Simple fix for my bike's poor performance - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 08-23-2011, 08:58 PM Thread Starter
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Simple fix for my bike's poor performance

This summer I bought an 01 with just 4600 miles. The bad part was sitting around alot isn't good for carb's. It ran poorly and flooded the engine, so I had the carbs rebuilt. It ran much much better, but there was still a slight 'uneveness' about the way it ran. It was most noticeable at slower speeds around 3000 rpm. I was scratching my head and so was my mechanic. I thought it had to still be a carb issue. He suggested leaning the carbs a half turn, didn't cure it. I had given up getting it right.
THEN, one morning last week I had pulled it out and got off to close the garage, coming toward the bike I could see the left rear plug cap was leaking spark. The days are now getting shorter so it's still dark when I leave at 5:30that's the only reason I noticed the sparks flying inside the plug tube. There wasn't a visible crack in the cap, but after wrapping the plug cap with high voltage rubber tape there was no leak and the bike now runs like a scalded ape.
Sometimes it's just takes noticing something simple.
If you're having problems check your plug wires, I wish I had sooner.

Last edited by k9sarky; 08-25-2011 at 08:39 PM.
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post #2 of 4 (permalink) Old 08-23-2011, 09:01 PM
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Thanks for the tip, that's a great observation. I seldom check bikes in the dark!

2005 VN 750
MF Battery
Plexistar windshield
.040 pilot jets.
Splines lubed 1955 mi.
Iridium plugs
Reset pickup coil gaps.
Metzeler ME=880s
Shindengen MOSFET RR
V & H Cruzers
Speed bleeders
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post #3 of 4 (permalink) Old 08-30-2011, 04:46 PM
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I as well had this same exact problem with the left rear spark plug wire where it touches the rear upper cylinder head. What puzzled me with this problem is that I had replaced the wires altogether. It didn't cure the bike's poor performance until I wrapped that sucker with a thick layer of electrical tape. Then all is well.

go figure, mine is also a 2001 bought used, coincidence?

2001 VN750-Black/Silver
9900 Miles
Stock Everything
=Rotella-T 10W-40, SuperTech 6607=
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post #4 of 4 (permalink) Old 08-30-2011, 05:12 PM
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Originally Posted by ruk View Post
go figure, mine is also a 2001 bought used, coincidence?
Nope, it's actually the same bike.

And you are the same person as well, just a different personality... lol
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