The most reasonably priced component used on the Trx300fw Fourtrax 1989 (k) Canada Crankshaft/piston is the Clip,piston Pin.
Some items from this specific schematic: Piston (0.75), Shaft Comp,balanc, Brg,ball 40x76x18, Clip,piston Pin.
nineteen components are shown in this Trx300fw Fourtrax 1989 (k) Canada Crankshaft/piston exploded diagram.