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  1. #1

    '97 GTX.....idles fine, 1/2 throttle fine, full throttle......boggg

    Low hour 1997 GTX 3 seater (800 carb, 150 comp).

    Starts great, idles perfect but when I hold it wide open it bogs out until I let off the gas a little then it goes again. It has last years fuel in it.....

    Any ideas?


  2. #2
    Derek45's Avatar
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    Grey fuel lines???? if so theres your issue, replace and go through Carbs to clean them also be sure your Fuel reserve switch fuctions right and is not cloged up as well.

  3. #3
    Yes, gray lines.

    Darn, I have had many with gray lines and never was bitten by "the gray line bug". Looks like my time has come.

    Is it a tough job?

  4. #4
    Myself's Avatar
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    Do a full tune up.
    Replace all grey fuel lines
    Clean out or replace fuel switch
    Clean oem fuel filter screen
    Clean out carbs thoroughly
    Replace spark plugs
    Grease pto
    Change jet pump oil

    Easily done in an afternoon by a beginner.

  5. +1 by:


  6. #5
    While replacing the lines I usually add a clear in line filter. Just change them out one at a time from tank and fuel selector as not to get them mixed up.

  7. #6
    Quote Originally Posted by Myself View Post
    Do a full tune up.
    Replace all grey fuel lines
    Clean out or replace fuel switch
    Clean oem fuel filter screen
    Clean out carbs thoroughly
    Replace spark plugs
    Grease pto
    Change jet pump oil

    Easily done in an afternoon by a beginner.
    I am a beginner, and I would want some kind of instructions to clean carbs or change jet pump oil. Do most use a service manual?

  8. #7
    Myself's Avatar
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    There's a how to vid on Youtube for changing the jet pump oil. No need for the super high dollar pump oil, just good 90w marine gear lube is fine. I use synthetic. I don't know of any how-to's for the carbs but the main thing is inspect internal rubber parts for rot or damage, clean internal micro screen filters, clean out fuel line fittings as they are usually 1/2 full of green goo.

  9. #8
    Make sure you use genuine mikuni oem carb kits. Usually there is a print off of instructions included. I think sbt has a instruction pdf. On their site for carb cleaning/rebuild

  10. #9
    blairwill4's Avatar
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    There is a how to on this forum that I beleive is very well written on how to clean your carbs without changing all the bellows and such. It tells you how to check and see if yours are okay. And the grey line bug easily becomes a gret line blown up motor if you don't fix them asap.

  11. #10

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    it took me about 2 hours to tackle the job this past weekend. I had the hose and clamps already. do one hose at a time.

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