I recently installed an HMF utility slip on and got the trail kit including a foam filter now I have 2 and 138, 140, & 142 jets. HMF recommended the 140 since that is what worked best for they're testing in OHIO. I installed the 140 and fired her up and the bottom end torque seemed to be better but I promptly lost 12-14 mph top end and she was poppin at top speed obviously too lean right, so HMF says try the 142, I install the 142 and picked up 1-2 mph but still poppin. I called hmf back and speak to a self proclaimed jetting guru, he says oh no you live in Florida near the coast, lots of sand etc... you need at least a 150-152 jet. So I special order a 147.5, 150 and 152 jet. I installed the 147.5 just to be conservative at first and now I lost the 1-2 mph I gained with the 142, but the poppin stopped now instead I am hittin the rev limiter at around 38mph. Will an even bigger jet improve the top mph if I was already hittin the rev limiter at 38mph. Stock it went 54mph and with 26" 589s the speedometer still read 52mph. HMF also says to ste the air fuel mixture screw to the highest smooth idle, approximately 2.5 turns from the bottom, I have'nt made any adjustment to any screw because it idles great the way it sits, besides w/o a repair manual I dont know where or which is the air fuel mixture screw. Any suggestions or comments would be greatly appreciated.

 

I think the dynojet kit is foolproof.....I had to install a new needle(came in kit)...and other stuff to make the jetting work correct

 

The mixture screw will only effect the idle quality. If its not popping on decel..its rich enough. The screw can be found on the underside of the carb, forward of the float bowl. Its not the easiest to see, or reach.
How do you know youre bouncing off the rev limiter, and not just a too rich stumble?
Is the intake all stock...except for the new foam filter?
Try pulling on the choke at wot, and see if things improve or get worse. The enrichener (choke), should make it a bit richer, and will help with the decisions to go richer or leaner.
As an alternative, try removing the air box lid, for another run. This will lean everything out, and the low to midrange may have issues, but youll be able to test out the top end, If it improves, its too rich, if it gets worse, it was too lean.
Usually, when the top end starts to go away, the clutch needs relubeing.Also The bigger tires usually hurt the top end, even though they have a bigger diameter.The horsepower may not be enough to overcome the weight and taller gearing of the new tires.

 

Thanks for your suggestion hondabuster i ran it with the lid off and picked up 3 mph, now i need to down jet possibly a 144 or 145 since 142.5 was lean and 147.5 was too rich. By the way if you read this reply and its not to much to post here please explain relube the clutch. Thanx

 

Its kind of involved, and the best bet is a service manual. But to give you an idea of whats invovled, theres a couple of web sites which detail what to do. They are written for a grizzly, but it very similar to the kodiak.
One is in nyrocs maintance area, and then theres these two
grizz maint
grizzhoppers site