I've read old posts until I got back to '01 and am still pretty confused on jetting. I just installed a Yosh. full comp pipe and a K&N with no box mods. I purchased a dynojet kit figuring I would need to re-jet. After installing the pipe and filter I ran it around in my pasture (pretty small area) for about 10 minutes and pulled the plug and it appeared to be running a little rich, but seemed to run just fine for that short time I rode. I plan on riding at sea level next week, but right now I'm at 4500 feet. Should I rejet?

 

Unless you rejet you will not get all the power you should be from the pipe and filter, you are flowing more are at both ends but no more fuel.

 

You should at least cut the flaps out of your snorkle and put in 146/148 main jets.

 

OK. You guys would be proud of me!!! Here's what I just finished doing.
I cut the snorkel out.
Rejetted with the Dynojet 146 left/ 148 right including changing needles w/clip on 4th notch
Started up first try.....after I got gas through the carb.
Can't wait to try it out tomorrow when its daylight. I think the neighbors may not like the Yosh!!!!
Thanks for the input guys. That's my first carb job and only took 1 hour 45 minutes.

 

Im not ******* you here just stating a fact. Only takes me about 20-25 minutes. Can you tell I have done this over and over????? Good work though. First time I did it I was a tad bit scared because my Raptor was fairly new and had never taken it apart. Now its like second nature.