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Mobil 1 20-50 Syn in the engine and Mobil 1 75-90 syn in the tranny and the rearend.
I have a Progressive shock I ran on my K that is trash. The shock body itself wore out around the mounting eyes. There was vertical travel in the shock I noticed while washing the bike. I bought new spherical bearings from Progressive and installed them, but the holes they fit in were hogged out. This is the problem with using heim joints or spherical bearings to mount shocks on a street bike.
I run 42 psi front and rear on radials, and that is as much about steering feel as it is to protect the wheels from damage on LAs worn out freeways.
Detbmw,
That high of a pressure is only necessary on the flexible side wall radials (radials are NOT recommended for the stock rims on your K75S) . High pressures are not needed to protect your Y-spoke wheels from damage. Only the later 3 spoke rims have bending issues (which is what 42906 has).
You don't have a paralever (but you could install a new tranny, driveshaft, paralever swing arm and final drive and a few other parts like 42906 did). The recommendations don't apply to the bike YOU are buying.
detbmw,
It's Saturday, have you gotten your K75S yet? It's not silver is it?
How does it feel to become a Brickhead?