Allen-Bradley P420837242 Rotary Valve Shaft

This aftermarket rotary valve shaft, part numbers 420837242 and P420837242, is a direct replacement for Ski-Doo rotary valve assemblies used in certain late‑1990s two‑stroke snowmobiles. The 4208372x family includes related shafts, and 420837250 is a later replacement that supersedes 420837242 as part of interchangeability among numbers in the same lineage. In practice, this shaft is associated with 1998 Ski‑Doo MXZ 670 models, where it sits in the rotary valve drive that times the intake porting of the engine. As an aftermarket component, it is designed to match the form, fit, and spline engagement of the original shaft for compatible assemblies, enabling maintenance without engine modification. Use this part to restore proper valve timing and reliable operation in affected Ski‑Doo two‑stroke engines, following standard mechanical installation procedures for rotary valve shafts and referring to the engine service manual for torque specs and alignment guidance.