Okay the question is what jetting combo has worked best for a 04 Raptor with a complete Big Gun exhaust (Race slip-on & Header), K&N with outerwear with billet clamp, no lid, uni-fliter on the crank case tube since I'm running no lid. Typical stage 2 power up kit including Dyno jet kit. A 146 in the left and 148 in the right because I'm under 3000 ft in Vegas. I have Big Gun's recommendations as well, a 155 in the left and 160 int he right w/o lid. Is this the same jetting equasion because DJ uses the own number system or will one run better then the other? Also dyno-jet recommends the the needles on grove #4 from the top, Big gun says use the stock clip setting. (not sure what stock setting was)
So any help here to identify the difference between the two would help. Thanks.

 

You can't really equate the Dynojet numbers with the stock style jet numbers. 155-160 stock style jets would be about right at your elevation, as for Dynojet, their advice has been good for me jetting my YFZ.

 

DJ needles are much different than the stock needles. They allow more fuel to flow. Stage 2 from DJ is with the lid ON and the snorkle trimmed. those recommendations are not applicable to your no airbox. the fastest stock raptors with no lid and a good pipe run about 160 to175 DJ mains. After 150, I believe the DJ numbers increment in 5's not 2's below 150. so I would try 160/165 and so on using DJ jets and needles.

 

Thanks for the help guys! I'm never in the sand, or water so I want to run with the lid off. So a 160/165 is what you recommend, have you run this setting? Do you know someone that has run it and are they running leaner or richer when they check the plug?

 

My opinion is that DJ's recommendation of the 4th clip is at sea level. They don't recommend settings for different altitudes. At 1200 feet, with the needle in the 4th position, I couldn't get to WOT, so I moved to the 3rd and the problem was solved. A majority of the people I read and met run the 3rd also. If you hunt on the internet for a DJ to mikuni jet convertor, you can buy mikuni jets and substitute them for the DJ. 160/165 DJ was a suggestion, but I would get 160-180 DJ or mikuni equivalents and experiment.

I never had much luck with plug readings when fine tuning. I was always able to get real close and the plugs looked very similar to me.

The only way to know for sure is dyno tuning or a wideband O2 setup. I'm in the process of finding the lowest cost WB O2 setup and building my own gauge.

Don't forget to get your floats right before tuning.

 

Thanks for the advice. I think I'll pickup some jets and try it out.