What does this cap on carb do? - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 4 (permalink) Old 11-16-2016, 09:19 AM Thread Starter
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Question What does this cap on carb do?

#87 in the attached diagram. It's Yamaha Part Number: 5GK-1491A-00-00 and it's labeled "cap". Is this a vacuum cap for carb? Thanks for your help.




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post #2 of 4 (permalink) Old 11-16-2016, 02:34 PM
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That looks like the the cover for yer vacuum, for balancing yer carbs. Needs to be there or will draw air in and bike will run like sh t.

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post #3 of 4 (permalink) Old 11-17-2016, 10:18 AM Thread Starter
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Quote:
Originally Posted by sonysnek View Post
That looks like the the cover for yer vacuum, for balancing yer carbs. Needs to be there or will draw air in and bike will run like sh t.
Yeah that's what I thought too! In fact, when I was carb sync'ing, that's where I connected the hose. I learned it's not that one. The vacuum port is just a little bit further up on the VStar 1100 and points straight out.

I went to the dealer and they told me it's another vacuum port. Not sure why there's 2 so close together.

Hopes this may help someone in the future.

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post #4 of 4 (permalink) Old 11-25-2016, 08:23 AM Thread Starter
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This is what the cap looked like before I replaced it.

Funny thing, I replaced cap and adjusted idle speed a little and now it's popping more than before. Actually, it wasn't popping at all until I messed with it.


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