Colder Plugs - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 07-23-2006, 12:13 PM Thread Starter
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Colder Plugs

I am thinking about running colder plugs in my 06 Vulcan to reduce the popping that I am getting from the Cruzer exhaust. I have done the marbling, and I have no exhaust leaks, and I have adjusted the pilot screws from min to max.
Which plug would you guys and girls reccomend. Plus, It wouldnt hurt to have the motor running a tad bit cooler. Back in the days of my Z1's I used to run cooler plugs with no ill effects. I currently have the stock plugs.
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post #2 of 11 (permalink) Old 07-23-2006, 01:01 PM
 
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I just finished the "De-goat" first had a bunch of popping problems, went back over the job, screwed the carb screws in, and back out 3 1/2 then made sure the plugs were over the air intake valves and the hoses also were plugged. That with premium fuel. None of which actions I can identify as the one that did it. It was a little cooler high 70's low 80's today, and a 40 mile ride, no inclination to pop whatsoever. AT LAST! That was nasty sounding.

2nd, part, am I happy with degoat, well it was cheap.... Will I spend any more money on exhaust for this bike, nope, not going to ever sound like a big cruiser, for that you need cubic inches. And that's what I'm saving for again. Meanwhile, this sounds a lot better.
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post #3 of 11 (permalink) Old 07-23-2006, 01:22 PM Thread Starter
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Gulf, Your statement "then made sure the plugs were over the air intake valves and the hoses also were plugged". Are you talking about the large hoses that are connected to the reed valve connections on the heads and then lead to under the gas tank?
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post #4 of 11 (permalink) Old 07-23-2006, 01:58 PM
 
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Yes, The de-goat kit had rubber plugs that covered the metal reed valve hose inlets, and since I pulled the hoses and also plugged them also. I can't see what that had to do with anything, but something I did caused the net improvement to be 1000%

FWIW, I ran the adjustment screws all the way in and back out past 3 1/2 turns.
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post #5 of 11 (permalink) Old 07-23-2006, 08:19 PM Thread Starter
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Ok. I am getting the popping in the front cylinder only, I am going to pull the pipe off again and remount it with the Harley exhaust gaskets this time. Those gaskets I think are made of some sort of material other than metal, they will most likely seal better than the crap Kawi gaskets. Other than that, I cant figure out why only the front cylinder is popping. Anything related to the front cylinder has been checked for tightness. Ill pick up those gaskets on monday.
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post #6 of 11 (permalink) Old 07-23-2006, 08:34 PM
 
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Funny thing this is, I was getting most of my popping in the rear cyl. Thought it was related to the shorter exhaust run. Good luck on the gaskets.

I didn't loosen the header pipes up, although instructions said to. I knew I'd bust those studs off If I had half the chance of doing that. Good I went on and pulled the premuffler anyhow- the rear cyl side (left) was nothing but rust. I had to cut my heat shield bolts off and replace them.
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post #7 of 11 (permalink) Old 04-16-2007, 07:55 AM
 
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I removed the big muffler myself, retaining it for possible resale. I modified some exhaust pipes to fill in the gap, enough to replace the extension pipe. Your right, it sounds much better. Once I return from the sand box I will eliminate the backfiring with your suggested "Marbling", and do the Air/fuel mixture adjustment and the r/r relocation. Hooah!! Thanks for the help. MSG U.S. Army, Iraq
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post #8 of 11 (permalink) Old 04-16-2007, 02:03 PM
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Quote:
Originally Posted by Kenmonter View Post
Once I return from the sand box I will eliminate the backfiring with your suggested "Marbling", and do the Air/fuel mixture adjustment and the r/r relocation. Hooah!! Thanks for the help. MSG U.S. Army, Iraq

Here's to the safe return of all our soldiers, and getting your Vulcan quieted down


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post #9 of 11 (permalink) Old 04-16-2007, 03:39 PM
 
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Thanks for your service Kenmonter! Good luck with your Vulcan. Keep her smile side up.
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post #10 of 11 (permalink) Old 04-16-2007, 05:17 PM
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i may be wrong, but wouldnt you want hotter plugs for a better burn???

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