How to check swing arm bearings?

RonKZ650 wrote: They used two heavy duty, good quality roller bearings. Like all the KZ1000E parts, basically the best of the best quality and heavy duty, made to last. I wouldn't worry about the bearings unless you're up in the 200,000 mile area. Age doesn't matter to a bearing.

RonKZ650 wrote: You guys are all talking of other motorcycles which use either a sleeve and bushings or a sleeve with little needle bearings. Yes these need lube quite often, and even then aren't heavy duty. The shaft used real roller bearings. Not to say they don't need lube, but chances of them being in bad shape is definitely less than on other Kawasakis.
They built everything on the shaft heavy to last, then in 1981 went to the KZ1100 shaft and all heavy duty was replaced with regular duty parts.