>A friend of mine just purchased a 96 Ultra. He brought it to his local Polaris
>dealer to have the carbs synced and checked out.(of course the price was right
>on this sled) He was informed that there were four updates for this sled. 1)
>primary clutch spring, 2) jets, 3) expansion tank replacement, 4) rear
>suspension bolts replacement. Our main question to you present ULtra owners is:
>what does the primary spring change doing to the sleds performance?
>The sled seems to perform well as is, very strong mid range and good top end
>too! This sled is truely a great trail sled!
I have an Ultra RMK and would agree that the Ultras have pretty good
mid range and top end. Mine came with the blue spring that engages at
5000 RPM and I put in the silver/gold spring which was the recommended
stock spring for 0-3000 ft which the Ultra SP would have come with. I
was getting severe bogging on takeoff with this one which causes
engagement at 4000 RPM. So I think the updated primary spring must be
to increase engagement RPM and reduce the bog on bottom end. Also, were
the jet changes only for the main jets or were they for the pilot or
needle jets as well? The only update bulletin I received was for the
coolant tank replacement. The stock main jets on the RMK are probably
about right for the high altitude running (6-9000 ft). I have been
running 320 jets at 2000ft.