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Message started by Veritas on 09/03/06 at 10:02:49

Title: Gold pipe...
Post by Veritas on 09/03/06 at 10:02:49

I understand the gold pipe is a sign of a rich condition. My stock 05 S40 is starting to show some gold at 2000 miles. I thought the bikes came from the factory lean, thus bluing the pipe. I am still getting all the backfires that come with the lean condition. What could be causing this?

Title: Re: Gold pipe...
Post by serowbot on 09/03/06 at 11:11:50

The pipe will go gold first, then blue, then blue black. It means hot, hotter, hotter. Running lean or rich can cause it.
If this is new to your bike it may be environmental.

In general...

thinner air = go leaner (Barometric pressure decrease)

hotter air = go leaner
more humidity = go leaner
higher altidude = go leaner

thicker air = go richer (Barometric pressure increase)

cooler air = go richer
less humid = go richer
lower altitude = go richer

Barometric pressure effects jetting in a big way, humidity, air temp, and elevation. Some places have extreme variations in barometric pressures and if you live there, your pipe will blue. I live in the high desert and temps can change 40 degrees f in a couple hours, humidity can vary wildly too. No way to jet for that.

Gold and blue are pretty!

Title: Re: Gold pipe...
Post by Veritas on 09/03/06 at 11:24:07

So what you're saying is I should still do the spacer and jetting mods? I live on the east coast where one day it can be 60 and huimid, while the next day it can be 85 and pleasant. You never know around here.

I guess I'll just start at the 1/2 spacer and brass plug screw and see what happens.

Oh, and if anyone around the Boston area can help me get my carb apart, I'd be greatly in debt to you and your family. Yep, I stripped one of them and can't get to two of them.

Title: Re: Gold pipe...
Post by bholly12 on 09/03/06 at 12:16:21

You should go ahead with the spacer & air screw adjustments to get rid of that irritating backfire!

I had trouble with the carb top screws also, a fat screwdriver and needlenose vise grips got them no problem. You should be able to clamp down hard enough on the stripped one & one's you can't reach well to be able to remove them without using a screwdriver.

And of course replace the screws with hex ones when you're done.

-Brad