stock muffler with 4 holes drilled require carb changes?

Thumperville · 07-15-2012, 08:12 PM

hi all, i was wanting to know if drilling 4 holes in the end of the stock muffler require any changes to the carb or can cause any negative long term affects?

i did drill 4 holes in muffler, i did not make any changes to the carburetor...yet.

i have rode with the holes now for maybe 4 tanks of gas.

i like the sound now. it is not like cutting the muffler off completely loud, just more thumpy and deep. seems to run as peppy as normal, idles same, no dip in performance.

*btw i'm running with the 16t sprocket.

blaine · 07-15-2012, 09:11 PM

Pull the plug & check for a white tip (indicates running lean).It should be a tan color.You should be fine as is.

:cool:

**jonathan180iq** · 07-19-2012, 08:58 AM

I have a video of what this sounds like on youtube and you can clearly hear the lagging revs and the crap exhaust note that comes from doing this.
You can get by without it, but I would adjust jetting slightly, as the lagging revs clearly indicate that the bike is running lean after doing this.

I can't post a direct link, as I am at work and Youtube is blocked.
Just do a search for "Marauder Gz 250 exhaust comparison"

07-15-2012, 08:12 PM	#1
Thumperville Junior Member Join Date: Jun 2012 Location: mid west Posts: 15	stock muffler with 4 holes drilled require carb changes? hi all, i was wanting to know if drilling 4 holes in the end of the stock muffler require any changes to the carb or can cause any negative long term affects? i did drill 4 holes in muffler, i did not make any changes to the carburetor...yet. i have rode with the holes now for maybe 4 tanks of gas. i like the sound now. it is not like cutting the muffler off completely loud, just more thumpy and deep. seems to run as peppy as normal, idles same, no dip in performance. *btw i'm running with the 16t sprocket. Login or Register to Remove Ads
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07-15-2012, 09:11 PM	#2
blaine Senior Member Join Date: Feb 2010 Location: P.E.I. Canada Posts: 3,784	Re: stock muffler with 4 holes drilled require carb changes? Pull the plug & check for a white tip (indicates running lean).It should be a tan color.You should be fine as is. :cool: __________________ If at first you do succeed, try not to look surprised.
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07-19-2012, 08:58 AM	#3
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,995	Re: stock muffler with 4 holes drilled require carb changes? I have a video of what this sounds like on youtube and you can clearly hear the lagging revs and the crap exhaust note that comes from doing this. You can get by without it, but I would adjust jetting slightly, as the lagging revs clearly indicate that the bike is running lean after doing this. I can't post a direct link, as I am at work and Youtube is blocked. Just do a search for "Marauder Gz 250 exhaust comparison" Login or Register to Remove Ads
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