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Drilling stock muffler baffles (Read 25 times)

sluggo Serious Thumper ModSquad Offline big singles lead, twins follow the pack Posts: 4744 moses lake washington Gender:	Re: Drilling stock muffler baffles Reply #15 - 07/12/05 at 17:13:45 another option is the "hartman mod". type that into a google search and you will find excact directions on how to do it.
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milesb

Ex Member

Re: Drilling stock muffler baffles
Reply #16 - 07/12/05 at 19:50:58

rkutzner wrote on 12/31/69 at 16:00:07:

Pics or links to pics please !!!

Getting tired of the golf cart comments....hehehe...

Don't have the digital camera handy, but it's pretty simple: There are four rivets and four welds on the end baffle surrounding the exhaust port. I used a 1/4" cobalt bit (form Ace hardware) on my 3/8" corded drill. Two holes, just dodge the rivets and welds.

It was easy going through the end plate, just be careful as you penetrate so you don't hang up the bit. Ten minutes, tops.

Miles

p.s. mine's an '02, not sure if the same stock exhaust is on the '05.

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HollyHavoc Ex Member	Re: Drilling stock muffler baffles Reply #17 - 07/14/05 at 20:40:41 Drilled 4 holes 1/2"ers. (I did 3 myself :'( !) Richened the idle up a little & run super (good thing the tank isn't that big!) Sounds better and runs smoother-no pop on decel. I can't help myself...I must have more
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savage777 Ex Member	Re: Drilling stock muffler baffles Reply #18 - 07/14/05 at 20:58:49 I did the drill out mod....4 - 1/2 " holes with a 12" drill bit . It caused my 2001 to run a little leaner than it did before but it definately made it louder. I just ordered a Jardine muffler so we'll see how it sounds.
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Savage_Greg

Serious Thumper
Alliance Member

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Don't go around your
ass to reach your
elbow...

Posts: 7844
SW Washington State
Gender: male

Re: Drilling stock muffler baffles
Reply #19 - 07/15/05 at 07:47:25

milesb wrote on 12/31/69 at 16:00:06:

A post appeared in the rubber side area about a new owner with backfire questions. It appears as though the the previous owner drilled the muffler baffles.

Has anyone done this to add a little throat/noise? Any inherent problems with this and does it require carb rejetting? Any ideas on procedure or is it as simple as drilling holes in the end baffle?

Seems like an easy way to get some added sound but it also seems too simple to be without some type of downside.

I recently purchased a completely stock '02 (except for the carb spacer reduction). Thanks for any info.

Downside? Yep, you lose the option of returning the bike to its stock condition, plus you'll lose back pressure and the correct air/fuel mixture.

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