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??

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  • 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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1 Answer

93 fzr 600 r

poor spark , low compression , carbs clogged up fuel tap not operating correctly.

Mar 18, 2014 | 1993 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
How to Clean Motorcycle Carburetor the RIGHT way Evan Fell Motorcycle Works
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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

1 Answer

After cleaning the carb it backfires in the carb and exhaust now. I use started fluid to test bike to c if i got it running right.before i clean carb it running ok with starter fluid be spray in carb. but...

How did you celan the carbs?? Need to strip and dismantle all parts / blow out with compressed air / Check float adjustment etc./ reassemble, ensure there are no air leaks.

Mar 17, 2010 | 1996 Suzuki RF 600 R

1 Answer

Fzr 250 Wont rev when cold

Firstly clean the air filter.
and then the carb too needs cleaning.
You can use a good fuel addative to clean the carbs.
There is a YESI a tube that runs upwards from after the carbarator ... if there is any kind of leak in this you will need to change it immediately..
An advice...Pls dont ty to fix any leak on this using any type of solution, it ALWAYS backfires....


Jan 31, 2010 | 1987 Yamaha FZR 250

1 Answer

Bike won't start 92 yamaha fzr 600

Sounds like the plugs are fouled out, I would pull them and make sure they're about the color of a paper bag. If they're all sooty and wet you most likely have a rich condition. I would take the carbs out and clean everything and pop in a new set of plugs. I have a 87 Fz600 that was acting up until I cleaned the carbs.

Apr 20, 2009 | 1994 Yamaha FZR 600

1 Answer

91 yamaha fzr engine turns but wont start

the floats in the carb are stuck. you can try lightly tapping on the carb with a screwdriver that should do the trick.

Mar 10, 2009 | 1991 Yamaha FZR 600

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