There are two versions, depending on what year - around 1996? was the gls (ground linkage system) version (swingarm above the bb) and then 97/98 was the pro active version (swingarm away in front of the bb). i had one of the pro active versions. Rode really well and wish i didnt sell, as would like another. But if its a gls, might be elastomers (which may need replacing) or could be the ods (oil damped system/shock) spring. If, 97 the pro active, then it be a noleen nr2 and if it has problems. Then they can be rebuilt