No More Decel Popping - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 10-11-2006, 01:52 PM Thread Starter
 
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No More Decel Popping

Did a carb re-jet this weekend to try and and stop the annoying decel popping that I have had since installing my V&H Cruzers. Up one size on both the main jets and pilot jets. I did the mains first and tested the effect. The slight engine shudder that I had when rolling the throttle full on in top gear was now gone. Back to the garage to do the pilot jets. With the new pilot jets in and pilot screws set to 2 turns out I set out to do some testing. Roll on and off the throttle several times, only one small pop as soon as I roll off the throttle. 1/2 turn more ccw on each pilot screw and no more popping. I was so happy with the results that I rode for about 70 miles rolling on and off the gas listenining to the sound of the Cruzers. Stopped at a store to refuel. My bike has always had the hot start problem. MF battery, pick-up coil gap adjust had no effect. Every time I would stop for gas it always took 3 to 4 tries to get it to start. It would fire once but not start. But this time she roared to life on the first try. I had to try this again, so I rode for a couple miles down the road to the next store, stopped and got a cold drink. She started right up again. Although further test is required it appears I may have solved my hot start problem as well.
For anyone interested in trying this the jets are not that hard to change, and carb removal is not necessary. Keihin CV jets are available from http://www.motorcyclecarbs.com
#135 main jets p/n 99101-393 #135 $5.95 each.
#40 pilot jets p/n N424-22 #40 $6.95 each.
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post #2 of 8 (permalink) Old 10-11-2006, 10:40 PM
Benjammin'
 
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Hot starts....

Wingman,
I also had the dreaded hot start issues until I switched the plugs out to iridiums. Starts are amazing- hot or cold now on my all stock machine. If you haven't made the switch, I bet you see even more difference with those plugs on your newly jetted rocket.

Ben-
SW Ohio

'02 VN750
Pipes drilled
Spline lubed
R/R relocated
AGM batteried
Iridium equipped
LED tail lighted
8000-ish miled
Soon to be MCCTed

Lovin Life.
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post #3 of 8 (permalink) Old 10-12-2006, 12:13 AM
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What part # iridiums did you us BSkaggs513? Also where did you purchase them from? Thanks!
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post #4 of 8 (permalink) Old 10-12-2006, 05:59 PM
Benjammin'
 
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Popping.....

Sparkplugs.com
http://www.sparkplugs.com/results_cross.asp?pid=7803

4 - NGK IX iridium
Stock Number: 7803
Part Number: DPR7EIX-9
Unit Price: $6.95

I was able to search the internet and get a coupon code for 10% off through the site. Google search Sparkplugs.com coupon code and see what you come up with.

Ben-
SW Ohio

'02 VN750
Pipes drilled
Spline lubed
R/R relocated
AGM batteried
Iridium equipped
LED tail lighted
8000-ish miled
Soon to be MCCTed

Lovin Life.
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post #5 of 8 (permalink) Old 10-12-2006, 06:59 PM
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Woh, those are expensive plugs !

Ron from Jersey
2005 VN750
HellFire windshield
Kaw extended backrest
Cobra exhaust
Re-located stator wires
Side bags
15,000 Miles July/2012
It's PAID OFF ! May 2009
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post #6 of 8 (permalink) Old 10-13-2006, 01:32 AM
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Not as expensive as the iridium-paladium plugs, but that's another story.

2000 A16
Drilled baffles
$65 leather saddle bags
Kuryaken grips
relocated R/R
de-badged
25,000+ original owner miles
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post #7 of 8 (permalink) Old 10-13-2006, 12:52 PM
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You forgot about the tritium enrichment.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
VROC #8542
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post #8 of 8 (permalink) Old 10-13-2006, 06:51 PM
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Popping...

They are expensive, but the only ones you will ever buy for your bike. If you get them....remember- put anti-seize on the threads!!!

Given the difference they made in my bike, I considered it money well spent. Mostly because it eliminated the embarrasment when the bike major backfired on hot starts.

Not sure if the statement I heard is altogether accurate, but someone said because the plugs require less voltage to produce the same arc, it puts less strain on the electrical system. (The manufacturer claims less current for the same fire.) Given the state of our bike's electrical system, I would buy that.

Either way, I have sang the praises of the plugs from the minute I installed them.

Ben-
SW Ohio

'02 VN750
Pipes drilled
Spline lubed
R/R relocated
AGM batteried
Iridium equipped
LED tail lighted
8000-ish miled
Soon to be MCCTed

Lovin Life.
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