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Yamaha 85aet missfire

Yamaha 85 aet 3cyl missfires on no1cylinder have fuel and spark

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  • 302 Answers

Try setting the timing

Posted on Dec 30, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Yamaha YZ 80 Not Starting

has this bike been winterized with fuel stabulizer?

has this bike got enough compression?

is the oil injection working?

yes reeds are slighly opened
if tamper with
will loose - acceleration - top end power

Posted on Mar 31, 2009

  • 82 Answers

SOURCE: my yamaha blaster will start and idle once i press

Your mid and or hi speed jets are plugged. Drain the fuel (tank and carb). Dissmantle the carb, remove the jets and clean them. (Or soak the in carb cleaner over night).

Fuel turns to varnish in just a few months.

good luck

Posted on Apr 30, 2009

  • 1 Answer

SOURCE: 83 yamaha tt600e no spark

The CDI unit on the 83 model (TT600) is located under the fuel tank and suffers from heat
exposure.The solution is to get specialist help to open up the sealed CDI unit and repair/
replace internal connections (which are readily available electronic components)
When you re-install it put some heat shielding material there to protect it and this
will be OK as repair will utilise stronger parts,I think.
Later models have the CDI unit moved to the head-stem area.

(this info from a Non-mechanic who remembers what was done to his TT in Australia, many years
ago)

Posted on Jun 12, 2009

  • 68 Answers

SOURCE: how do you replace the spark plugs on a 2004 Yamaha Siverado 1100

Lift the back of the tank up and prop it up. Remove the chrome beauty covers, find spark plug wires and remove. Blow out with air first. Chaz Moto DC

Posted on Jan 22, 2010

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jamesflower9
  • 14 Answers

SOURCE: Fuel pump on a yamaha neo's ? (sorry cannot find model in scroll)

No its a scooter, only the carb.

Posted on Feb 23, 2010

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Missfire low rpm


This is often due to bad/old fuel or water in fuel.

Oct 31, 2013 | Yamaha Motorcycles

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Has a missfire


tune carb time, check fuel filter, bad gas.

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2001 XJR 1300 MISSFIRING,WAS FINE,GOT SPARK ?


Hi, Frank and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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 damaged, contaminated, sticky float, plugged jets.
13. Fuel filter clogged.
14. Old or contaminated fuel.
15. Fuel tank vent system plugged or carb vent line closed off.
16. Gas cap diaphragm valve faulty.
17. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
18. Carburetor controls misadjusted.
19. Incorrect valve timing.
20. Valve springs floating, weak, or broken.
21. Damaged intake or exhaust valve.
22. Incompatible performance parts.
23. Check for engine trouble codes.
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.
http://www.yamahaxjrownersclub.com/phpBB3/viewtopic.php?t=45287
Engine Missfiring At 1500 1750 Rpm Engine Carbs
Yamaha XJR1300 99 Service Manual
OEM parts for Yamaha
Yamaha XJR1300 Owner Manual

Nov 10, 2012 | Yamaha XJR 1300 SP Motorcycles

1 Answer

Yamaha R1 2003 missfire at low revs sometimes cuts out run ok at 4000 rpm


Hi, Tom and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
18. Check for engine trouble codes
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.
https://forum.motorcyclenews.com/topic/37173/r1-03-rough-running-and-stalling/2
http://www.r1-forum.com/forums/104-04-06-r1-mechanical-help/333978-rough-idle-knocking-engine-cutting.html
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
https://r1videos.files.wordpress.com/2011/04/2002-2003-yamaha-r1-service-manual.pdf

Aug 16, 2011 | Yamaha YZF-R1 Motorcycles

1 Answer

FZR 1000 EXUP missfires above 4500 rpm exup has been welded open any ideas


Hi, Paulo_maryon you need to repair to operational condition your EXUP valve and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. 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.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have nice a day.
Misfire frustrating the hell out of me The FZR Forum
https://yamahaclub.com/forums/topic/14532-fzr-1000-exup-misfire
Exup1000 co uk Tech FZR1000R
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Jun 28, 2011 | 1989 Yamaha FZR 1000

1 Answer

When riding my bike is missfireing and boggs out


First thing put a new spark plug in and see if that improves how it runs. then if it dosent improve i would look at your carb next, also look at what your spark plug looks like should be brown not black or gray.

May 23, 2011 | 2002 Yamaha TT-R 125

1 Answer

Yamaha xtz660 missfire at about 3500 to 4000 revs, could this be an air leak? as it is fine at idle .


it could be just a set of new spark plugs needed or the coil packs braking down even the ecu can cause a missfire,,, the only real way to find this in one go is on a rolling road test hooked up to tuning gear

Mar 03, 2010 | 1996 Yamaha XTZ 660

1 Answer

Spark plug order


If you are sitting on the bike, cylinder 1 is on your left then 2,3,4....looking at the coils, the left coil- left lead goes to no1cylinder. right lead goes to cylinder4. Right coil- left lead to cylinder 2, right lead to cylinder 3.
Hope it helps you.

Apr 03, 2009 | 1986 Yamaha FZ 600

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