Question about Honda CM 125 C Motorcycles

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1982 honda CM 125 Custom runs on one cylinder.

1982 honda CM 125 Custom, only runs on one cylinder, even when plugs changed over. have replaced the cdi unit and coil. still only running on one.@

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  • Honda Master
  • 43,690 Answers

Hi, Angela you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue. Multi carb banks should be bench "SYNC"
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes, multi-cylinder engines should be within 10-15% of each other if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or its counterpart for integrity.
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://myfilestore.com/download.php?id=9c22edb1
honda cm 125 running intermittently on one cylinder
One cylinder not firing
http://www.historicmotorcycle.org.au/Honda/CD125/HaynesCD125.pdf
http://www.partsfish.com/page/oem-parts-for-honda
Honda CM250 Custom Owner Manual

Posted on Oct 20, 2017

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Posted on Jan 02, 2017

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  • 3567 Answers

SOURCE: Ignition Coil for Honda 125 CM /84

The 12v coil on a 6v system will only give a weak spark at best. The coil in the photo should work very well assuming the wires are long enough. Any 6v twin coil should work. If you fit another coil and the bike has spark but will not start, swap the wires at the points. Don't purchase a condenser unless the old one has gone bad. If needed, get a 6v condenser matching the old one.

A “very helpful” rating for this answer? Thanks from Dallas Texas!

Posted on Jun 16, 2009

czaa
  • 4536 Answers

SOURCE: I have yamaha xt550 1982 with a cdi electrical

take the cdi off and inspect it youll need a book by haynes or clymer @ a Borders be careful with the timing!

Posted on Jul 31, 2009

  • 31 Answers

SOURCE: 1982 XJ 650 maxim cylinder 2 & 4 won't run

Are you saying that 2 & 4 got gas with external tank but not with gas tank? If so something else has happened ,if gas is getting to the carb it cannot by-pass 2 to get to 1. Take the tank back off ,connect to external, again. See what happens.

Posted on Sep 11, 2009

  • 143 Answers

SOURCE: My 1985 Yamaha V Max in not firing on the front

check all earthing connections on the ignition system and in fact on the whole cycle. A loose or dirty connection may be the cause.

Posted on Sep 17, 2009

  • 1 Answer

SOURCE: 1997 Yamaha Kodiak 400, hard to start, once you

I would follow the fuel line all the way check the filter it should be inline and check the pump as well i would say its one of them two.

Posted on Jun 21, 2010

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1982 Honda cb750c no spark on 3 & 4 cylinder


Hi, Richard and the usual suspects are:
1. Fouled spark plugs.
2. 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 preliminary 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.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
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1 Answer

2000 Honda CM 125 C weak spark


Hi, Mario67 and the usual suspects are:
1. Fouled spark plugs.
2. 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 preliminary 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.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Tilt sensor needs a reset.
11. Security alarm failing to disarm needs reset
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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How to diagnose no spark situation on motorcycle
http://www.guside.com/honda-cm-125-service-manual.pdf
https://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda

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1 Answer

2002 Honda CM 125 C only running on one cylinder


Hi, Martin you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue. Multi carb banks should be bench "SYNC"
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes, multi-cylinder engines should be within 10-15% of each other if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or its counterpart for integrity.
For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
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https://www.partsfish.com/page/oem-parts-for-honda
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Your XL125 ignition system is designed to run off of battery power. You can remove all the lights but need to leave the battery, regulator, rectifier, and appropriate wiring in place. It is not designed to run like an ATC 110 (no battery) or a 2 stroke where you can run a single wire to a kill switch and down to the coil to power the spark plug. Put the harness, the regulator,the rectifier,and the battery back in and you should be in business.

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Check your standard factory specs for spark plugs, it sounds like ur bike getting OVERHEAT!

Did you happen to check the over head valve camshaft? Ussually that bike , w/ age happen to be more tha 10 yrs old, cam shaft, valve guide are worn out and out of clearance! Check it please!

Hope that make your bike be reliable again!

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3 Answers

1986 gsxr 400.not sparking r starting


Hi and welcome to FixYa,

If somehow, the CDI could be opened up, then component level repair maybe tried. There would be 2 final transistors that actually do the switching; 1 for each coil. Offhand, it would appear that 1 of those 2 is faulty. Otherwise, replacement is the only option.

Incidentally, in some versions, a fault in the tachometer could also cause one of the CDI's output to fail.

Postback results of tests.

Good luck and thank you for using FixYa.

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