Question about 2003 Yamaha FJR 1300

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YAMAHA FJR 1300 MISFIRE

The bike has a misfiring sound immediatleyright through the gears, but plenty of power, misfire is very intermittment when rev slowly and hold at revs gives of this blipping noise, misfire?

Posted by Anonymous on

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  • Yamaha Master
  • 44,650 Answers

Hi, Anonymous 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.
2007 FJR1300 Low speed misfire
Engine Misfiring Engine Carbs
Yamaha FJR1300R Service Manual
OEM Parts for Kawasaki
Yamaha FJR1300R Owner Manual

Posted on Feb 05, 2017

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Posted on Jan 02, 2017

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  • 89 Answers

SOURCE: intermittent misfire/loss of power at higher revs..

how are your intake and exhaust valves? are they set to specs? my racing quad use to do that. so i set the valves to spec and whala!!!!better than ever.

Posted on Mar 26, 2009

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sounds like a wire is off at the battery the positive side should have two leads and check the ground wire to the bike make sure it is clean and tight

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Hi, Darrell_kauf and the usual suspects are:
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Bike starts to miss fire at about 80 miles an hour, have changed everything electrical still no luck removed carb found a joint for water pipe broke could this cause the miss fire?


Looking at this problem laterally rather than logically, what if the pipe leaks when the bike is working and just happens that the air intake ingests the water at high speed. That would make it misfire.
Does it misfire due to revs or speed?

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how are your intake and exhaust valves? are they set to specs? my racing quad use to do that. so i set the valves to spec and whala!!!!better than ever.

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1 Answer

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Hi wayne

Not knowing what you have checked or done already, I would first remove the spark plug from the bike and check it fir a carbon deposits. If it has not had a new one for a while, Just get a new one and replace it. Before I drop the oil for a service(as it can dirty up the oil), I also like to run a fuel system cleaner additrive(I use a Nulon product) to my bikes every few thousand kays, just to keep everything tip top. If you still have misfire problems, then it will most likely be a faulty sparkplug cap, ignition lead or other ignition part. Change out/clean spark plug with a wire brush first. I think that will fix it for you. If you still have problems,happy to talk to you more about it.

regards
robotek

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