Coaster Mod -- Purpose? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
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  • 3 Post By Goofyfoot2001
  • 1 Post By Knifemaker
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post #1 of 6 (permalink) Old 04-24-2018, 10:54 AM Thread Starter
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Question Coaster Mod -- Purpose?

I saw that the Ear Shave procedure includes replacing the exhaust reed valves with blank plates and/or blocking off the vacuum supply to these reed valves.

As I understand it, these reed valves push fresh air into the exhaust during deceleration. It's part of the emissions system, to burn off any unburned gas remaining in the exhaust.

It seems people remove this system for two purposes:
1. To eliminate backfire/popping
2. To lower exhaust pipe temperature to reduce/eliminate bluing.

I happen to like the backfire/popping sound, and my stock pipes probably turned blue before I started 1st grade. So, is there any other reason/advantage to removing this system?

Thanks!


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post #2 of 6 (permalink) Old 04-24-2018, 01:17 PM
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post #3 of 6 (permalink) Old 04-24-2018, 01:50 PM
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Quote:
Originally Posted by Jason Pittenger View Post
I saw that the Ear Shave procedure includes replacing the exhaust reed valves with blank plates and/or blocking off the vacuum supply to these reed valves.

As I understand it, these reed valves push fresh air into the exhaust during deceleration. It's part of the emissions system, to burn off any unburned gas remaining in the exhaust.

It seems people remove this system for two purposes:
1. To eliminate backfire/popping
2. To lower exhaust pipe temperature to reduce/eliminate bluing.

I happen to like the backfire/popping sound, and my stock pipes probably turned blue before I started 1st grade. So, is there any other reason/advantage to removing this system?

Thanks!
No.
I too liked the popping sound (reminded me of my Austin Healy) My stock pipes never turned blue. My take is if it doesn't make the bike faster, why bother?
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post #4 of 6 (permalink) Old 04-24-2018, 05:24 PM
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It cleans up a lot of clutter around the engine. Makes service and cleaning a lot simpler. Losing the airbox (earshave) is the biggest improvement in that dept.
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post #5 of 6 (permalink) Old 04-24-2018, 06:11 PM
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Plugged

I took off my goats belly when I put my new Harley mufflers on. I removed the hoses from the reed valves and just put on big vacuum plugs with hose clamps instead of getting plates. Doesn't look the best, but my bike still pops on deceleration, maybe even more, and I like it doing that too.
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post #6 of 6 (permalink) Old 04-24-2018, 09:50 PM
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Quote:
Originally Posted by Vulcanlover View Post
I took off my goats belly when I put my new Harley mufflers on. I removed the hoses from the reed valves and just put on big vacuum plugs with hose clamps instead of getting plates. Doesn't look the best, but my bike still pops on deceleration, maybe even more, and I like it doing that too.
Try playing with the air mixture screws

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