My 70 year old friend has a 1999 Formula Dlx 500 and gets 7-8 M.pg. He took it for a tune up at the local Skidoo dealer and it's still getting the same mileage. Remember this guy seldom sees 60mph and is not going to be blasting across any lakes. The piston tops have very little carbon and look clean and oily wet ? Anyone have any jetting Recomendations. Thanks !

Present settings
Left
M.J. 300
A.S. 2 turns out
P.J. 45
Float 18mm
Needle 5DGY9 2nd notch from top with nylon washer under clip
Slide 2.5

Right
M.J. 280
Rest the same

(Looks like this sled but, only a 500cc)