jetted the carb correctly for a full hmf exhaust on a 660r, am i to lean or too rich, how do i fix it or can i just leave it. i only saw it at night and havent looked at it in the day. people say that it is very common for aftermarkit pipes because their thin (bigger diamiter) but someone told me that if they get too hot the can actually mealt the header is this true??? how bad is this for the quad? thanks for the help.

 

lean

 

what do i do, go up a jet size? i already tried turning mixture screw out and it didnt do nothin except change the idle

 

could be jetting or could just glow. my buddys yoshi header on his wolverine used to glow when we rode at night for a long time. never had any top end problems in 2 years though

 

can it really mealt it though or is that bs, what would going up a jet size do?

 

If you increase your jets it will make your bike run cooler. If you lean it out you will make it run hotter. Sometimes leaning them out gives you more power. But as far as the Header melting goes i wouldn't think it would ever melt your piston would either seize or something would happen before you headpipe would actually melt.

 

so is is worth it to go up a size in jets, i have 150 and 155

 

What other mods do you have and what are your other carb settings?

 

air filter adaptor plate with foam air filter, drilled 1inch holes in air box with uni air vents in them and thats it.

 

oh and 2.5 turns out on the mixture.