I installed Scotts washers in my Tr6 motor, but I havent got it going yet. The washers are beefier and have more surface area. You will need to give Scott an exact total thickness of the washer you want, he does not fill orders by giving him oversize dimensions. I ordered a washer to allow for .004 clerance but ended up with around .0035, so his washers come a little on the tight side. They are stout and look like they will work well. They seem to slide into the groove a little tighter than a stock washer--almost like being spring loaded, so they might be hard to fit from the bottom with the crank installed. I only installed one of his washers on the thrust (flywheel side)and a stock on the other as it is the flywheel side that gets all the abuse.