Vacuum line on 81 xs 650 - Yamaha Forums
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post #1 of 4 Old 07-07-2020, 06:09 AM Thread Starter
 
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Vacuum line on 81 xs 650

not sure where to hook up the vacuum line coming from the petcock...have both air boxes coming...carbs were off the bike when I got it...gas line must connect to middle of 34 mm carbs
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post #2 of 4 Old 07-07-2020, 07:14 PM
 
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Originally Posted by Retired restorator View Post
not sure where to hook up the vacuum line coming from the petcock...have both air boxes coming...carbs were off the bike when I got it...gas line must connect to middle of 34 mm carbs
That line sounds like a kind of safety thing, opens the petcock with vacuum I'm thinking. If that's the case it will need to go between the throttle plate(slide) and the head. (manifold vacuum)
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post #3 of 4 Old 07-08-2020, 01:54 PM Thread Starter
 
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Ok tks....the carbs have one line coming out between them..not sure how to post photos
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post #4 of 4 Old 07-08-2020, 11:07 PM
 
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Originally Posted by Retired restorator View Post
Ok tks....the carbs have one line coming out between them..not sure how to post photos
To be clear, the petcock has 2 lines right? The fuel line and another vacuum line?
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