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Message started by 03svrider on 10/11/08 at 18:31:50

Title: exhaust pipe blueing
Post by 03svrider on 10/11/08 at 18:31:50

I put a jc whitney baffled exhaust pipe on my Dad's 05 s40. With just installing the pipe, removing the air fuel mixture plug, and adjusting the mixture as per the instructions found here the new pipe blued alot at the point on the pipe where the baffle starts inside and to where the new pipe connected to the old header.
Is that a bad sign?
I didn't do anything else to the carb either. I have a jet kit I can use but the bike ran fine without doing anything after installing the pipe. Revved fine with no hesitation all the way through from zero to full rev. My Dad says it seems smoother when he test rode it and performance definately hasn't decreased.
I also can't seem to get a good seal no matter how hard I tried moving the adapter around that came with the new pipe. There is a leak in that area that causes some popping but my Dad likes it. Everything else was great. Real easy install.

Title: Re: exhaust pipe blueing
Post by EssForty on 10/11/08 at 20:24:56

Blueing is a sign of heat, but the fact that it is happening on what should be the cooler part of the pipe and not the OEM header pipe makes me think two things could be in play

1) Same heat as before , cheap pipe. Lightweight chrome plating, and/or poor insulation inside the new pipe would make it discolor when the stock slip on would not.
2) Excessive heat, good pipe. Air inleakage at the slip-on joint is generating some extra heat. A richer idle mix could result in some unburnt fuel passing thru the cylinder and when it combines with some more air it pops in the pipe.

If the power is really smooth from idle to full throttle there's no reason to rejet IMHO. I'd try to figure out how to get the pipes to mate better to eliminate air inleakage first. I've heard of people slipping pieces of a torn aluminum soda can stock around the joints to make them mate up but I never tried it.

Title: Re: exhaust pipe blueing
Post by mick on 10/11/08 at 20:53:33

I'm not sure this works or not,but I heard if you wrap about 18" of thick copper wire around the header as close as you can to the head,it will stop the pipe from bluing,if you polish the wire first it looks kinda retro, I would have done it to my bike but the pipe was blue when I got it,it only supossed to work on new pipe ????????

Title: Re: exhaust pipe blueing
Post by justin_o_guy2 on 10/12/08 at 05:01:07

When I got the Supertrapp the instructions were Clear, CLEAN the thing up, the manufacturing oils would discolor & the warranty wouldnt cover it.

Maybe your pipe needed cleaned good first?

Title: Re: exhaust pipe blueing
Post by 12Bravo on 10/12/08 at 08:06:59

I made the mistake of NOT cleaning my supertrapp good enough and it blued on me. IF the bike is still running good and there isn't any air leaks then that is probably what happened (not cleaned enough).