I had a '92-great bike! To make the bike more tractable for eastern (NY, PA, NJ) enduros & scrambles, I swapped out the aluminum clutch plates for steel (Yamaha replacement parts), this added inertia was noticeable, though i also added a 12 OZ. flywheel, which made the power deliver just electric. It was nearly impossible to stall the bike and perfect for gnarly, tight root infested trails. Yamaha also had an intake spacer that broadened the power delivery. In all, my changes made the bike trialsy, though reliable and easy to ride in enduros. Other more personal changes included a seat foam (taller) kit and pro-taper bars.
With the mods removed, the bike was an able mx'er.