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1981 honda cx500 spark plug gap - Motorcycles

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SOURCE: spark plug gap

it is 0.036 in

Posted on Nov 10, 2008

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Cx500 deluxe I have 152psi of compression in both cylinders I went through the carbs, I even replaced the fuel pet **** diaphragm the bike runs great until about 55 mph


Hi, Daniel and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
a. Faulty high-speed coil and or stator
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Loss of power
http://www.australiancx.asn.au/forum/index.php?topic=9437.0
http://www.motorcycleforum.com/showthread.php?t=82231
Honda CX500 Service Manual Honda GL500 GL650 Service Manual
http://mybikemanuals.com/honda/honda-cx-owners-manuals

May 17, 2016 | 1981 Honda CX 500 B

1 Answer

1979 Honda CX 500 A misfires badly


Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system.
12. Carburetor contaminated, sticky float, plugged jets.
13. Carburetor vacuum diaphragm torn, cracked, not seated or installed improperly.
14. Multiple carburetors out of sync.
15. Fuel filter clogged.
16. Old or contaminated fuel.
17. Fuel tank vent system plugged or carb vent line closed off.
18. Gas cap diaphragm valve faulty.
19. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
20. Carburetor controls misadjusted.
21. Incorrect valve timing.
22. Valve springs floating, weak, or broken.
23. Damaged intake or exhaust valve.
24. Incompatible performance parts.
25. Control module may be in "LIMP" mode
26. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Honda CX500 Ignition Problems Tech Corner Motorcycle Classics
http://robdavistelford.co.uk/webspace/cx500/wontgo
Honda CX500 Shop Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CX500 CUSTOM Owner Manual

May 24, 2014 | 1979 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

1 Answer

What is part no for cx500 custom 1981 synthetic bung washer for spark plug drain hole


The rubber oil gasket that keeps oil from pouring past the valve cover onto the spark plug is part number 12329-415-000.

Dec 29, 2010 | 1982 Honda CX 500 B

1 Answer

How do i remove the seat on a 1981 Honda cx500?


The deluxe model has two latches one on either side of the seat, if you flip both levers at the same time and lift, the seat will come off. The custom model has two bolts that hold the seat down, near the back, one on each side. Remove the side covers, take off the seat bolts and lift the back of the seat pulling toward the rear of the bike.

Sep 06, 2010 | 1981 Honda CX 500 B

1 Answer

1981 CX 500 B: 1981 Honda CX500 idles at about 2500 rpm. How to ...


under the carbs there is a little black screw turn this by hand anti clockwise until 1-1500 revs if this doesnt work the choke may not be going all the way off or pilot screws under float bowls in recess been adjusted too far screw gently all the way in DO NOT over tighten then unscrew approx 1.5 turns out on both carbs if your experiencing flooding from carbs the bowls need to be removed and the pilot jet attached to the float needs replacing hope this helps steve

May 17, 2010 | 1981 Honda CX 500 B

1 Answer

Need to lower


try a cut down seat instead.

Sep 01, 2009 | 1981 Honda CX 500 B

1 Answer

1981 converted to points, whats the point gap? and and the spark plug type and gap?


Point gap is about .018" if you can get the
timing aligned there. If not, vary the gap
slightly.
Spark plug is NGK BPR5ES-11 with a .022"-.025" gap.

Electronic ignition plug gap is much larger at .040"

Aug 20, 2009 | Harley Davidson FXDWG Dyna Wide Glide...

1 Answer

Honda cx500 only fires on 1 cylinder


Gary,
Pull the bowl from the left carb and remove and clean the float needle and jet. It sounds to me that this passage is plugged. You might as well clean the whole set since you have it off.
It is a common problem for those carbs on the older bikes for the jets to plug up from old gas, or material such as rust in the tank. Check your fuel filter if you have one. If not I would suggest you install one when you are done.

Mar 11, 2009 | 1981 Honda CX 500 B

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