I have a knock sensor off a 2007 Skidoo Summit 800 HO. Good working condition.  Please see all pictures. 

This will fit 2006-2007 Skidoo Summit800 HO and more!

Part # 420664035

This will Fit many applications so Please check your part # for compatibility!

I SHIP FAST!

Inventory note:07summit800x2  07machz1000motorbin

ALASKA PLEASE CONTACT ME BEFORE PURCHASING TO GET THE ACTUAL SHIPPING RATES DUE TO SIZE AND WEIGHT!