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You know that jet your not supposed to touch...........

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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Although I have read a lot of posts on this forum this is the first one I have authored. Unfortunately it should do a fantastic job of making me look like a complete idiot.

I have a 1979 GS750L that hasn't run for about two years. It had ignition issues (crummy inconsistent spark) which I seem to have remedied with new used coils last week. I have a new issue now. I ordered a shop manual for the bike last week, and since I am an impatient moron decided to clean the carbs while I waited for it. I've cleaned the carbs before so no big deal right? Yeah right. I recieved my manual the other day, and toight I was finishing up my cleaning job when I read in the manual, the following note:

Caution: DO not unsrew or even turn the small jet that that is marked with colored paint. This jet is preset at the factory. The posistion of this jet is calibrated for each individual carburetor, and if disturbed, carburetor adjustment can be severely affected.

@#$%!!!!! I knew that chill that came over me as I put my scerwdriver in that slot wasn't a good thing. The chill did however prompt me to count the number of turns to remove the jet on one of the carbs though. Why only one? Yeah...........couldn't tell ya since I removed all four jets.

Anyway, any info on how to reset this jet would be much appreciated, and any belittling, and verbal assault will be accepted appropriately without honor or dignity.

Thanks, Adam
 
It's OK dont worry,they where set a bit to lean anyway to meet anti pollution reg's at the time.
One of the 750 guy's will chime in with a good starting point and you can work from there.
 
Everybody "screws" around with those things. Welcome to the club.
 
glad to hear that I haven't srewed up too bad

glad to hear that I haven't srewed up too bad

I still feel stupid for not reading before screwing. Now can anybody tell me where to start after reasssembly, and how to find the proper adjustment? Thanks Adam
 
I've heard it said that a common setting is in all the way to stop, then back it out 1 1/2 to 2 turns? again, this is all hearsay, but it's more than you've gotten so far :P

good luck, and look on the homepage here for the carb rebuild series, it may have some info as well, but I can't remember specifically
 
Use the one cylinder you counted how much the screw was out as a guide.
They can all be set differently, but you have a place to start that can make sense. Generally, on a stock bike, the screws can be anywhere from 1/2 to 1 1/4 turns. I'd probably try 1 turn out and test. Pilot circuit reads can be difficult to get accurately and seem to fluctuate some. Best you can do , besides obvious performance, is ride the bike in 4th gear about 35 mph on level or uphill ground and check the plugs after a couple of miles. Turning these out richens the mixture.
After initial setting, be sure to re-adjust the side air screws using the highest rpm method.
 
I removed one of those because when I was spraying Carb cleaner into the venturi port I saw it coming out around the screw on # 2 Carb.
I counted turns so we will see what happens when I get her running.
It has a spring under it and I was surprized how loose and easy it was to turn.
 
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