Question about 1988 Yamaha XJ 600

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My 1993 FZR 600 doesnt want to go into the 9,000 rpm range.

I have a 1993 FZR600 I pulled the carbs off and cleaned the jets. WHen I was finished the bike was running great,and was real fast. But the past few days when I take it out the rpm dont wanna reave above 9,000 and the engine sputters.. But it runs fine until it hits that rpm range.. So what would be your guess. The bike was sitting up for a year and probably needs more plugs but could that be the cause of it..

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  • billf6905 Jan 26, 2009

    Yes I put a new fuel filter on the bike and No i did not drain the fuel tank.. But the other day I pulled the fuel filter off but the flow is normal. The bike was sitting up for over a year. Do the carbs need recalibration? I dont know what else it could be I might pull the carbs back off and clean the tank to see if that fixes the problem any other suggestions..

    Thanks

  • billf6905 Jan 26, 2009

    Ok but yes I had all the the jets and the small ports all cleaned out very good so my guess would be somehow something made it through the filter and the carb.and has something clogging it.. I have noticed also that my fuel pump seems to strain when I first turn the key on. When in the past if pumped smooth I took off the hose connecting from the fuel pump to the carb. and the pump works fine but with the hose in place it strains so Ill pull the carbs off once again.. Thanks alot you have been most helpfull..O and one other thing I was thinking of installing a stage 3 jet kit. WOuld that be A good choice the bike is all stock with a Yoshimura exhaust..

  • billf6905 Jan 26, 2009

    Thanks alot man I really appreciate the help..

  • Larry Randall May 11, 2010

    If it ran fine right after the carb work then it is most likely the sync is close enough(they should be synced though but a bad sync wont cause your prob). Most likely water or dirt has made its way back to the carb or possibly the filter clogged but you say it is ok.



    I would pull the carbs again, open them up in a tray so you can see if dirt or water come out.



    Do you have a manual? There is alot more going on than just jets, there are small ports that affect the choke circuit greatly and other circuits as well.

  • Larry Randall May 11, 2010

    Have you cleaned/replaced fuel filter?

    How long was the bike sitting before you cleaned carb?

    Did you drain the fuel tank when you did the carbs?

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A stage three would help,,,,,, but it can be a can of worms that really takes a GOD(that was a typo I meant good, but it fits) mech to setup. That aside they usually work fine as per the default instructions. Use the moderate settings, if you go for the high performance modded engine it wont run very good and will get **** mileage and it will have less horsepower.

Posted on Jan 26, 2009

  • Larry Randall Jan 26, 2009

    sorry, about the fuel pump, it shoud strain after the fuel stops flowing into the carbs due to the backpressure. It sounds strained and slows a bit.

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