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Muffler Mod (Read 8 times)

r80rt

Ex Member

Muffler Mod
09/17/05 at 16:01:00

I couldn't get past the cobbled looks of the Sportster muffler so I worked on the stock one. From the INLET end you can see a perforated plate and about an inch under it is a baffle plate. I used a 12 inch long 1/4 inch drill bit and drilled a dozen holes through both plates. NO mods to the outlet end. It sounds much deeper than stock now and is a little louder, very close to the sound of the Sportster muffler and it all fits and looks like it should. Grin

Only a fool would attempt it, and God help me, I am that fool.

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cards385 Ex Member	Re: Muffler Mod Reply #1 - 09/18/05 at 04:34:47 Did it effect the performance or the mpg. Sounds like a good idea.
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r80rt Ex Member	Re: Muffler Mod Reply #2 - 09/18/05 at 06:43:07 I don't think it changed the performance at all, I doubt it will help or hurt the mpg. But to me the much better sound is worth the effort.
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cards385 Ex Member	Re: Muffler Mod Reply #3 - 09/18/05 at 19:26:52 Did you have to re-jet the carb after drilling the holes?
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r80rt Ex Member	Re: Muffler Mod Reply #4 - 09/19/05 at 03:45:26 I put a bigger 152.5 main jet and went two turns out on the air jet when I bought the bike, they are just too lean from the factory. I don't think you would need to re jet since drilling the baffle plate dosen't really change the flow.
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Jim_R

Ex Member

Re: Muffler Mod
Reply #5 - 09/19/05 at 09:19:05

I got a sportster muffler too. I got a 157.5 main and 55 pilot. I liked the sound of it but after awhile I thought what the hay Ill tear out the baffle. I didnt realize how much of a chore it was. So I got a hammer and a flat screwdriver and punched hole after hole and got the rear part out. WHOOPS I forgot it was a beveled shape and it couldnt go out that way and it definitely wasnt going out the front. Puzzled I asked Torque for some help. He had a metal pipe and we inserted it in the muffler. After rammin the pipe onthe ground with the muffler on top it finally popped out. We defied physics and my god its throaty now. I can tell a difference in acceleration and def the sound.. I actually passed a neighbor and set off his truck alarm hahaa.

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SavageDude Serious Thumper Alliance Member Offline Posts: 561 OC_California Gender:	Re: Muffler Mod Reply #6 - 09/19/05 at 19:54:11 r80rt wrote on 12/31/69 at 16:00:09: Yep, that should have been 152.5 on the main jet. Hey r80rt; Just 1 stupid question ??? Where did you get your 152.5 main jet from?
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r80rt Ex Member	Re: Muffler Mod Reply #7 - 09/20/05 at 03:38:17 I got the jet from a Dennis Kirk catalog, I have an extra one if you want it.
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Savage_Rob Serious Thumper Alliance Member Offline Mechanically Inclined Amateur Posts: 6972 Texas (Dallas area) Gender:	Re: Muffler Mod Reply #8 - 09/20/05 at 05:40:53 SavageDude wrote on 12/31/69 at 16:00:09: Where did you get your 152.5 main jet from? I got mine at a local HD dealer for $3 each, though they only had a couple of sizes.
Back to top	1998\|MAC muffler\|ceramic coated header\|K&N air filter\|Amal Mk2 carb\|Odyssey battery\|iridium plug\|NC windshield\|Dunlop 491s\|Superbrace\|EBC brake rotor\|12.5" Progressive shocks\|Kuryakyn ISO grips IP Logged

SavageDude Serious Thumper Alliance Member Offline Posts: 561 OC_California Gender:	Re: Muffler Mod Reply #9 - 09/20/05 at 09:42:43 r80rt wrote on 12/31/69 at 16:00:09: I got the jet from a Dennis Kirk catalog, I have an extra one if you want it. Thanks for the offer But I think I will go to the HD dealer(Savage_Rob's advice ) 1 block away from my house and check to see if they have any.
Back to top	2005 S40, debadged, Tkat FB, saddle bags, sissy bar, HD Sporter muff, Fly screen, white spacer mod, 150 main jet.....and sssslowly upgrading IP Logged

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