcock seems to be working.

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  • jjdevl May 11, 2010

    Are you positive that what is in the oil is gas, or could it be coolant ? Is there gas in the airbox, or the capped, 1/2" drain tubes down near the center stand ?



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  • 2,050 Answers

Sounds like a float still sticking. Does fuel drip from the petcock when off, and the fuel lines off of it?

Posted on Jul 17, 2009


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1 Answer

Cx500 carb rejet

Once you remove the fuel bowl on the bottom of the carburetor and remove the float, you will see the main jet which looks like a brass screw with a hole in it. They just screw out and there will be a number on the side of the jet indicating the size.

Jun 30, 2013 | Motorcycles

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I need carburetor help for a 1980 Honda CX500.

For parts the best place to look is David Silver Spares, if they don't have it then there is a good chance it isn't available. To synchronise the carbs you will a set of vacuum gauges. They aren't expensive and they come with instructions.

Aug 22, 2012 | Honda Motorcycles

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Synchronize the carburetors on a 1980 Honda CX500

Hi, Steven for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one.
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.
Synchronizing CX500 carburetors
cx500 carb balancing part 1
Amazon com AlphaMoto Universal Motorcycle Vacuum Carburetor Synchronizer...
Honda CX500 Service Manual right click the chapter you want and save as

Aug 22, 2012 | 1980 Honda CX 500 A

1 Answer

Fuel leak cx500

there are orings, you need to unbolt the carbs apart. you might have to synch the carbs afterwards. you might as well try and get a rebuild kit and clean all the jets and replace all the rubber parts in the carbs.

Mar 20, 2012 | 1981 Honda CX 500 A

2 Answers

Hi I saw the advice you gave to a gentleman who is looking to buy a 1979 Honda CX500. I am a new rider and I have one but it backfires. I had the carbs rebuilt but it still does this. As I accelerate it...

backfire can come out carb or exhaust--could be runnin to rich-is the float level set rite-jets may be wrong too--1st chec spark plug quality-wires-coil etc for correct fire--but since it kiks in then probly the high speed jet is fine

Mar 09, 2011 | Honda CX 500 A Motorcycles

1 Answer

1980 Honda CX 500 A will not idle

Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
13. Faulty auto choke or wiring connection.
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.
Won stay running
cx500 carb balancing part 1
Honda CX500 Shop Manual
Honda CX500 CUSTOM Owner Manual

May 10, 2010 | 1980 Honda CX 500 A

1 Answer

1980 honda cx500 custom, when traveling at 55 mph and you want to go faster , it just flatlines and will not increase in speed, also the right plug gets black with oil after a couple of miles. the carbs...

Do a compression test on the bike if the psi in any cylider is below 100 psi the motor needs a ring job or valve job or both, the way to determine which engine component is weak (a leaking valve or worn piston rings) is as follows with an oil can squirt 2 or 3 times into the low pressure cylinder after noting the dry compression reading with no oil, if the compression reading increases more than 10 psi it is worn piston rings if the reading hardly changes at all it is a burnt vavle. If compression checks out ok the problem is either weak spark for that cylinder with the black plug or excessive gas or flooding from the carb.

Aug 14, 2009 | 1980 Honda CX 500 B

1 Answer

Gas in oil - Yamaha Virago 250 2006

your carb. is flooding the cylinder when its not will cause ring damage.turn your gas pitcock off when not in use.get carb cleaned &adjusted.

Apr 23, 2009 | 2002 Yamaha Xv 250 Virago S

2 Answers

78 honda CX500 will not go past 2500 rpm

Sounds like the stator to me. Thats a common problem on these bikes. They are about $200 and are in the rear engine cover. Pain in the ****!

Apr 06, 2009 | 1980 Honda CX 500 A

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