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General Category >> Rubber Side Down! >> Dyna muffler, re-jet and Raptor
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Message started by Eric on 10/28/12 at 15:50:02

Title: Dyna muffler, re-jet and Raptor
Post by Eric on 10/28/12 at 15:50:02

Just finished dyna muffler ($35 on feeBay) re-jet and petcock replacement on my wife's 2006. Starts instantly, runs great, like a completely different motorcycle and no more big back-firing. We had adjusted the idle mixture screw previously and still had Big Bang backfires. Also, we were having the 55mph power fade from the petcock and that is gone now as well. No problem getting to 80mph.

It appears to us that the header pipe started to yellow after a 100 mile ride. Replies yesterday stated this wasn't a problem.

Title: Re: Dyna muffler and rejet, header yellowing
Post by bobert on 10/28/12 at 17:13:17

Differing colors depend on the temperature. First comes yellow, then brown, then blue.

A little yellowing won't hurt anything. I have a dyna muffler and a rejet. The header is just a tinge of yellow for about the 1st 3 inches.

Title: Re: Dyna muffler and rejet, header yellowing
Post by Serowbot on 10/28/12 at 17:17:25

Yup,.. what he said... ;)...

Title: Re: Dyna muffler and rejet, header yellowing
Post by Gyrobob on 10/28/12 at 19:09:57

465D575F5B020404340 wrote:

Just finished dyna muffler ($35 on feeBay) and rejet on my wife's 2006. Runs great, like a completely different motorcycle and no more big back-firing.

It appears to us that the header pipe started to yellow after a 100 mile ride this morning. What's causing this? I thought lean mixture - hot running would turn the pipe blue, not yellow.

Any ideas.

Lean mixtures cause cooler combustion temps, not hotter.