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gs850 rejetting

  • Thread starter Thread starter gixer
  • Start date Start date
G

gixer

Guest
I just picked up a 1985 gs850 but it doesn't have an air cleaner on it. I want to run after market "cone" type air filters on it. Does anyone know what number jets I should use ? The bike will run right now but will not rev up. It's running way too lean.
 
It is currently running too lean because there is no airbox. To save yourself the jetting hassles and other problems associated with pod filters, find a stock airbox and install it.

Now, to answer your question, the new jet size would depend on the ability of the new filters to flow extra air. If they are relatively restrictive, you might not need new jets. If they flow rather freely, you might need to go from the stock 115 up to maybe a 120 or 122.5. If you have a 4-into-1 header, you will need to go even farther. Only experimentation and reading the plugs will tell for sure.

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Pods will require re-jetting all jetting circuits. If your stock mains are 115, you'll probably need approx' 130's or ? just for pods. You'll also need to richen the jet needles, etc. Tests will tell.
I think pods need a good pipe or you should just go with stock.
 
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