Front cylinder lean - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 06-01-2016, 12:19 PM Thread Starter
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Front cylinder lean

Hello everyone - I just bought a 2002 vulcan 750 about 4 months ago and love it. I am new to this forum. I did notice the front cylinder is a little lean when inspecting the plugs as they are white in color. The rear looks fine. Color of the chrome tailpipe is a little yellow. My dad tells me that is from being too hot and lean. It runs pretty good, backfires on occaision when letting off throttle high rpm. Im told the front cylinder should run a bit leaner. I have worked on a lot of cars but bikes are a little new to me. Does anyone think the carbs need syncing or if I should be concerned to correct this? Visual inspection is ok. I see no vaccum leaks but have not smoke tested this. I did have one issue one day where the engine seemed starved and shut down, but I think it was vapor locked. I popped the gas tank lid and it started after about 5 min. Any suggestions appreciated. Thanks .
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post #2 of 6 (permalink) Old 06-01-2016, 01:16 PM
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This engine is set up lean from the factory, you'll see varying degrees of pipe discoloration on almost every stock set of headpipes.

The carbs are also real sensitive to dirt and stale gas. Dirty jets will make it even leaner. Bike sits around, carb gets half plugged, owner tries to ride it out.

Slides that don't lift all the way at full throttle will make it leaner (leaky diaphragms).

A lot of us swear by the correct dose of Seafoam 1-2 times/season, then a dose for winter storage. Other fuel stabilizers are also good for storage.

You might try Seafoam in the tank and see if the plugs read better after a tank or so. Or do a carb r&r to clean them.

Does it seem like it runs hot at all? Lean mix is hotter. Can check each headpipe with a temp gun near the heads. Exhaust mixes in the goat belly, so ex. gas temp doesn't count.

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post #3 of 6 (permalink) Old 06-01-2016, 05:20 PM Thread Starter
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OK- I am stopping for some sea foam tonight. It doesnt seem overly hot. Temp guage reading ok
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post #4 of 6 (permalink) Old 06-02-2016, 10:42 AM Thread Starter
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Seam foam is in. We will see if that changes anything. Thanks.
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post #5 of 6 (permalink) Old 06-02-2016, 01:57 PM
..have a vulcan good day!
 
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...was $6.74 @ Walmart......
just sayin' - -

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
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...have a vulcan good day!
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post #6 of 6 (permalink) Old 06-09-2016, 09:40 PM Thread Starter
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Ok ran the seafoam through. It made a difference. I still felt I needed to check the carb sync. Im glad I did, it was incorrect. I synced the carbs and boy what a difference. Thanks for everyone help
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