503F came with a 5gal tank, needs 600HO stock 9gal, $750.00 12gal avail. 503F, and liquid owners should work together and split $ difference.
                                                                                                                                                                                                                                               
503F Original ski was spoon shaped with five carbides no twin axis pivot, needs 04 and on two carbide ski, looks like a larger version of the Ski-Doo Renegade Ski.
Anti darting guides should be reversed to outside of ski edges 05, need added on older ones.Simmons makes a ten inch ski with mount for Hawk.

Ski setback is nice for new riders, and road riding, but orig straight on 02-05 is nice to have in deep, or wet.

503f Mik. carbs stock jetting 220 pto, 205 mag, 4-6000' elevation needs 180, 170. 600HO stock 04-05 350 4-6000' el 270, 06 420 4-6000' el 340-.

Powerblock primary clutches easy to work with 503F came with 9 weights x 3, 600HO had one 1oz, and maybe 4-5 small wts x 3.
Get a Tiny Tach remove wts til 7300rpm 503F, 8100rpm 600HO.

Caution with different primary, can grind through belly pan, 800HO has TRA and added guard on bottom contact area. Polaris P-85 from older Fuji Polaris bolts on 503F. TRA off Summit, other Ski-Doo, Comet, or other for 600HO.

Have found all 503F, and 600HO secondary clutches to have been set at 0 spring tension.
Stock belt rides low in secondary eighth inch, try Polaris XLT belt.
I would like to see a Team secondary setup.

Wraparound aluminum hand guards hold up better, and help when picking back up from helping twoski turn arround on the hill.

Bar risers help. Tall guys like taller seat foam. Bolts in brass bushings on swing arms need to be replaced with longer through bolt, and nylock. Bushings countersunk for new bolt shoulders.

Rails can poke through track, Arctic Cat wheel kit for this problem.

Head light prone to burn out, leave unplugged ground to ground till needed.

Fork seals can usually be repaired if leaking, no dirt to damage.

Suspension questions CB Racing 360-957-3385

503F sits 4" lower then 600HO.

A Snow Hawk is a Snow Hawk their all worth the same$ to me, the 503F could still be the only one made and my 6'5", 285lbs would love it.

The JR 60, and 120 are no slouch either!