Is the black with pink on it the primary factory spring? What would be better at 2300 ft?Any changes to jetting be required at this altitude?Currently stock with a diamiond g module..mabye I should replace that for dynatek cdi?

 

I do not know what the factory spring is and you also didn't say what bike your running. LOL As to which spring is better, that depends on how you plan to ride and what tires you are running. For general easy trail riding the stock spring is OK but I like one with a slightly higher stall, easier on the belt. For drag racing I like the epi red for stock bikes. If you mudding then it depends on the tire size but you'll need a spring with a high stall and low shiftout to keep you in the powerband. For jetting it's hard to say. Every bike is a little different and if it's running good and dosen't seem to be running to warm then I probably wouldn't mess with it until you get an exhaust, if ever. The dyna is a better unit than the Diamond G for the 650s and 700s but some people have reported having a small miss at 1/4 throttle on the 750s. My neighbor and another friend both have dynas on their 750s and neither have had problems.

 

Brute FOrce 750 06 with 27" mudders.