I performed the recommended (finger tight) chain adjustment on the ZRT600 over the past week. This adjustment brings the adjuster bolt head flush with the lock nut. I would assume a chain and/or gear and/or sprocket replacement would be in order. Would a wider 15mm chain/sprocket/gear setup fit? Should I stick with stock parts? The oil drained from the case looked fine with no obvious metallic content. Any help would be appreciated. Thanks again.