breaking up on hard accelleration - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 09-22-2006, 05:22 AM Thread Starter
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breaking up on hard accelleration

hope someone can help me with this new problem. last week i coastered the bike and put on a set of V/H cruisers. i set the air mixture screws to 2-1/2 turns. under normal light acceleration everything is cool but if i wind it out it strats breaking up & slight bucking is noted. seems like i' not getting gas quick enough to the cylinders. so should i rejet or just how far can i turn those screws out to get a richer mixture to the cylinders or is it something entirely different? thanks in advance to your replies.

i already cut the vent tube that goes in the right ear 45 degrees.

thanks, john
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post #2 of 9 (permalink) Old 09-22-2006, 06:12 AM
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Ive turned my fuel/air screw out 3 turns, i put a dab of silicone there so the screw wouldnt move. Adjusting the screw wont make a difference with your problem. After 1/4 throttle, your running on different jets. I dont have that problem. I am also running cruzers with no break up at all.
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post #3 of 9 (permalink) Old 09-22-2006, 06:36 AM
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Have ya checked or changed the sparkplugs ?
Also, have ya cleaned the airfilters lately?


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


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Aim for the apex."

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post #4 of 9 (permalink) Old 09-22-2006, 07:37 AM
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Run the bike at night to see if there is any arcing around the plugs.

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post #5 of 9 (permalink) Old 09-22-2006, 08:33 AM
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When you coastered it did you plug the vacuum line on the right hand side?
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post #6 of 9 (permalink) Old 09-22-2006, 04:30 PM Thread Starter
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wwmWood,
when i coastered i removed the polution system the (reed values, and the tubing from the reed valves to the valve behind the tank as well as that valve ) the two tubings from that valve i plugged and that was it. there is a tube that goes into the right ear, shoul i've of plugged that tube too. is that the vacuum line you're talking about Wood?

thanks john
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post #7 of 9 (permalink) Old 09-22-2006, 06:55 PM
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No, don't plug that tube. That is not part of the EPA junk. It goes to the carbs. You did the right thing by cutting it off at 45 deg.

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post #8 of 9 (permalink) Old 09-22-2006, 07:11 PM Thread Starter
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then the 2 tubes that went into the valve behind the tank, should those 2 be plugged or just the larger one?
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post #9 of 9 (permalink) Old 09-22-2006, 07:23 PM
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The vacuum line Wood is referring to comes off the right side of the bike from the carb and runs to the valve in back of the tank. This is a small hose.
Since you removed the rest of the EPA system, you need to plug that line or the carbs will suck air when they are not supposed to. That line causes the exhaust recirc valve to close under accelleration and open during decel feeding the supposedly unburned air/fuel mixture into the exhaust.

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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