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#2 carb not pulling a whole lot of vacuum

  • Thread starter Thread starter liloaty
  • Start date Start date
L

liloaty

Guest
I just got in from synching my carbs and 1, 3 and 4 are pulling a great vacuum at idle but #2 just cant get up there - it's like 8-10 inches under the other cylinders. No vacuum leaks and the bike idles great so I'm not really sure where to go next. Any ideas?
 
Sounds exactly like the vacuum line to the petcock isn't plugged.
 
did you try turning the screw so the butterfly valve closes all the way?
 
vacuum go up at all? whens the last time you adjusted your valves?
 
catbed said:
vacuum go up at all? whens the last time you adjusted your valves?
Click to expand...

I personally have never done it, the PO said it was done about 5000 miles ago, and to be honest I'm not exactly sure how to or I would...
 
i can do it in 30-45 minutes but ive done it before so id say first time would take 1-1/2 to 2 hours. pretty easy once you do it though.
 
Is your bike an 8-valve or 16-valve? If it's an 8-valve engine, send me an e-mail, I will reply with my spreadsheet that helps you keep track of your adjustments and shim sizes.

.
 
Steve said:
Is your bike an 8-valve or 16-valve? If it's an 8-valve engine, send me an e-mail, I will reply with my spreadsheet that helps you keep track of your adjustments and shim sizes.

.
Click to expand...

It's a 16 valve, so no shims but twice the hassle haha.
 
only thing i can think of that would lower vacuum would be intake valves messed, and that may be from a warped rocker arm maybe?
 
catbed said:
only thing i can think of that would lower vacuum would be intake valves messed, and that may be from a warped rocker arm maybe?
Click to expand...

I ordered a valve cover gasket and new pilots (they are too small - I'm out like 3.5 turns) so I am going to adjust valves Wednesday and report back!

Thanks for the suggestions!
 
Also check the vaccum dia on the slide assembly make sure it is correctly seated in the carb
 
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