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What's the problem here?

  • Thread starter Thread starter thatdood
  • Start date Start date
T

thatdood

Guest
So,

Last week my bike was running kinda rough and kinda lean. Feelergaugephil gave me some advice and helped me find a good mixture for the bike, and now she's getting all the air and fuel that she should. But now I've run into another mystery.

When it ran lean I was able (albeit dangerously) to get the bike to rev all the way to redline in every gear. It wasn't too much difficulty to get up to 100mph or more. Now that the mixture seems correct (I've checked the plugs several times, always a mocca color) the bike won't rev past about 5500 in 3rd, 4th and 5th gears. It some times hesistates to do it in 2nd as well. It pulls great from idle to 5 grand in 1st, but when I try to take it up past that in 3rd, 4th, 5th, and sometimes 2nd it bogs and dives forward a little, slowing down until it catches up with itself. After it gets back under 5 grand, everything is ok again.

Everything on the bike is stock. I have 117.5 main jets in the carbs. One of my buddies seems to think either my spark plug coils are failing or I have a carberation problem. Tell me what you think.

thatdood
 
Using a restrictive fuel filter or float settings off? Kinked fuel line? Clogged petcock screen? Sounds like fuel delivery not ignition
 
fuel restriction, filter/screen plugged in the tank is one possibility as was said, also if there are screens in the inlet of each carb they maybe plugged also.
try prime or reserve position on the petcock and see if it changes.
 
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Something else to check is your vacuum line from the carbs to the petcock. If it's cracked or split, lack of suction could cause the petcock not to open fully which wouldn't matter at lower rpms but under high demand would restrict fuel flow...? Ya think? Sounds plausible to me :confused:
 
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jimcor said:
Something else to check is your vacuum line from the carbs to the petcock. If it's cracked or split, lack of suction could cause the petcock not to open fully which wouldn't matter at lower rpms but under high demand would restrict fuel flow...? Ya think? Sounds plausible to me :confused:
Click to expand...

In theory...I'd say sure. An easy test would be to run it on prime as Rustybronco suggested and see. Has to be a fuel restriction somewhere.
 
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