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80 gs 850 4-1 and k&N filter

  • Thread starter Thread starter yotaman423
  • Start date Start date
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yotaman423

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ok so i have setteled on the vance and hines 4-1 exhaust. apparently the only dyno jet kit i can get is a stage 3 which requires running pods. can i just up my main jets to .120's or.122.5's and a K&N factory style filter? will i need any piolt jets or air jets? will this setup even work? thanks guys:D by the way the bike is stock except for a mystery 4-2 exhaust thats pretty wore out.
 
Hi,

If all you are doing is adding the V&H 4-n-1 and you are keeping the stock airbox, you shouldn't need much in the way of jetting changes. I have read here where going up one size on the mains was all that is necessary, along with perhaps shimming the needles. You are going to have to keep an eye on your plugs to be absolutely certain. Use the "plug chop" method and read a plug at all throttle openings (idle, 1/4, 1/2, 3/4, and WOT).

I have notes HERE and HERE and HERE.

The is a copy of the V&H jetting recommendations on my website. It says to use a 120 main for the 850.

I thought there was a Stage 1 kit available?


Thank you for your indulgence,

BassCliff
 
If I'm not mistaken the only kit available can be used as stage 1-3.
It comes with three different sized jets.
 
ok thanks for the info guys. i know when i start changing things it could get messy just trying to get as much info. as possible before i start
 
If you are going with pods shoot me a pm, I got pods with my free 850 that I am not using. I got it from another GSR member so rather keep the parts in the family so to speak. Not sure how old they are but seem to be in good shape, I might even have the jets he used with the 4-1. No pipe but I have the pods and some baggies with carb parts he took out when he cleaned them to go back to stock.
 
BassCliff said:
Hi,

If all you are doing is adding the V&H 4-n-1 and you are keeping the stock airbox, you shouldn't need much in the way of jetting changes. I have read here where going up one size on the mains was all that is necessary, along with perhaps shimming the needles. You are going to have to keep an eye on your plugs to be absolutely certain.
Click to expand...


I'd go up two main jet sizes and see how it runs. Pods are a far more drastic change than adding a header.
 
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