Question about Yamaha YZF-R125 Motorcycles

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1986 yamaha big wheel 80

I have spark fuel but it will not fire spark is a little week but not bad what else might be wrong

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  • cookiensprog May 18, 2009

    i have the same problem bud but cnt see what is wrong i have changed the spark plug but still the same i think the stater plate me be causeing the problem but not sure

  • douggable May 19, 2009

    i have the same problem with my 1988 yamaha dt 200 2 stroke i still dont have a solution

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I believe the spark is too week, high tension sparks should be crisp fat and blue with a hint of orange, a weak spark could be the result of a faulty ignition generator or coil, sometimes the spark is controlled by a Capacitor, when these break down the spark will be out of 'Kilter' the Yeti... also check main and starting jets as well as any fuel diagrahms, good luck the YETI

Posted on May 21, 2009

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Posted on Jan 02, 2017

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1993 YAMAHA BADGER CRANK NO FIRE, HAVE SPARK FUEL IN TANK, SPRAYED EITHER IN CARB NO FIRE


Hi, Jay only thing left is timing and compression otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm needs a 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.
Badger wont start
ATV Connection
Yamaha Badger 80
http://www.maultechatv.com/techguides/Service%20Manuals/YAMAHA/Kodiak%20YFM400%2093-95.pdf

Jul 14, 2016 | Yamaha Motorcycles

1 Answer

Flooding not firing


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
8. 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.
9. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
10.. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
11. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
12. Faulty neutral, clutch lever, or kickstand safety switch.
13. Faulty fuel pump fuse or relay.
14. Security alarm needs a reset.
For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have a nice day.
http://www.starbikeforums.com/forums/11-general-bike-talk/5968-fuel-flooding-cylinder-head.html
http://www.yamahasupertenere.com/index.php?topic=14660.0
http://www.yamahaventure.nl/pdf/servicemanualxvz13tf.pdf
OEM parts for Yamaha
http://www.yamahaventure.nl/pdf/ownersmanualxvz13tf.pdf

Apr 03, 2014 | Yamaha Royal Star Venture Motorcycles

1 Answer

Cutting out on a cylinder until revved up to 3500rpm..1986 virago 700


Hi, Anonymous 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 links below. Good luck and have nice a day.
ViragoTechForum com Yamaha Virago XV Forums That Rock
Probable Solution to the Firing on One Cylinder Issue 50MPH at WOT No More
http://service.tanga-moteurs.ro/data/yamaha_virago_535_700_1100.pdf
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xv-owners-manuals

Jan 14, 2014 | 1988 Yamaha XV 535 Virago DX

1 Answer

1999 Yamaha Kodiak 400 4X4


Is it a fat blue spark, Is it good fuel, have you done any recent work that might have cause this problem. If you have a small bottle that you can put a little bit of fuel into. Remove the spark plug put the fuel into the spark plug hole. install the plug back into the hole, make sure not to spill any fuel , if so clean a dry the fuel. Try to start, if it fires and runs for a bit it is a fuel issue. Just because you have fuel to the carb doesn't mean there aren't problems with the carb. There should be a drain screw on the bottom of the float bowl. remove it , is the clean fuel coming out. this is a good place to start.

Jun 08, 2013 | 1986 Yamaha RD 350

1 Answer

Firing order diagram for 1987 yamaha fz600


Hi I have a 1986 Yamaha 600 FZ that only spark from plugs 2 and 3. And on plug 1 and 4 I have no spark if I swap the connection from the othe coil pack 1 and four has spark could this be the cdi box going bad. I clean all ground point and connection still te same what could it be?
2_17_2016_3_28_30_am.jpg

May 08, 2012 | 1987 Yamaha FZ 600

1 Answer

Hi i have a 1986 yamaha rz 250 and both spark plugs are firing outside the engine, earthed out but when inside the engine one fires and other does not?


change both plugs so you know they are good ,& caps & ht leads to coils, have you changed the jetting in the carbs, check & put back to standard , are carbs working ok , could be flooding on one side if needle jet is in wrong possition or jamming up, does non firing plug come out wet?

Jan 09, 2012 | 1986 Yamaha RD 350

1 Answer

1984 Yamaha XT125 got lots of spark,wont fire,put a little fuel down spark plug hole ,still nothing


yes buddy to much fuel in the barrow wont fire it. all your doing is flooding the plug just do 2 drops and get back to me

Sep 15, 2009 | 2005 Yamaha XT 125 R

1 Answer

Hello, I have a YZ 80 and i was wondering why my


Look at ?

crank seal (drawing air)

ring wear

main jet (blocked jet's)

fuel starved carb

Jul 15, 2009 | 2003 Yamaha YZ 125

3 Answers

1986 Yamaha Radian stops running after 20 minutes


Sounds to me like it could be a few things... pretty interesting that it runs and shuts down...sits for a little while then fires back up. Could be something as simple as a bad ground.. maybe it needs cleaned.. if the ground is making very little contact.. the bike would run bad, and because its direct current it has to flow. The metal in the motor frame etc will hold so much DC current.. but *** soon as it load up the bike would stop sparking. Let it sit for a while, DC trickles into the battery through the slight contact, bike fires back up. OR could be bad venting of your fuel tank, or a partial clog at the pet ****.. the first is pretty easy to check, open your fuel cap and start the bike..if it does the same thing then its not a vent problem. One thing that does happen on the Radian, is the reserve fuel screen inside the tank comes loose, and then everything inside the that has built up over the years either partially clogs the pet ****, or the hose, or both. Take the tank off, pull the pet **** off..if it still has two intact tubes with good screens..you probably don't have any junk in your line..but I would pull the line off and blow through it any way... it could be some type of blockage, when the bike sets the fuel seep through, but when it runs it eventually creates a vaccuum that stops the fuel flow. Those are my two first thoughts... good luck!!

May 27, 2009 | 1987 Yamaha YX 600 Radian

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