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What is my correct main jet size?

  • Thread starter Thread starter D.Harrison
  • Start date Start date
D

D.Harrison

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I am the proud owner of a 1982 GS750 TZ,basketcase. I have put the bike back to original specs as far as parts availability will allow. I have bought a set of jets (16 total),with different sizes to choose from. This is my problem, which set do I use? They are as followed;102.5,110,120,140. Are any of these the correct jet? The engine is stock,and is using the original airbox. Any help is appreciated.
 
Last edited:
D.Harrison said:
I am the proud owner of a 1982 GS750 TZ,basketcase. I have put the bike back to original specs as far as parts availability will allow. I have bought a set of jets (16 total),with different sizes to choose from. This is my problem, which set do I use? They are as followed;102.5,110,120,140. Are any of these the correct jet? The engine is stock,and is using the original airbox. Any help is appreciated.
Click to expand...

I can narrow it down for you. Stock jetting on my 79 8 valve 750E with VM carbs was 102.5. Your bike is 16 valve and CV carbs and slightly more hp.
140 jets on a stock 750, I can assure you will be much to large. My 85 1150E with opened air intakes still only requires 122.5 jetting. So most likely successful will be the 110 jets. I would expect 120 to run a bit too rich. 102.5 will not be enough and 140 is in the forget it range. :-)

Earl
 
Stock jets for 1982 750T

Pilot jets 42.5
Main jets 112.5
Pilot air jets 170
 
D.Harrison said:
I am the proud owner of a 1982 GS750 TZ,basketcase. I have put the bike back to original specs as far as parts availability will allow. I have bought a set of jets (16 total),with different sizes to choose from. This is my problem, which set do I use? They are as followed;102.5,110,120,140. Are any of these the correct jet? The engine is stock,and is using the original airbox. Any help is appreciated.
Click to expand...

My GS750B (1977) used 102.5 as standard, but the later 750's used a larger jet, 112.5
 
You must remember we are talking two different types of carbs That could account for the differences in jetting
 
SqDancerLynn1 said:
You must remember we are talking two different types of carbs That could account for the differences in jetting
Click to expand...

Agreed, I was just pointin out the obvious size differences and a 112.5 in either an early or late model is still a 112.5
 
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