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Magic formula for jet sizes?

  • Thread starter Thread starter planetcaravan03
  • Start date Start date
P

planetcaravan03

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So....I am bringing back this old GS1100gl back from the dead. I was wondering if there was some magic formula for determining jet sizes in relation to each other(main to pilot to pilot air)? I had looked around Bikecliff's site and couple others and couldn't find what I was looking for.
Basically I have a 83 GS1100gl it is all stock ignition, exhaust and air box(with factory filter). I have #115 mains #160 pilot airs and #45 pilots.
I don't see where any of the jet sizes I have match with any one of 1983 model years listed on Bikecliff's site. Any input would be helpful.
Thanks
Paul G.
 
Keep in mind that the shafties were tuned a bit differently than the other 1100s, mainly because of the 2-valve vs 4-valve heads.

My chart says the '82 and '83 1100 shafties should have 115 mains, 40 pilot fuel, 170 pilot air.

Your 45 pilots are two sizes larger, which might enhance cold engine behavior a bit, but possibly at the expense of some fuel mileage. Your 160 pilot air jets are also making it run a bit richer, with the same possible results.

.
 
Stock bike = stock jetting.

The jetting info is contained in the factory Suzuki service manual.
 
Well, I ended up finding some #180 pilot-air jets. Since my bike will see around 500-800+ miles per week commuting to and from work the extra fuel mileage will be an asset. Of course an 1100 might not be the most fuel efficient choice but, that is what I have.
 
Nice that you found some 180s, but be aware that leaner is not always better for fuel mileage. :-k

These bikes were already a bit lean from the factory, so going even leaner might be going the wrong direction.

.
 
I'll leave the #160's in it and see how it runs. But the carbs are spotless clean, floats are set, o-rings, bench sync'ed(waiting for the vacuum synchronizers to show up this week) are new everything in there is in great shape. I replaced the factory fuel pet-cock after losing about half a gallon down the cylinder's and my floor. Oil has been changed....now if I could just do something about this weather.
 
Best bet is to put in new plugs and ride it a while and pull the plugs to see what they look like. Plugs chops are good for initial setup too. But once i get one of my bike to where I think it should be, I put in new plugs and actually ride it as I would regularly and under real use conditions and then take a peek. Color and/or sootiness is gonna tell you a lot.
 
I'll give it a shot this weekend depending on the weather. Thanks everyone.
 
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