K-TRON 19 #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 660 #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 390 #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 19 #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 390 #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 390 #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 Wallfish and K-TRON reacted to this Share this post Link to post Share on other sites
K-TRON 19 #7 Posted January 10 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 19 #8 Posted March 12 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 390 #9 Posted March 12 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
