Stealth Exhaust
#42
11-24-2007 | 03:25 AM
Senior Member
1st Gear Member
Joined: Mar 2007
Posts: 684
From: Sellersville,PA.
RE: Stealth Exhaust
The Krizman style (OEM) looks like a stationary turbine. It routs the exhaust through the turbine then it hits the very end plate of the muffler--alll around the outlet hole. It then flows back around & out the opening. This motion of the exhaust causes all carbon particles to drop out of the exhaust air.
Don't believe me:
1. There is a cleanout plug at the end of the muffler. This cleanout is where all the particles drop out in the Krizman arrestor. You remove the plug, start bike, & it blows the arrestor out clean.
2. Look in a stock exhaust, I bet you see the turbine structure. I could see it on my 300EX, XR650L, & KLX 300 muffler. I never bothered looking in my 250S muffler--it wasn't on long.
3. The method the USFS uses to check for a spark arrestor is to stick a wire in the exhaust outlet & it MUST hit the spark arrestor within a certain distance. They use 1/8" wire to check for krizman types, for screens they use a 0.024" wire (meaning the screen must be fine enough to not let a 0.024" wire pass through---that is very small & why they can easily clog--especially on two strokes).You stick your drill in--the first thingyou drill through is the sparky. Now you do not pass inspection & are ticketed for modification to no sparky.
Don't believe me:
1. There is a cleanout plug at the end of the muffler. This cleanout is where all the particles drop out in the Krizman arrestor. You remove the plug, start bike, & it blows the arrestor out clean.
2. Look in a stock exhaust, I bet you see the turbine structure. I could see it on my 300EX, XR650L, & KLX 300 muffler. I never bothered looking in my 250S muffler--it wasn't on long.
3. The method the USFS uses to check for a spark arrestor is to stick a wire in the exhaust outlet & it MUST hit the spark arrestor within a certain distance. They use 1/8" wire to check for krizman types, for screens they use a 0.024" wire (meaning the screen must be fine enough to not let a 0.024" wire pass through---that is very small & why they can easily clog--especially on two strokes).You stick your drill in--the first thingyou drill through is the sparky. Now you do not pass inspection & are ticketed for modification to no sparky.
also i use an FMF powercore IV with a quietcore insert and a screen and it is very quiet around the idle-4000 rpm range but after that you get quite a bark from it but all my neighbors tell me it is pretty quiet.They say even without the quiet core it was still much more tolerable than the hardley-ablesons that blast up the huge hill behind our houses.the tone is what dose it IMO.
#43
11-24-2007 | 03:21 PM
Senior Member
1st Gear Member
Joined: May 2007
Posts: 878
From: New Glasgow, Nova Scotia, Canada
RE: Stealth Exhaust
thx for posting. I guess I'll bump the afternarket exhaust further up on my list to accomplish before next spring, at least before inspection and heading to the woods. In fact i looked for some screen to use when I was modifying the exhaust, but didn't find anything I felt would stand up to the heat. Looks like I'l be asking Santa for a new muffler.
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