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Old 02-24-2013, 11:49 AM   #3349
Migration to offroad
Notaduke's Avatar
Joined: Dec 2006
Location: Vancouver BC
Oddometer: 36
Impact of lost spark arrestor screen

I just lost my first screen...should have read this thread earlier!

It certainly makes a difference in the sound, but I also noticed a simultaneous and considerable increase in backfire upon decel. Is that typical when you lose the screen?

Bike has 6 hrs on it, and backfired a small amount up until the change in exhaust note, which I am attributing to the lost screen, although I don't know if the screen departed at exactly the same time as the exhaust note changed. The backfire now also occurs slightly when closing throttle to shift up.

I can't get a replacement part for a week or so. Is it dangerous for the engine to run it with that much backfire? Is there another possible cause for sudden change in exhaust note and increase in backfire. This occured while accelerating hard up a hill, coming out of a turn.

Originally Posted by guns_equal_freedom View Post
The screen on the end of the pipe has nothing to do with the spark arresting capibilities of the pipe.

That screen is there to cut down on sound.

WRONG!! - The stock ktm mufler uses a Krizman type turbine spark arrestor.

WRONG!! - Look at the side of the muffler that's inside the rear wheel well.

Notaduke screwed with this post 02-24-2013 at 02:35 PM
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