jsp_333 222 #1 Posted July 30, 2014 From my limited knowledge of the RJ I bought last week I know the engine is either Kohler K-90 or Clinton 1200. But which one is mine? I've uploaded some pics but is there an identifier stamped anywhere on the engine? Also, how do I determine whether to start looking for parts or just start looking for a whole new engine - either Kohler or Clinton? John 2 Share this post Link to post Share on other sites
AMC RULES 36,941 #2 Posted July 30, 2014 (edited) The curved fins on the head suggests to me it's a Kohler K-90. Edited July 30, 2014 by AMC RULES Share this post Link to post Share on other sites
Jake Kuhn 1,547 #3 Posted July 30, 2014 That would be a kohler k90. The 90's had the curved fins, but the 91's had straight fins. Share this post Link to post Share on other sites
stevasaurus 22,229 #4 Posted July 30, 2014 (edited) That has the original, sought after muffler on it also. Pull the plug, if the pulley turns freely...this could be a good engine. You can look down the plug hole and see if the piston moves up and down. You can look in the carb hole and see if the valves move like they should. Drain the oil...that can tell you a few things. If all that looks good, she will probably start if you have the carb. The above is the place to start. Do a search for "K90" in this section...lots of good reading. Edited July 30, 2014 by stevasaurus Share this post Link to post Share on other sites
jsp_333 222 #5 Posted July 30, 2014 Awesome, thanks guys. The pulley turns freely with the plug in it but there is nothing like actually seeing the piston and valves moving up and down. Oil is the great unknown at this point as I had trouble getting the steering wheel / hood off it to easily pull out engine. Ya I've got the original carb and oil filled air filter. Jake, noticed you've got a couple of "stamped frame" RJ35s What does that mean, and what the significance? I lifted mine up the other day and believe I saw 4 numbers stamped on the underside of the frame. John 2 Share this post Link to post Share on other sites
Jake Kuhn 1,547 #6 Posted July 30, 2014 Awesome, thanks guys. The pulley turns freely with the plug in it but there is nothing like actually seeing the piston and valves moving up and down. Oil is the great unknown at this point as I had trouble getting the steering wheel / hood off it to easily pull out engine. Ya I've got the original carb and oil filled air filter. Jake, noticed you've got a couple of "stamped frame" RJ35s What does that mean, and what the significance? I lifted mine up the other day and believe I saw 4 numbers stamped on the underside of the frame. John John, The stamped frame 35's are not really any more valuable or collectible than the other 35's, but there are less out there. They were made in late 55 and early 56. The only real difference is that the frames were made out a piece of stamped steel rather than the channel iron like yours has. The numbers you saw on the bottom of your frame are probably just from the steel supplier, my 57 has some writing or numbers on the bottom too I believe. Here's a pic of one of the stamped frame tractors...its not complete in this picture, but it shows you the frame. Share this post Link to post Share on other sites
specialwheelhorse 174 #7 Posted August 26, 2014 You guys better get your act together, Clinton's have curved fins And k90s have angled fins k91s have fins straight across. Share this post Link to post Share on other sites
CasualObserver 3,406 #8 Posted August 26, 2014 The K-90 head fins can be angled or curved. The engine pictured is a Kohler. 1 Share this post Link to post Share on other sites
jsp_333 222 #9 Posted August 27, 2014 Now how about thoughts on what's inside. Pulled the head off on the weekend. Pictured is what I found inside. Worth saving? or too badly damaged Also drained the oil - was pleasantly surprised to find at least 1/2 quart. john Share this post Link to post Share on other sites
