Shocking driving and high irregular idles - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #11 of 47 (permalink) Old 07-02-2019, 11:40 AM Thread Starter
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Is there a easy way to upload videos to a forum post, might be Easyer to show you
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post #12 of 47 (permalink) Old 07-02-2019, 11:43 AM
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Is there a easy way to upload videos to a forum post, might be Easyer to show you
Upload to youtube, flickr, or maybe imgur, etc. Post link here.

Won't hurt to make sure the ignition coil connections are tight.

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post #13 of 47 (permalink) Old 07-02-2019, 11:57 AM Thread Starter
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Here it is

https://youtu.be/fcItzaRepEY

Note that so far its more likely it does this when heated. Even at idle speed. Which causes the bike to shut off if not keeping rpm above 3k

Last edited by Panarock; 07-02-2019 at 12:03 PM.
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post #14 of 47 (permalink) Old 07-02-2019, 12:05 PM Thread Starter
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I took it to mean a sudden burst of power, which points to dirty carb jets (but could easily be ignition), but the high rpm moments point to an air leak.

Should also check the vacuum line at the left carb, it should be dry at all times.
I noticed the vacuum line was sitting against the engine so it was melting. I think it's not melted all the way through though. I'll disassemble it to see. If not then that should not be the problem right
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post #15 of 47 (permalink) Old 07-02-2019, 12:05 PM
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Quote:
Originally Posted by Panarock View Post
Here it is

https://youtu.be/fcItzaRepEY

Note that so far its more likely it does this when heated. Even at idle speed. Which causes the bike to shut off if not keeping rpm above 3k
"Video Removed By User"

As posted earlier, sounds like two problems, by the description. Leaking boot after it heats up, clogged pilot jet.

Check the vacuum line from the left carb, should always be dry.

2003-21k mi
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__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #16 of 47 (permalink) Old 07-02-2019, 12:08 PM
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I noticed the vacuum line was sitting against the engine so it was melting. I think it's not melted all the way through though. I'll disassemble it to see. If not then that should not be the problem right
\

Is it wet or dry inside the hose?

If it's wet, and also leaking vacuum, there's the rev issue.

2003-21k mi
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__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #17 of 47 (permalink) Old 07-02-2019, 12:13 PM Thread Starter
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Quote:
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Quote:
Originally Posted by Panarock View Post
I noticed the vacuum line was sitting against the engine so it was melting. I think it's not melted all the way through though. I'll disassemble it to see. If not then that should not be the problem right
\

Is it wet or dry inside the hose?

If it's wet, and also leaking vacuum, there's the rev issue.
Is this considered wet?

And how would I fix this problrm if it is?
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post #18 of 47 (permalink) Old 07-02-2019, 12:16 PM
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Is this considered wet?

And how would I fix this problrm if it is?
I'd say yes, but only you can tell if that smells like gas and is wet. There should be no gasoline in that vacuum line, ever. If there is, a petcock rebuild is needed, and probably an oil change after it's repaired.

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post #19 of 47 (permalink) Old 07-02-2019, 12:31 PM Thread Starter
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Quote:
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Quote:
Originally Posted by Panarock View Post
Is this considered wet?

And how would I fix this problrm if it is?
I'd say yes, but only you can tell if that smells like gas and is wet. There should be no gasoline in that vacuum line, ever. If there is, a petcock rebuild is needed, and probably an oil change after it's repaired.
I would say that it doesn't smell like gasoline. Where would it come from? I've removed all the tubing and the only tube that has this is coming from the rear cylinder and only at the connection point.

Also looked at the petcock vacuum seal. And I would say it could use a replacement.
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post #20 of 47 (permalink) Old 07-02-2019, 12:34 PM Thread Starter
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Quote:
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Quote:
Originally Posted by Panarock View Post
Here it is

https://youtu.be/fcItzaRepEY

Note that so far its more likely it does this when heated. Even at idle speed. Which causes the bike to shut off if not keeping rpm above 3k
"Video Removed By User"

As posted earlier, sounds like two problems, by the description. Leaking boot after it heats up, clogged pilot jet.

Check the vacuum line from the left carb, should always be dry.


With vacuum line from the left carb do u mean the small tube in the Pic? No that's dry.

Sorry I tested the vacuum line coming from here (second Pic)
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