Originally Posted by
Lochii
I won 2 brand new piston/sleeve sets on ebay last night, 15 UK pounds each, hah! A S3 and S5 set. I read they both fit in the s7 case, and my dad happens to have one of those. I guess I'll try the S5 first, for my truggy.
Those will fit any of the S7, WS7, or WS9's as well as the S5 and S3's they were made for. They are all square stroke engines tho so your not going to have a ton of bottom end right off the bat, you will have to play around with gearing and clutch setup to get the bottom end just right.