| Author |
Message |
    
Revz
| | Posted on Wednesday, August 13, 2014 - 03:10 pm: | 
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97 S3 runs okay until I try to get the last little roll on out of the throttle. It will sputter until I roll it down a bit. If I roll the throttle real slow no problems.
I have taken the carb apart, cleaned the jets, checked the fuel hose, and have also taken the fuel vent off at speed, and cracked open fuel cap at speed all to no avail.
It sounds like in a hard roll on it's getting too much or too little fuel. Float valve? Any ideas?
Thanks
REVz |
Gabby_duck
| | Posted on Wednesday, August 13, 2014 - 04:01 pm: |
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I don't know the carb on your bike but from what your saying it is starving for fuel.If it has a accelerator pump maybe the plunger is bad.From what your saying the bowl is running out of fuel or not keeping up with demand thats where the accelerator pump is to give that extra fuel during hard acceleration. |
Revz
| | Posted on Saturday, August 16, 2014 - 02:57 pm: |
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Thanks gabby duck
Carb is cv40 Keihin
Taken carb apart, replaced accelerator gasket and spring.
replaced slide spring.
cleaned carb
still sputtering on hard roll on
????
Where next? |
Gabby_duck
| | Posted on Sunday, August 24, 2014 - 05:06 am: |
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From your info you need adjust the carb.per your service manual adjust the air fuel mixture.turn clockwise cw to lean or counter clockwise ccw to richen the air fuel mixture.don't mess with idle adjustment from your info you got that correct.make your cw ccw turns 1/8 to 1/16 then test run until you smooth out the stumble/hesitation. |
Revz
| | Posted on Saturday, August 30, 2014 - 05:22 pm: |
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went to 185 main jet, with the upgraded (smooth tapered) needle,new accelerator pump springs, and replaced all intake gaskets. pulls like a freight train. Thanks gabby duck |
Gabby_duck
| | Posted on Sunday, August 31, 2014 - 10:11 pm: |
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hows your fuel mileage with the 185 main jet |
Revz
| | Posted on Monday, September 01, 2014 - 07:10 pm: |
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Took it out today for first long ride. It is still coughing a bit around 50-60 mph. Haven't checked mileage yet. A bit more tuning to do. |
Gabby_duck
| | Posted on Monday, September 01, 2014 - 09:07 pm: |
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Some good info https://www.youtube.com/watch?v=sDMjl5O66BM |
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97 S3 Sputters during roll on