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Persistent vacuum leaks and cold #1&4

  • Thread starter Thread starter ejether
  • Start date Start date
So, I'm still pretty stumped here.

Quick recap:
Bike came in running lean on all cylinders with hesitation and surging.

I have replaced:
Carb boots and o-rings
Airbox boots
All o-rings on the fuel tees, a/f screws (cycle o rings kit)
Butterfly shaft seals

And there are still major vacuum leaks between carbs 2&3

I'm testing with starting fluid sprayed through a red straw directly onto different parts of the carbs and have ruled out intake boots as the cause.
It only revs up whenI spray fluid between 2&3 on the butterfly shaft and this is supported by how hot cylinders 2&3 are running.

I'm really at my wits end here and I can only think of a cracked carb body at this point?
 
Last edited:
EJ

Can you post up some pictures of the problem area? Do one with the straw in it for reference

I hate it when carbs kick my ass
 
Possibly worn throttle shaft bushings in the carbs. I think i have the same issue with my kz. I wanna see what you find before i rip into my kz's carbs again
 
Hey ejether, did you doa vacuum sync on those carbs? I just redid the sync on my kz and my lean issues went away.
 
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