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rich all 4.

  • Thread starter Thread starter i57chevy
  • Start date Start date
I

i57chevy

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I have a 1981 gs750l with the air screws on top near air filter. which way do I turn them for rich or lean? all four are running rich with smoke. I've been battling this bike with issues since I got it. I replaced the petcock. adjusted the valves. adjust tooth timing. rebuilt carbs. checked for leaks replaced exhaust gaskets. among other.
 
out makes it richer in makes it leaner. It may be a problem bigger than just turning a screw :-D. You may need to do some serious jetting.
 
I was wrong about location of screws. Been awhile since I messed with this prob. I'm pretty sure that they weren't all running rich before the carb rebuild. should I do another sync with them at 1.5 out. what comes first?
 
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I'm not sure of the exact #, but I believe that 1 and a half to 2 turns out from all the way in is normal for a stock air box and exhaust. Once you get this setting figured, you should use a manometer to synch the carbs.

Brad bt
 
fine tuning the air screws wouldn't throw the sync off after?
 
i57chevy said:
fine tuning the air screws wouldn't throw the sync off after?
Click to expand...

I don't know for sure, but after a carb rebuild it is necessary. If you've already synched them, it couldn't hurt to check after adjusting the air screws.

Brad bt
 
I was just syncing today adjusting the mixture screw wont change sync unless your really far off. If you just moving it < (less than) 1 turn you should be fine
 
Nicholaschase29 said:
I was just syncing today adjusting the mixture screw wont change sync unless your really far off. If you just moving it < (less than) 1 turn you should be fine
Click to expand...

That was kind of my thought, but with his situation it might be advisable. Besides, it's a fairly quick process IMO. VM carbs, on the other hand...;)

Brad bt
 
thanks for all the help. after I moved them to 1 and half. I ran it in the yard for a few cut it off at idle and checked one plug. It was obviously still sooty, but it looked like it was trying to tan up a bit. I quit cause it was getting dark.
 
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