Exhaust changing colors - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 03-28-2014, 05:59 PM Thread Starter
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Exhaust changing colors

I noticed my chrome on the exhaust on the front head is starting to change colors. My bike seems to be running just fine. No backfires no issues. What can this be? And how would I fix it? Thanks for any info


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post #2 of 16 (permalink) Old 03-28-2014, 06:12 PM
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I think that means the bike is ruining to lean.

2007 Kawi ninja-sold
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post #3 of 16 (permalink) Old 03-28-2014, 06:35 PM
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Roger that. Is it turning yellow or starting to blue? Could be running lean. It's kind of a cool effect if you ask me, but you might need to check your air/fuel mix. If it is turning a reddish rusty color, you should move the bike indoors...that's oxidation and it ain't good.

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Leave it to me to NOT be fond of something then end up banging it.
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post #4 of 16 (permalink) Old 03-28-2014, 06:39 PM Thread Starter
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It's turning yellow


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post #5 of 16 (permalink) Old 03-28-2014, 07:05 PM
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Quote:
Originally Posted by kemen3 View Post
It's turning yellow


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All good advice....reliable sources.
I am curious what wssonta speaks on this subject......


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 03-28-2014 at 07:14 PM.
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post #6 of 16 (permalink) Old 03-28-2014, 07:34 PM
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Yeah, it would be too lean for me. How far does the discoloration go down the pipe? Exhaust modifications? Any carb work?
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post #7 of 16 (permalink) Old 03-28-2014, 08:24 PM Thread Starter
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It goes down about 3 inches the carbs were supposed to been redone before I bought it and no modifications to the exhaust


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post #8 of 16 (permalink) Old 03-28-2014, 08:43 PM
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It happens...but ya, signifies lean and overheating....in the 70s, I loved the rainbow colors though...most bikes get it...it dont make ya a bad person....
Wish I had pics of my Trumpet...was REALLY rainbowed....



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post #9 of 16 (permalink) Old 03-28-2014, 08:53 PM
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Quote:
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It goes down about 3 inches the carbs were supposed to been redone before I bought it and no modifications to the exhaust


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It does not sound like it is a bunch too lean. How does it run out?

I would suggest first to adjust the pilot air screws. On the front cylinder, count the turns in to the seat. Anything under 1 1/2 turns is too lean on a stock vn. Mine are 2 turns out and is a hair rich. If your front is 1 turn or less, you have found your problem.

If the pilot air screws are ok, I would check the float level on the front carb. It is easy to do. You could also look at the front plug. I no longer trust jetting to the plug, but you could probably see a serious problem.

Get back to us as I would be unhappy with it as is, especially with riding season upon us.
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post #10 of 16 (permalink) Old 03-28-2014, 09:31 PM
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Wmsonta ......U de' man !


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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