Lean Pop on Deceleration - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 03-30-2016, 12:07 PM Thread Starter
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Lean Pop on Deceleration

I have always had a pretty bad lean pop on deceleration. The owner before me put an exhaust on it and I suspect that they never rejetted it. Before I take apart my bike, would it being too lean cause it to pop that bad under deceleration?

If so, what is the stock jet size, what jet size should I bump it up to, and what type of jet does this carb use? Does it have the size stamped on the jet to see if they did swap it out?

Thanks y'all
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post #2 of 14 (permalink) Old 03-30-2016, 12:30 PM
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Before you rejet you may just need to adjust the mixture screws. They're sometimes covered with little chrome plastic caps on the carbs.

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post #3 of 14 (permalink) Old 03-30-2016, 11:21 PM
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What exhaust system is on the bike and is the bike coastered how bad is the pop

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post #4 of 14 (permalink) Old 04-01-2016, 10:13 AM Thread Starter
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What exhaust system is on the bike and is the bike coastered how bad is the pop
A vance and hines. I don't know the exact model because it was on before I bought the bike.

I'm sorry I don't know what coastering is.

The pop is pretty dang bad. like 60% of a gunshot.
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post #5 of 14 (permalink) Old 04-01-2016, 10:20 AM
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Read through this https://www.vn750.com/forum/showthread.php?t=1081
And this explains coastering https://www.vn750.com/forum/showthread.php?t=1085

There is a lot of information in the Vulcan verses

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post #6 of 14 (permalink) Old 04-01-2016, 10:21 AM
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Explanation of coasters:
Coaster Installation

$20 a set from one of our own:
https://www.vn750.com/forum/17-sell-s...-coasters.html

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post #7 of 14 (permalink) Old 04-01-2016, 10:22 AM
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Quote:
Originally Posted by calebj View Post
Explanation of coasters:
Coaster Installation

$20 a set from one of our own:
https://www.vn750.com/forum/17-sell-s...-coasters.html
GET OUT OF MY BRAIN
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lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

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post #8 of 14 (permalink) Old 04-01-2016, 11:05 AM Thread Starter
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Quote:
Originally Posted by calebj View Post
Explanation of coasters:
Coaster Installation

$20 a set from one of our own:
https://www.vn750.com/forum/17-sell-s...-coasters.html
This is an interesting idea. I'll have to give it a try. Have y'all personally had a noticeable difference in sound/power/etc from this installation?

I'll also give seafoam a try in the meantime. I've seafoamed a few cars without noticing much difference. Has this ever done anything for y'all?
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post #9 of 14 (permalink) Old 04-01-2016, 11:13 AM
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Quote:
Originally Posted by snowman4839 View Post
This is an interesting idea. I'll have to give it a try. Have y'all personally had a noticeable difference in sound/power/etc from this installation?

I'll also give seafoam a try in the meantime. I've seafoamed a few cars without noticing much difference. Has this ever done anything for y'all?
You won't see any change in sound, but it may or may not help the popping. My bike still popped after the coasters, I think the coast enrichers on the carbs were sticking. After some rides the popping stopped, bike had been stored quite a while before I bought it.

Seafoam can help, every time my carbs seem to be acting up, one tank with Seafoam clears it up, usually twice per season and for storage. Have never had my carbs off.

If you have open pipes, it's probably going to need bigger jets, that's usually standard procedure when switching pipes.

Coasters do eliminate a lot of clutter on the engine.

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post #10 of 14 (permalink) Old 04-01-2016, 11:47 AM
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Quote:
The pop is pretty dang bad. like 60% of a gunshot.
A vacuum leak can also cause this.

If I unplug the capped vac port on the right side carb (have coasters), she goes off like a cannon on long decels.

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