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Any advice for running on a broken pilot fuel screws

  • Thread starter Thread starter G-3
  • Start date Start date
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G-3

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So I'm rebuilding my carbs on my 78 GS 750, I have two broken pilot fuel screws. Cannot get new ones for two weeks can I run my bike on the broken ones any thoughts?
 
How are they "broken". If the tips are broken then I wouldn't even try to run it until you're replaced them and verify that the tips are not plugging anything.
 
Yes the tips are broken off, I got one out and trying to get the another one out .
Damn, I can't imagine being bike less for the next two weeks!
The bike was running pretty good in that condition, but are you worried that I have the potential of running way lien or way Rich?
 
The metal in the carburetor bodies where the Pilot Fuel screws seat is thin so the two that were broken off have already damaged the seats. It's going to be a guessing game to get them adjusted with new screws to emulate a properly adjusted screw with a good seat. The seats are stretched out larger so the screws will need to be turned in more than the ones that have not been damaged. When you get your new set of Pilot Fuel screws, screw them in until they seat (very carefully). Make sure everything is absolutely clean because it can be hard to tell when they lightly seat if there is any resistance from anything in the threads. Lightly seated the tips of good needles and seats will be just below the tiny hole in the throat of the carburetor. You will have at least two that stick up above into the throat. Use that to judge how you will have to compensate. Screw them back out so they are even with the good seated screws noting how much you needed to turn them out to be even with the others. Use that as a general starting guide when you adjust but they will probably need to be in just a bit more. I'm running a stage three jet kit so my settings are in further than most. I believe chuck hahn has a pretty good handle as to where to start your settings on a stock bike.
 
If you can remove the broken tip, sharpen what's left and run it. The screws will not be all the same number of turns out, but you can get it close enough to run OK.
If you can't get the old tip out, you're pretty much fooked.
 
Thanks for the advice, I found a new set from a Canadian dealer that should be here in three days!
 
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