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General Category >> Rubber Side Down! >> Harley muffler with old back fire
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Message started by pgambr on 06/16/15 at 18:56:03

Title: Harley muffler with old back fire
Post by pgambr on 06/16/15 at 18:56:03

Gents:

The s40 is running well; although, something new is occurring. I put on a dyna muff about 2 years ago and as opposed to the back fire I would get a deep gargle. For about a month now it is gradually getting louder & louder I am getting the old back fire again. It doesn't really bother me, just curious why? Perhaps a loose ground wire? Thanks.

Best regards,

Title: Re: Harley muffler with old back fire
Post by old_rider on 06/16/15 at 19:30:14

Internals are trying to get out.....burned up inside, mine is doing it also. Ever look at your bike from the back while its running down the road? you know....while riding a friends bike? The exhaust hole looks like another tail light, bright red!

Title: Re: Harley muffler with old back fire
Post by Serowbot on 06/16/15 at 22:23:24

Could be rotting muffler guts as OR says,... could be loosened header bolts, or muffy clamp...
Check for snug... but don't strip...

22k miles... my Sporty shorty shot it's baffle plate out like a bullet...
Luckily,... I bought a pair... ;D...

Title: Re: Harley muffler with old back fire
Post by pgambr on 06/17/15 at 06:40:46

Thanks guys, it must be all that tremendous power that single piston puts out. ::)

Best regards,

Title: Re: Harley muffler with old back fire
Post by Kris01 on 06/17/15 at 19:01:15

Considering how this thing vibrates, check your air screw on the carb. It may have vibrated loose.

Title: Re: Harley muffler with old back fire
Post by Boogieman on 06/18/15 at 12:00:23

Hollow it out and get a cone filter. it'll be near impossible to "tune" but she'll be obnoxiously loud and awesome