This might be a stupid question but i am putting together a 1997 XP 800 engine that i did not pull apart and was wondering if the thrust washers that go between the piston and the con rod are really necessary as i cant find any for sale. When i bought it it had no wrist pin bearings and only one set of thrust washers but i have some wrist pin bearings from my 720. They are the same except i believe they are wider and the thrust washers dont fit with these. Can i just use the 720 wrist pin bearings or where can i get thrust washers from? Cheers