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pilots and mains

  • Thread starter Thread starter rusted
  • Start date Start date
R

rusted

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Hi all,I was reading in another forum about having the pilot screws 7/8 turn out. I assume that is out from the bottom. What is the amount for the main jets, or is there any. And why the rubber stoppers over the pilot jets? What if they were removed? I have an 80 850G. The bike is power lacking, the compression and valves are good. The carbs have been gone through three times in the last month. but the jets are, 115 and 190 I think. Petcock is aftermarket and new.Thanks,Rusty
 
rusted said:
... the pilot screws 7/8 turn out. I assume that is out from the bottom.
Click to expand...
Yes, bottom the screws lightly, then back them out, but 7/8 turn is for the older, VM carbs. Your bike has the BS carbs, and should be 2-3 turns out. Start with 2 to get the bike running, then tweak them using the highest RPM method.

rusted said:
What is the amount for the main jets, or is there any.
Click to expand...
The main jets and all other jets besides the idle mixture screws mentioned above, should be snug. No need for gorrilla-grip torques here, just use enough so they don't vibrate loose. No Loc-Tite, either.

rusted said:
And why the rubber stoppers over the pilot jets? What if they were removed?
Click to expand...
The rubber stoppers are there to direct fuel through the proper jets. The fuel that goes through the pilot jets has already gone through the main jets. If the rubber stoppers are removed, the pilots are free to suck from the bowl, as well, so won't necessarily get the right amount of fuel. Also, the needle jet (the one wil all the small holes just above the main jet) will now be able to draw fuel through the main jet and from the unstopped passage where the pilot jet lives. The unregulated flow will play havoc with your mixtures. Leave the rubber plugs in. If they are loose, get new ones, they are cheap.

rusted said:
the jets are, 115 and 190
Click to expand...
The 115 is a stock main jet, not sure what your 190 is. The stock pilot jet appears to be a 40.

If you still have your mixture screws only 7/8 turn out, that could be the biggest part of your apparent power loss. Are you running stock airbox and pipes? If so, the stock jetting should do fine. If you are not, you will need to do some re-jetting to get things right.


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if hes running stock 115 mains and 190s thats a big differance. could he be flooding the two that have 190s in them? it should have the same size jets in all 4 carbs right?
 
Yeah, I agree with you. the carbs should have same size jets.
 
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