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Message started by csparks300 on 06/06/07 at 07:51:01

Title: Header Pipe Brown..
Post by csparks300 on 06/06/07 at 07:51:01

As I have been riding my bike (stock) I've noticed that the top of the header pipe was starting to turn brown. My guess was that the bike was getting to hot from running to Lean or a gasket leak at the pipe.
So I have recently put on a SE muffler (which sounds great by the way) and put in a 152.5 and adjusted the idle, I left the stock air filter so that I don't put it back into a Lean condition and left the white spacer and the bike runs great..

Ok, so to get to my question...I've noticed the SE muffler is starting to turn a little brown in the middle of the pipe. Am I still running lean and hot or am I way off the mark here? Thanks....

Title: Re: Header Pipe Brown..
Post by Greg_650 on 06/06/07 at 09:45:33

Only changing the main jet, only changed the mixture in the upper half of the throttle range. With the stock spacer and pilot jet, the mix could still be lean (or leaner) down in the lower throttle range.

Title: Re: Header Pipe Brown..
Post by Savage_Rob on 06/06/07 at 10:17:27

Yup, the spacer probably needs to be shaved. That would enrich the midrange.

Title: Re: Header Pipe Brown..
Post by csparks300 on 06/06/07 at 11:34:55

I see..well I'll shave the spacer then and see how she acts. I choose not to because after I changed the pipe I didn't have any backfire and it ran strong.

Thanks for the info guys.

Title: Re: Header Pipe Brown..
Post by Savage_Rob on 06/06/07 at 11:43:37

What year is your bike? I think the 86/87 models had needles with multiple notches and you wouldn't need to shave the spacer. If it's a later model, then shaving (or replacing with a similar, but thinner, spacer) is in order.

Title: Re: Header Pipe Brown..
Post by csparks300 on 06/06/07 at 12:07:05

it's a 99, so it has the spacer...

Title: Re: Header Pipe Brown..
Post by Savage_Rob on 06/06/07 at 12:46:01

The older ones have the spacer too. It's just that the newer ones don't have adjustable needles - along with a few other changes.

Title: Re: Header Pipe Brown..
Post by tuxedo on 06/06/07 at 13:02:56

i have never noticed that my needle was "adjustable." my bike was built 04-1986. Where's everyone seen "adjustments" on the needle?

Title: Re: Header Pipe Brown..
Post by Savage_Rob on 06/06/07 at 13:28:50

In the stock needle on my 98, there is a single slot with the clip inserted into it. The DynoJet needle has something like 6 or 7 slots, enabling you to move the clip up or down on the needle. I've seen others post on this site that their 8x model had 3 slots for the clip.

Title: Re: Header Pipe Brown..
Post by tuxedo on 06/06/07 at 13:37:06

holy crap. I'm gonna have to tear my carb out and take a look. I'm 99% sure I would've noticed that, because I looked for it. I'll have to look to be sure, though

Title: Re: Header Pipe Brown..
Post by verslagen1 on 06/06/07 at 13:55:43

If I remember correctly, my '96 has 3 slots.

Title: Re: Header Pipe Brown..
Post by Five_Points on 06/07/07 at 05:12:46

Hey csparks300

instead of shaving the spacer, go to your local hardware store and get you a couple #4 vinyl washers. they're the same size, only thinner. I think I only used one washer and it halved the thickness of the spacer. that way you still have the spacer if it doesn't work out and you need to replace it

Title: Re: Header Pipe Brown..
Post by Savage_Rob on 06/07/07 at 05:27:50

Five_Points wrote:

Just be sure they're petroleum resistant or you'll have melting washers crapping up your carb.

Title: Re: Header Pipe Brown..
Post by csparks300 on 06/07/07 at 06:01:39

I like the idea of the #4 washers ( Thanks Five_Points)as long as there petroleum resistant (Thanks Rob.) While I'm at it I'll be changing those softy screws with Allen heads..i think they have one takeout left in them.

Well I took the bike out last night and gave the new pipe some breakin time...I could def. tell is was still lean on the bottom end, but the Top end is very nice..With a buddy last night I gave it a little WFO and I was actually keeping up, when I looked down I hitting 98mph..my buddy confirmed it, he was shocked...same here.

Thanks guys....for the help.

Title: Re: Header Pipe Brown..
Post by Greg_650 on 06/07/07 at 06:52:59

Savage_Rob wrote:

You're right about the needle, but just a footnote on this one....

The reason that the idea was developed (~5 years ago) to increase the main jet to a larger size, is because the '86/'87 models used a 155 anyway.

Title: Re: Header Pipe Brown..
Post by Ed_L. on 06/07/07 at 07:53:20

The brown spot on the muffler is normal, it is where the internal baffle is located. I've had two different sporty mufflers on my '02 so far and both have developed a brownish/blue area part way down the length. I'm running a 152.5 main jet which is a little lean for my setup so the blueing was expected on my ride. I like the effect, makes the bike look like it has been ridden, not polished. Follow the rejet advice to get your's running a little more on the rich side.

Title: Re: Header Pipe Brown..
Post by Savage_Rob on 06/07/07 at 10:55:11

Sooooooooooo.... as the Rolling Stones said, Paint it black!

Title: Re: Header Pipe Brown..
Post by Ed_L. on 06/07/07 at 12:22:36

LOL ;D