Question about 1988 Yamaha XJ 600

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My FZR 600 is acting up and backfires

Ok well My FZR 600 I just purchased was running great once I cleaned the carbs. out.. Then started running like **** when it would hit the 9,000 rpm range so I pulled the tank off and and found a screw blocking the petcock valve.. Then the bike ran great but now its doing the same thing and sputters around 8,000-10,000 rpms and doesnt have the power anymore.. Can anyone help with this the power coming from the bike is off and on.. Bike has new fuel filter, but needs plugs and carbs are very clean just need to be sync alittle but other then that what could it be??

Posted by on

  • billf6905 Feb 01, 2009

    O and also what could I do to the bike to make it sound better I mean when you hit the throttle it sounds good but when deceleration at a high speed and downshift it starts popping and makes like a gargaling noise.. Any suggestions?

  • tony_brame May 05, 2009

    i to am suffering from the exact same problem, i have brought a new set of plugs but havn't fitted them yet. i no the carbs are ok because its only covered 1,000 miles since they where cleaned out and retuned by a carburettor specialist. i will let you no if the plugs make a difference, this problem only occurs for me when my engine is at maximum temperature.



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I have had several bikes in my time. and keeping the carbs syncranized is very important. Did you put aftermarket pipes on it? try rejeting the carbs up 2+mm that may help the fuel air ratio?

Posted on Feb 01, 2009


    also check your coil pack that may be faulty as well.



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Mar 18, 2014 | 1993 Yamaha FZR 600

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I just got a bike and it needs alot of work how do i clean the carbs out


Jun 14, 2013 | 1990 Yamaha FZR 600

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Seems like carbs are flooding lots of gas and wont run right

Hi, Anonymous 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. Intermittent short circuit due to damaged wire insulation.
8. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Fuel tank vent system plugged.
11. Throttle body controls misadjusted.
12. Damaged throttle body or intake seals.
13. Loose, dirty, or corroded ignition module connector at crankcase.
14. Faulty MAP, CKP, O2, and/or CMP sensors.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. 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.
Hard start Backfires The FZR Forum
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Apr 08, 2012 | 1989 Yamaha FZR 600

1 Answer

My 89 fzr 600 @4.5000-5.000 rpm backfires. im new to road bikes and need help. cheers lads!

Too much fuel is getting through the carbs. The carbs either need setting up properly or the correct size jets refitting.

Jul 28, 2011 | 1989 Yamaha FZR 600

1 Answer

I bought a 97 fzr 600 with 1100 miles but it wont start. I have Spark Fuel and good compression. I replaced the Stator, Carbs are clean. Engine head is clean. It sounds like its going to start but just an...

i have the same bike and had same problem mine was fuel pump so with that said pull off the gas line and turn on key it should keep spraying out if only a little spirt comes out its bad make sure to also check filter i hope this helps you please give me good feed back thank you

May 23, 2011 | 1995 Yamaha FZR 600

1 Answer

'96 fzr 600. Bile has not been started in two years. I have removed the carbs but before i clean them, any advice? I've removed the tank, and cleaned it already, now the carbs. I've been maintaining...

do one at a time use proper carb cleaner, lay the bits out carefull on a clean bench or table then you can rebuild it from the ones you have left together.

Mar 21, 2011 | 1995 Yamaha FZR 600

3 Answers

Fzr 600 got killer spark pulls fuel valves in check wont start just turns over once in a while it while spit through the carbs or backfire through pipe few and far between carbs are clean plugs are new...

This is not the news you probably want to hear but backfiring thru the carbs when you have good spark can be one of 2 things... either the valves are sticking / not closing properly due to carbon or the cam timing has shifted from the original position.

It would be best to do a compression test. You should have a minimum of 100 PSIG for an engine with major problems and up to 150 for a healthy engine. If you can not get 100 PSIG then it will be time for some serious engine service.

There is a possibility of the kill switch wire in the handle bar grip grounding under the grip to the handlebar but, since you said you have killer spark I doubt this is your problem.

Thanks for using FixYa.


Jun 10, 2010 | 1991 Yamaha FZR 600

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