How often should I grease swingarm/rear suspension bearings?
Posted February 23, 2004 - 02:47 PM
Posted February 23, 2004 - 03:28 PM
Posted February 23, 2004 - 07:45 PM
Posted February 25, 2004 - 08:23 AM
Posted February 25, 2004 - 08:47 AM
Posted February 27, 2004 - 06:50 AM
I'd say to check the axles for scoring too.
Posted February 27, 2004 - 07:22 AM
Posted February 27, 2004 - 10:01 AM
Posted February 29, 2004 - 03:00 PM
The shock linkage had this strange looking stuff like it was injecteded then semi-hardened. The needles were completely incased and in mint condition. Is this something Yamaha uses?
that "strange looking stuff" is an oil-impregnated polymer, more specifically called "microporous polymeric lubricant (MPL)". yes, it is the yamaha production lubricant for the swingarm bearings. MPL is not field serviceable -- if it gets damaged in any way it must be removed from the bearing and replaced with a high quality lithium complex or aluminum base grease.
you can get all of the details of regreasing the swingarm, including disassembly pics, here in the 250F FAQ:
also read this entire post and the links therein:
as noted in the FAQ link above, DO NOT CLEAN THE MPL WITH SOLVENTS. doing so just depletes the oil that is in the polymer "sponge" and will cause lack-of-lubrication problems down the road. for more info on the MPL polymer itself, click on this link.
jim aka the wrooster