K-TRON 24 #1 Posted December 30, 2022 Does anyone have a 400081 piston or 200023 rings for an Ohlsson & Rice 20A engine? I havent been on here in a few years. I finally scored a 20A for my collection. It does run, but the piston is rather scuffed when looking thru the exhaust port. I will have to pull the cylinder and check it out. These seem to be very hard engines to find. I only have one in my collection of ~25 O&Rs. Were they only used on chainsaws, hedge trimmers and an outboard? Seems like there are none of them out there compared to the common O&Rs. Chris Share this post Link to post Share on other sites
Wallfish 698 #2 Posted December 30, 2022 Welcome back Chris! Unfortunately I don't have any 20A parts. Share this post Link to post Share on other sites
CNew 404 #3 Posted December 30, 2022 I’ll look through my stuff tomorrow. I have an old beater 20A chainsaw that is stripped, I’ll see if it still has the piston. Not sure if the piston is included in this one… https://www.ebay.com/itm/234187036876?hash=item3686a298cc:g:kbsAAOSwuWBhQDYD&amdata=enc%3AAQAHAAAAkB8StaffjwMooEwjSl2g9O9GWocNA9X5kA%2F34nltjlIugpI2AyBSPuI2gru%2F83Ph8WDDSUPcYFnMbv6SrvqRh23qyiNnt5rcE0Sxc5OSE4Kx%2Baoeca3cLK70ZNJq5eOUrfE6QniLPZrGr6wNb%2B9DQodjhuUbOSKhQUZcWGukNLUITjyPL5BMqLTH%2B%2BmjkpQEQA%3D%3D|tkp%3ABk9SR-akmJSsYQ 1 K-TRON reacted to this Share this post Link to post Share on other sites
K-TRON 24 #4 Posted December 30, 2022 Thanks! I appreciate it. I think mine was run on 50:1 or straight gas at some time. It is on an insecticide sprayer so it is certainly worth fixing! I hope to pull the cylinder soon and see how the bore looks. It appears to be a 'chrome' plated bore which I was surprised at. I was hoping it would have had a cast iron bore like the little compact engines. Chris 1 Mike in NC reacted to this Share this post Link to post Share on other sites
CNew 404 #5 Posted December 30, 2022 Cool, I’ve never seen a sprayer with a 20A. Definitely keep me posted once you open it up and check it out. I’ll see if I can scrounge up some used parts, hopefully in decent shape. Share this post Link to post Share on other sites
CNew 404 #6 Posted December 30, 2022 I sent a message to the seller on eBay with the complete head, piston & crank. Said it doesn’t have any scoring - might be worth the gamble, especially at that price which is really reasonable. 2 K-TRON and Wallfish reacted to this Share this post Link to post Share on other sites
K-TRON 24 #7 Posted January 10, 2023 Thanks for the link, I have bought from Bryce before, he is a little less than honest with his descriptions. I think it is still worth the gamble because of the price. I will likely purchase the crankcase this week. Chris 1 CNew reacted to this Share this post Link to post Share on other sites
K-TRON 24 #8 Posted March 12, 2023 CNew, I ended up buying the O&R 20 crankcase off of ebay. I am not sure what to think as of right now. There is some very odd wear patterns in the plated cylinder. I am wondering if this engine has only a few minutes of run time on it, as the rings seem to have been jumping in the cylinder. I will put the cylinder in my Sunnen honing machine and see what a few revolutions do with the junior hone, carbide stones and flood cooling. The piston looks phenomenal. I hope to use the best parts possible to fix the 20A powered sprayer I have. Chris Share this post Link to post Share on other sites
CNew 404 #9 Posted March 12, 2023 That is an interesting pattern. The condition of the piston and rings look new. Maybe the pattern is as you suggest and it’s just some early wear-in, barely looks used. A light honing is probably a safe bet. Share this post Link to post Share on other sites
