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Keihin CR Carbs

  • Thread starter Thread starter gaillarry
  • Start date Start date
G

gaillarry

Guest
Brought back to life, an 83 GS850GL which had been neglected too long. Bike has a brand new set of Keihin CR carbs with velocity stacks. Carbs were setup by Sudco to work on this bike.

Bike starts and runs great but carbon fouling plugs 1&2. Did a valve adjustment, still fouling the plugs. Great spark on all the plugs.

I'm thinking velocity stacks is making it run too rich and I should switch to pod filters or should I adust the air screw on the 1 & 2 ?

GS850L004.jpg
 
provided all four carbs are set equally id check the engine compression
changing to pods shouldnt make much difference as they let aprox as much air as velocity stacks
if the carbs were originally set to run with the stock airbox than you should have a lean condition not rich
adjusting the airscrew should correct the problem of fouled plugs at idle / low throttle (if thats where your problem is) - you can do a plug chop at 1/8 throttle to confirm
 
Carbs are set to run without the airbox, just the velocity stacks. I'll do a compression check.
 
no carbs can come completely pre-set from the manufacturer but always need tuning when on the engine
provided the carb jetting is right, its only the pilot mixture that has to be adjusted

do you know what exhaust setup are the carbs jetted for and what exhaust do you run?
 
Air jet 240
Needle YY8
Clip Position 4
Slow Jet 65
Valve Seat 3.2
Starter Jet 50
Air Screw Setting 1 turn out

I'm running stock pipes.
 
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