i have an 04 raptor with a proflow airfilter and dmc alien full exhaust system i jetted it with the jets they said to use 155L 160R 27.5 pilot stock needle my head pipes red turning red does anybody know what i should do?

 

There are alot of pipes that run Hot and glow red at night time.
Does your bike feel like it is running lean? If it feels lean then it probably is and thats what causing the red pipe.
Just double check the plug. What the manufacture suggests isn't always right. You have to figure in your altitude, tempature, and other mods that you have on your bike. Jetting can vary from quad to quad even tho it has the exact same mods.

HOpe this helps
Junior

 

at first i used a dyno stage 2 jet kit for full aftermarket exhuast and air filter it was very lean so i went to dmc's web site they said to use the 155 160 main jet 27.5 pilot stock needle do you think it is my mixture screw?

 

It might be

just dont change too many thigns at once in case you screw something up.

 

Mob, three things will cause what you are describing.

1. A lean mixture. (The extra O2 will act like a cutting torch when you hit the O2 leaver, it gets hot quick)
2. Late timing. The piston will come up, the plug will light, and the piston will fall away with the fuel still burning down the hole. This will cause the pipe to get real hot because of the late burning fuel.
3. Slow burning fuels. If you use a fuel that is slow burning it will cause the same problem as the late timing. Using high octane race gas in a stock engine will do this. Also, nitromethane will burn so slow that it even burns out the pipes, thats why you see the 3 foot flames at night on a top fueler.
You will have to figure out which one of these tips fit you best to fix your problem.

 

i fixed it thanks for the help

 

what was it

 

it was to lean with the dynojet stage 2 jet kit dmc also said they will glow red at an idle and at night