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No spark at spark plug on my 1979 mx175 Yamaha

No spark

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Blowing spark plugs

does anyone know how too work on a 04 ducati749s????

Posted on Jun 09, 2009

  • 3799 Answers

SOURCE: 1979 yamaha enduro 50cc 2 stroke fouls plug quickly. I am not using proper jet needle. Can't find one. Is this one reason plug is fouling?

More than likely, a 2 stroke engine is very picky about the fuel mixture. Try and find a new one. there is a DT owners club and most club trials riders will be able to tell you where to find one. Or try "Wemoto" on the web. they may have the bit you are looking for.

Posted on Mar 17, 2012

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1 Answer

Why does my 1979 yamaha xs 750 special have weak fire?


Hi, Karin and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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 CDI box.
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, pick up coil, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
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.
http://www.xs11.com/forum/showthread.php?t=4451
Viewing thread 1979 Yamaha XS750 Special will not start
http://www.yamahatriples.com/files/5613/2786/4749/Yamaha_XS750_Service_Manual.pdf
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jun 28, 2014 | Yamaha XS 650 SE Motorcycles

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What is the correct spark plug wire placements from coil packs?


yes i need to correct spark plug wire to the coil doger grand caravan 1997 3.3

Apr 18, 2014 | Yamaha 1978-1981 1979 Xs1100 Stator...

1 Answer

1978 Yamaha GT 80 no spark


Hi, Greddytuner8 and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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
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.
1979 Yamaha GT80 MX not sparking
http://www.doityourself.com/forum/motorcycles-snowmobiles-go-carts-motorized-bikes-atvs-electric-mobility-scooters-golf-carts/407995-yamaha-gt80-no-spark.html#b
DOWNLOAD NOW Yamaha GT80 DT100 GT 80 DT 100 77 82 Service Repair Workshop...
OEM parts for Yamaha
http://www.cmsnl.com/yamaha-gt80-1980-usa_model8683/partslist

Jul 10, 2012 | Yamaha Motorcycles

1 Answer

Trouble shoot


Hi, Brian 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.
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 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 it's counterpart for integrity.
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.
Runs on only one cylinder
1980 Yamaha XS400 Special Only firing on one cylinder
Yamaha XS 400 SH Service Manual ENG XS360 2D XS400 2E 2F SG Supplement ENG...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Apr 08, 2012 | 1979 Yamaha XS 400

1 Answer

What is the firing order for spark plugs on a 3 cylinder 750 special yamaha?


if u wanna become a mechanic-u need a repair manual---------

Jul 09, 2011 | 1979 Yamaha TX 750

1 Answer

1979 Yamaha 650 Special no spark


Hi, Fbigtank81 and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, needs to be 12.5 volts or more and be able to pass a proper "LOAD" test, your battery may show 12.5 volts or more but has little or zero amps causing the battery to be faulty and must be replaced, AGM batteries fail in this category 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
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.
79 xs650 Special No Spark But 12v help
How to diagnose no spark situation on motorcycle
Yamaha XS650SE Shop Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jun 30, 2011 | Yamaha XS 650 C Motorcycles

1 Answer

1979 Yamaha XS1100 no spark


Hi, Aultman3 and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, needs to be 12.5 volts or more and be able to pass a proper "LOAD" test, your battery may show 12.5 volts or more but has little or zero amps causing the battery to be faulty and must be replaced, AGM batteries fail in this category 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
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.
http://www.xs11.com/forum/showthread.php?t=15191
How to diagnose no spark situation on motorcycle
http://www.ringler.us/xs1100/XS1100H-SH-LH_Service_Manual.pdf
OEM parts for Yamaha
Yamaha 1979 XS1100E Owner Manual

May 18, 2011 | Yamaha Motorcycles

1 Answer

I have a 1979 yamaha 340 enticer.Recently it would not start, no spark. I tried new plugs and a new ignition coil but still no spark. Don't know what to do next.


Hi, Gmgroot and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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.
6. Faulty ignition coil or ignition / electronic module
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Security alarm failing to disarm needs reset
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.
1999 royal venture no spark limited knowledge need help
https://www.tradebit.com/filedetail.php/55384194-yamaha-1983-1988-enticer-excell-340-snowmobile-service
http://vintagesleds.com/library/manuals/yamaha/1980/ET340_80.pdf
http://www.gearhead.com/snowmobile/parts/oem/yamaha.html?aribrand=YAM&s2=snowmobile

Feb 04, 2011 | 2000 Yamaha Royal Star Venture

2 Answers

Blowing spark plugs


I imagine you mean that the spark plug does not last very long before failing to work at all. I had this problem on a Honda CG125 years ago. Replace the condensor and that should see you right.

Apr 23, 2009 | Honda CB 750 Motorcycles

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