Question about 1981 Honda CX 500 A

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Runs up fine no load,20% power under load.cx500.

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Posted on Sep 07, 2009

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Troubleshooting generators


If this unit dies under load conditions, decrease your load and try it again.
If this happens under no-load conditions, check your fuel supply. Start with the filters, then check pressure and flow.

Jul 21, 2014 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

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

2 year old TS410 no power recently, was serviced , correct mix but dies when pressure comes on ,blade stops, starts fine and runs idle fine-tom


Hi Thomas its probably had its high/low screws reset and whilst it runs fine on the bench under load its running weak try unscrewing the high screw out a half a turn

Aug 16, 2013 | Stihl Ts 410 420 Cut Off Saw...

1 Answer

My chainsaw starts and runs fine. After a short time cutting it starves for fuel and cuts out. It will still idle. The carb has been rebuilt and no change.


Take it back to whoever did the carb work. There are two jets on those, an idle jet which can be adjusted for idle speed, and the power jet that kicks in when the saw is under work load. You still have a problem with the power jet, either needs adjusting 1/4 turn at a time until the saw stops killing under load, or the jet and assembly is bad.

Apr 06, 2013 | Makita DCS6401 20 20",64cc Chainsaw 2...

1 Answer

1980 cx500 doesnt want to start


Hi, Darek I would be looking really hard at your starter motor otherwise the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the enrichner.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. 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.
14. 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.
15. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
16. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
17. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
18. Faulty neutral, clutch lever, or kickstand safety switch.
19. Faulty fuel pump or fuse or relay.
20. A stuck bent or burnt valve.
21. Tilt sensor needs a reset.
22. Security system not disarming alarm needs a reset.
23. 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.
Cx500 won start
Starting Problem with 1980 Honda CX500
Honda CX500 Shop Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CX500 CUSTOM Owner Manual

Aug 17, 2017 | 1980 Honda CX 500 A

1 Answer

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

1 Answer

On my 9 hp onan genset it runs fine but the 20 amp breaker on makes it shut down is there short or abad breaker


To determine if it is from the breaker use a

Tong Tester


These would indicate what current is being consumed by the load.

Jun 28, 2012 | Watts Onan Portable Generator - 5000 ,...

2 Answers

It starts fine, runs 20-30 seconds, runs rough,


check the actual fuel line. Also is it fuel injection or carberator

Aug 03, 2009 | 1992 Dodge Power Ram 50

1 Answer

Husky 455 dies out at full throttle or under load


Your carb may be the issue but your ignition coil could be the culprit. Once they start going bad, they can act up intermittently or give various symptoms from day to day. The fact that your saw dies at full load or under load, probably means that when your saw gets hot or requires more spark, your coil is not able to provide it. Your carb is easy enough to clean out, you can take it all apart and clean all screens, etc....

I just replaced my coil due to the exact same symptoms and now my saw runs great. $60 off ebay and you can put it on in 15 minutes yourself. Check your carb first though

Apr 13, 2009 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Truck runs fine with no load. try to tow my boat or camper truck looses power and lugs. 1995 s 10 v 6


have the fuel pressure checked. and when was the last time you gave it a tune up? spark and fuel/filter. i say fuel because under a load it requires a little to a lot more and if the filter hasn't been changed, it may not be able to get what it needs to do the job.
have you noticed any hesitation without a load( are you sure the truck runs fine with no load?).

Sep 19, 2008 | Chevrolet S 10 Cars & Trucks

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