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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Drilling stock muffler baffles /cgi-bin/YaBB.pl?num=1120505782 Message started by milesb on 06/29/05 at 17:18:16 |
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Title: Drilling stock muffler baffles Post by milesb on 06/29/05 at 17:18:16 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. |
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Title: Re: Drilling stock muffler baffles Post by bobo383 on 06/29/05 at 19:00:02 I didn't just drill the baffle, I cut the whole rear baffle out. Sound was loud, but high-pitched like a dirt bike not low-rumbly like a cruiser. Also, my low end power suffered pretty bad but wide open was about the same as before. I still have that stock pipe with no rear baffle, if you want it you can have it for the shipping cost to get it to you - figure about 25 pounds from 76015. I was most pleased with the Screamin'Eagle and stock Sportster mufflers. |
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Title: Re: Drilling stock muffler baffles Post by milesb on 06/30/05 at 17:55:35 Thanks for the offer. I'll sit on my stock muffler for a while - just curious about simple mods for down the road. Miles |
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Title: Re: Drilling stock muffler baffles Post by shawn_b on 06/30/05 at 21:17:08 i did it sounds a little louder.i adj the fuel mix screw it back fires less. shawn |
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Title: Re: Drilling stock muffler baffles Post by milesb on 07/01/05 at 04:07:30 how did you do it, that is, what diameter holes and how many? did you just simply drill into/thru the baffle? how thick is the baffle? thanks, Miles |
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Title: Re: Drilling stock muffler baffles Post by bobo383 on 07/01/05 at 04:30:32 The back baffle is about 1/4 inch (6mm) thick. It's tough. |
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Title: Re: Drilling stock muffler baffles Post by shawn_b on 07/01/05 at 11:56:44 2 holes 1\4 inch one on top one on the below :P hard to drill like bobo said :-[ shawn |
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Title: Re: Drilling stock muffler baffles Post by milesb on 07/02/05 at 11:39:30 Did it, Drilled two 1/4" holes on opposite sides of the baffle. Used a $5.49 Ace Hardware Cobalt bit on my 3/8" corded B&D drill. Piece of cake getting through the the baffle. If you do it, just be careful as you begin to punch through the metal so as not to hang up the bit. The Cobalt bits have a self tapping tip that makes it easy to know when you've started to punched through. Definitely adds a little "attitude" to the sound. A bit louder, maybe a slight bit lower tone. For ten minutes worth of effort, not a bad result. Miles p.s. last post on this topic I'll put here. this should be in RSD as I've read, but since I started it here, figured it best to end it here. |
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Title: Re: Drilling stock muffler baffles Post by Greg_650 on 07/02/05 at 13:35:42 milesb wrote:
And would you believe that I didn't realize who started this topic? Oh well, open mouth and jump right in....tact isn't one of my strong points :) |
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Title: Re: Drilling stock muffler baffles Post by milesb on 07/06/05 at 20:02:17 Update: 1/4" holes seemed to add a little more volume so I bored 'em out to 3/8". Nice result. A little bit louder, a more raspy pop on decceration. I'll stop there. Miles |
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Title: Re: Drilling stock muffler baffles Post by lancer on 07/06/05 at 21:03:36 Harley sportster mufflers are inexpensive and already have one big hole in the back already...no drilling required!! |
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Title: Re: Drilling stock muffler baffles Post by milesb on 07/06/05 at 21:07:21 ;D mfb |
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Title: Re: Drilling stock muffler baffles Post by za16866 on 07/07/05 at 12:36:39 I drilled out my girlfriends with a 1/4 bit.... i think i put 6 in it... throaty.. gotta love it... it also backfires .. pop pop BOOM!!! sounds like a 12 guage going off.. i love it.. i let her lead most of the time.. every time it does it in town... people jump out of their shorts... I just follow behind her and giggle... |
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Title: Re: Drilling stock muffler baffles Post by milesb on 07/07/05 at 13:09:40 Six, eh? Hmmm, now you got me thinking.... Just took short ride to check out the front brake after I cleaned the rotor with brake cleaner, pulled & sanded the pads, lightly greased the pins and shot the backs with anti-squeal compound. No more squeal! Thanks guys/gals for the great instructions in another thread on doing that simple job. Anyway, when I got back, I pulled the bike in front of the garage door, left it running and went in to open the door. As someone suggested, the bike definitely sounds like a UH-1 chopper while idling! fwiw, after the drilling, I don't have a significant increase in backfire. Just an occasional one on decel. Miles |
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Title: Re: Drilling stock muffler baffles Post by rkutzner on 07/12/05 at 17:10:06 Pics or links to pics please !!! Getting tired of the golf cart comments....hehehe... |
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Title: Re: Drilling stock muffler baffles Post by sluggo on 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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Title: Re: Drilling stock muffler baffles Post by milesb on 07/12/05 at 19:50:58 rkutzner wrote:
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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Title: Re: Drilling stock muffler baffles Post by HollyHavoc on 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 ;D |
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Title: Re: Drilling stock muffler baffles Post by savage777 on 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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Title: Re: Drilling stock muffler baffles Post by Greg_650 on 07/15/05 at 07:47:25 milesb wrote:
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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