Join Date: Mar 2008
Location: Alaska - 63North, 162West
As long as you have it open, I'd do a crank inspection and, assuming the journals and inside bearings are good, replace the seals, for sure, and outer bearings as needed.
Many times these engines can wear the journals that enclose the outer bearing race. You can make some remedies work, but too much play means replacement time. I intended to re-ring (and piston) my old '97 488 fan when it was around 10,000. I ended up putting it off until it was up to over 13,000. The cylinders were still within wear spec so I didn't oversize, and the pistons showed nothing to indicate stress so I kept them. I ran that engine to over 25,000 before it spit the rings. One piston was beginning to show skirt cracking - but hadn't dropped anything yet. The other piston was still intact in the skirts. Polaris really dropped good fans when they quit those old 340s, 440s, and 488s.
Formerly known as 63November, and before that as Golsovia.
Riding since 1983.
-Yamaha Enticer LTs
-99 Arctic Cat 550 Panther 14,000+ miles
-08 Ski-Doo 550 Backcountry
-340 eBay Edge from AK, and 10+ other states
-'11 AC T570 brand new...4000 miles