[casketmaker]

I recently put a Yoshimura Exhaust on my 660 Raptor. After I installed the exhaust and rode around the yard for bit I noticed the header pipes got so hot they were glowing orange. Is this a bad thing?

 

[willykiller]

Did you rejet the carbs for the change in exhaust, and the Yoshi pipe is thinner and will show its heat faster, exhaust temperature will get as high as 1200 degrees F..........

 

[casketmaker]

wasn't sure if i needed to rejet the carb since i took one header pipe off and put another one on. what kind of rejetting do you recomend?

 

[willykiller]

wasn't sure if i needed to rejet the carb since i took one header pipe off and put another one on. what kind of rejetting do you recomend?

What type of header was on it before and was it similiar in size...........

 

[casketmaker]

It was the stock exhaust, from header pipe to tail pipe.

 

[willykiller]

Make sure you are using #25 pilots, and up the mains about 5 numbers and maybe raise the needles, are you using aftermarket needles..............

 

[casketmaker]

This is my first modification as far as the engine goes, so everything is stock, pilots,mains, needles, it all the original stuff.

 

[willykiller]

This is my first modification as far as the engine goes, so everything is stock, pilots,mains, needles, it all the original stuff.

Then I suggest getting #25 pilots and bigger mains..........