Mixture leaning out? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 06-18-2009, 03:24 PM Thread Starter
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Mixture leaning out?

Hey, my name is Chris. My dad has a 1986 vn750, and I have a 1981 kz305. My question is about the kz305. I just bought it one week ago, and it will run with the choke on half, but if you turn the choke all the way off, it will start "hunting" then smooth out for a minute, and then rev up to 3,500rpm and then back down to 1,500rpm. we cleaned out the gas tank, and removed all the water, then replaced it with some fresh gas and some stabilizer. We also added a good amount of seafoam. Should we just run the sea foam and clean everything out? or do we need to remove the carbs and do a FULL cleaning.
Also, when you accelerate, and roll on the throttle, it wont go over 3,000 rpm and the same for all 6 gears. Its as if you only have 1/4 throttle. could this be due to a gunked up carb? the bike sat for a few years and i only imagine that some gass gummed up in there. maybe running seafoam will do it. thanks, any help is very appreciated.

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post #2 of 6 (permalink) Old 06-18-2009, 03:54 PM
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Have you checked the air filters? What about the plugs?
Running just the Seafoam wont be a problem, and would be a good idea. Some other fuel stabilizers are known to do a nasty job on internal plastic parts. Not Seafoam.

If it's been sitting awhile, you just may need to do a thorough cleaning of the carbs.


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post #3 of 6 (permalink) Old 06-18-2009, 05:26 PM Thread Starter
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Have you checked the air filters? What about the plugs?
Running just the Seafoam wont be a problem, and would be a good idea. Some other fuel stabilizers are known to do a nasty job on internal plastic parts. Not Seafoam.

If it's been sitting awhile, you just may need to do a thorough cleaning of the carbs.
the kz305 only has one air filter. And it looks pretty good. The plugs are wet and oily. I need to clean and gap the points. Maybe it has a cold spark.
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post #4 of 6 (permalink) Old 06-21-2009, 03:25 PM Thread Starter
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Any thoughts?

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #5 of 6 (permalink) Old 06-21-2009, 08:01 PM
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Quote:
Originally Posted by 1986vn750 View Post
the kz305 only has one air filter. And it looks pretty good. The plugs are wet and oily. I need to clean and gap the points. Maybe it has a cold spark.
I think you pointed out the first steps to take in this post. Clean, dry and gap the plug. Clean and gap the points, then try it again. If it is still wet and oily, check the plug for the right heat range. Maybe try a new one, one step hotter.

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post #6 of 6 (permalink) Old 06-22-2009, 10:01 AM
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Sounds to me like the carb needs a thorough cleaning, especially if you found water in the tank. That means you have all kinds of crud in the carb. Water will turn gas to varnish and corrode the internals of the carb.

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