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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!
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!

'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
26980.4+ miles
Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Shindengen MOSFET FH020AA r/r
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion
Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
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Just a middle finger to the state of California and every lib on the planet.
2014 Kawasaki KLR 650
Back to the Kawa World
Quote:
Originally Posted by Jason Pittenger
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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!
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!
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?
If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
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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.
2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf
Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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.
1985 VN700A
FYI :
Kawasaki introduced the 750 cc class Vulcan worldwide in 1985. Due to tariff restrictions in the United States on bikes over 700 cc imported from Japan, the initial US spec model was limited to 699 cc. The tariff was lifted in 1986 and the Vulcan went to 749cc.
Quote:
Originally Posted by Vulcanlover
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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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