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Rejetting a '77 gs400

  • Thread starter Thread starter charbot
  • Start date Start date
C

charbot

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I have a '77 gs400 and cant find a jet kit. It has stock carbs (BS34's)- PO put on a 2-1 exhaust and replaced the airbox with a single pod and pvc tee fitting(sprayed black of course) connected to the carbs. it has never been rejetted. Not sure where to start. Does the 1-2 pcv/pod airfilter function basically like the stock, or would I need "stage 3" (wouldnt mind mind ditching it and installing 2 pod filters, though)

any tips/ suggestions for rejetting my bike or links to where I can get the appropriate kit?

Thanks
 
for a starting point here are the stock specs:
main jet #112.5
pilot jet # 22.5
jet needle #4f23-3 (I havent been able to find this one on the replacement charts, is there a newer number?)
-ring on the middle clip


Thinking I should lower the ring one notch
main jet- around 120 if I have 2 pods, maybe 117.5 if I stay with the single?
open the air screw about 1 turn ....all just a guess.
 
Last edited:
Actually, having trouble finding any parts for this carb. Anyone know if any other mikuni models have the same jets or where to look? Z1 only seemto have stuff for vm
 
Try Sudco.

They have a PDF that has pictures and dimensions of all the Mikuni jets etc. so that should help you work out if you can get them or not...
 
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