Robust stroker in 12hp tune, derestricted by using different shims in the KIPS linkage to make 24hp when it maintains reliability for 20 to 30k (when piston, small-end and crank seals go). Can be tuned to 30hp when it breaks quickly. More often crashed than seized. Look out for rear disc seizure, loose chassis bearings, monoshock wear and electrics. Not that many useful or cheap spares in breakers