Question about 1978 Honda CX 500 A

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1978 Honda CX 500 A carburetor specs

I have a 1978 honda cx500 and I am building it into a cafe racer I want to put aftermarket chrome cap air filters on it instead of the stock filters. I found the air filters but it gives me like 3 sizes. I need to know what size carbs I have. I can not find anything online about them but jetting them. please help. thanks@

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Hi, TJ 28mm 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.
http://www.globalarray.net/user/mike_in_phoenix/motorcycle/text/specs_revised.html
Total Motorcycle Forums
Honda CX500 Shop Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CX500 CUSTOM Owner Manual

Posted on Nov 01, 2017

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SOURCE: honda xr600r cutting out at 3/4 & full throttle

when you put on a new air filter you have to rejet the carb in order for the air/fuel mixture to be correct,because with a aftermarket air filter it is allowing more air in than before and not enough fuel. as the piston speeds up upon exceleration the air is not getting burnt off into exhaust because you do not have enough fuel in the mix

Posted on Jun 03, 2009

  • 409 Answers

SOURCE: hi (.honda cb 400-4)

Were the jets the same size? Just because the numbers were the same does not assure you that someone has not used a jet drill to enlarge them. Pull the low speed jets and compare them with the old ones, using a wire gauge or set of number drills.

Posted on Apr 02, 2010

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SOURCE: i have a 2002 honda shadow 750 problem is that it

Check for exhaust leaks that could let cold fresh air into the pipes,test plug wires for ohms resistance, maybe replace plugs.Could it be one of your coils has a crack that only shows itself when chilled?(try to spray silicone on the suspect coil when it is missfires, if this helps stop it fron cutting out replace the coil.(maybe even go back to your prefered jets then) If a relay is weak they can be temperature sensative as well.

Posted on Apr 21, 2010

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Hi, Terry sorry you can't find the first and best tool you ever bought for your Honda despair not for a mere $10 you can download another one. For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day.1979 CB400T II removing the air box
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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.
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http://robdavistelford.co.uk/webspace/cx500/wontgo
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May 24, 2014 | 1979 Honda CX 500 A

1 Answer

Honda cx 500 overheating


Hi, Anonymous and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant and needs bleeding.
7. Engine idling too long or bike moving too slow.
8. Coolant too old needs to be replaced.
9. Faulty temperature sensor, wiring or connector.
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.
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Feb 10, 2014 | Honda CX 500 A Motorcycles

1 Answer

1979 Honda CX 500 A part numbers


Hi, Anonymous for this scenario you will need your service, 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.
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Jul 03, 2013 | 1979 Honda CX 500 A

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Putting a 1982 cx500 motor in a 1980 cx500d bike


Hi, Kevin "YES" it will and does, for this scenario you will need your service, 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.
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1 Answer

1980 Honda CX 500 A clutch torque specs


Hi, Jon for this scenario you will need your service, 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.
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Honda CX500 Service Manual right click the chapter you want and save as
https://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/honda-cx-owners-manuals

Feb 12, 2013 | 1980 Honda CX 500 A

1 Answer

1980 Honda CX 500 A misfires


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 for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Hi, Anonymous 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.
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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.
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