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I think I may have found a problem - Vacuum leak question

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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So I think my bike is running too lean after installing Pods and dynojet kit.

I think I may have realized why...Will I have a vacuum leak if I run the bike with the tops off the carbs (they aren't the CV diaphragm type)?

I was just looking over a duplicate set of carbs and noticed a groove in the side of the slide which I'm guessing isn't a tight enough seal around the centering pin to prevent a leak.

What do you think - am I on to something?
 
Haven't messed with jet kits much. ON the slide carbs Their is a small 1/2" long piece of hose between the carbs 1&2 3&4 connects the vents together. they should be left open when using pods/jet kit. Having the top off shouldn't make any difference
 
On slide carbs you have to have the tops open while you're synchronizing them, so...

Just don't drop any rocks in there or anything.

Oh wait, I just re-read your question...

NO! Don't ride around with them open! You do NOT want anything getting in there, like dust, birds, rocks, water, etc.
 
leak

leak

you will run a small amount of unmetered air around the slides with the tops off, due too cleance between the carb slides and bodies dont do it, as well as picking up dirt, if you want to prove it take a small piece of news paper and at about 2500rpm set the piece of paper on the top of the carb and the vacuum leak will pull it down against the body
 
There will not be any significant vacuum loss by running the bike with the carb tops off. They're off as you synch the carbs, with no ill effects. If you have a vacuum leak, it's not related to the tops.
 
Have you read my last reply to your original topic in this section?
I listed the necessary steps to re-jetting. I also covered any possible causes of intake/vacuum leaks.
 
bwringer said:
NO! Don't ride around with them open! You do NOT want anything getting in there, like dust, birds, rocks, water, etc.
Click to expand...

Ha! Good one - birds don't like carbs, do they?

Keith - I didn't see your post until you mentioned it - hopefully I'll get a chance to play with the bike this weekend and see what I come up with. I'll keep you updated. Thanks again for your help.

Later,
Jay
 
KnuckleBuster said:
Keith - I didn't see your post until you mentioned it - hopefully I'll get a chance to play with the bike this weekend and see what I come up with. I'll keep you updated. Thanks again for your help.

Later,
Jay
Click to expand...
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