i need some help here....just got my raptor back from the shop with a new header installed...well i ran it for 3 minutes and the first ten inches coming out of the block are bright red!! i turned it off right away and will call the shop in the am....what did they do wrong??

 

they didn't adjust the carburators, half a turn out on the air mixture screw should fix

 

they also cromed it for me and now the first half is a orange gold color...they are going to have to dip it again you can count on that!

 

<< they also cromed it for me and now the first half is a orange gold color...they are going to have to dip it again you can count on that! >>



Well you are right on that. But it will turn blue. There really is not any way to stop that. There is a polish for it but it just happens to chrome headers.

 

what does the polish do and does it work better than nothing at all?

 

I cant remember the name of it but it polishes it away with alot of work but it will soon come back.
It is just because of intense heat.

 

I have been told that the Raptor motor runs notorious HOT and that you should NEVER let the motor just idle for a period longer that 2 minutes. Apparently Yamaha was aware of this issue and that is why the Raptor has a cooling fan for the motor. While riding, the motor cools itself from the passing air, but at idle the Raptor motor cannot dissapate heat properly. Thus, your header pipes start glowing, according to reports from the people at Big Gun and Trinity, they had run into situations where they have seen people melt their cylinders because they let their engine idle for 10 minutes (or longer).

Look for alot of cooling products for the Raptor motor in the future to resolve this problem.

 

[img]i/expressions/face-icon-small-mad.gif[/img]its common on raptor head pipes to glow a little red after its sat at idle position for a while, but if thier still glowing as your riding your machine, its running lean. the only way to properly jet your machine is on a dyno with an exhaust meter.

 

CLearly a lean idle circuit condition. Install 27.5 pilots.

 

I would be concerned, but the header pipes glowing is not all that uncommon, especially if you ride at night. Friend had a warrior which would glow, my YZ 426 glows.

I would pay attention to a potential lean condition, and see if that helps.

RM