Iv got a briggs model 8 off a bolens power hoe. It's in pretty rough shape it stuck pretty bad and will need an exhaust valve Just that I know of know. It may need a piston and I'm sure rings by the time i get it unstuck. My question is whether this thing is worth saving? The only piston iv found is on ebay and it close to 100 bucks and iv not found a valve. I'm just wondering if I'd have way more in it than I should. Or is there a better place to find parts than I know of? Thanks Wil