The quads, what a crazy thing, they were called "Enforcers" and we had one in the shop for many years that was a kick start 600 and was a pig of thing when it got hot. From memory they were only made from 98 to 99 with even less parts available for them now than the bikes. For the early bergs, ie pre 2001, engine parts are near impossible to get. If, and its a big if, you can find an original conrod you'll be staring down the barrel of between $600 and $800. The 501 engine I have will need all bearings, a conrod, piston, a set of valves and an oil pump. Add the usual gaskets, seals etc and of course roller rockers and the parts bill is $2500 alone!