I replaced the linkage bearings on my GP300 at 70 hours & thought that had I regreased sooner they might have lasted longer.
After 100 hours I noticed some slack at the shock at the topping out point when I lifted the back of the bike. Pulled down the linkage bearings again to find they were OK.
I ended up replacing the lower shock eye bearing & even though the old one looked OK there is no longer any slack in the shock.
Might be worth a look, you can buy them as a Yamaha part in a kit with the lower bush, bearing & seals.
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GG GP300 18
KTM 350EXC 17
GG EC 450, GG EC 250 08, KTM 525 EXC 06, KTM 400 EXC 01, XR400 97, VTR1000 98, VFR750 95, Husaberg FE400 96, RMX250 91, Maico 490 84, IT250J 81, RM250C2 79, Bultaco Alpina 250 77 - All sold
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