6wheeler 675 #1 Posted 7 hours ago Hi all. I am working on my C-165. If the weather ever makes up its mind, I am trying to get the tilling tractor up and running. Here is my situation. My K341 is back firing out the exhaust and running very poorly. So far? Here is what I have done. First, I did a compression test, 123 psi, good. Next, put on a rebuilt carburetor with a new electric fuel pump. Next, file and set the points. Take it all apart and set the valves. I put it all back together and no change. I ordered points and a condenser to replace next. This is the same engine that swallowed the brass screws from the choke plate I posted a while ago. I pulled the head at that time and found no damage. I lapped the valves at that time and they both looked good. I just lapped them because I had it apart. I am stumped. What am I missing? TIA Pat Share this post Link to post Share on other sites
Bill D 2,665 #2 Posted 7 hours ago A bad condenser will cause backfiring. After you change points and condenser time it with a timing light. 2 Share this post Link to post Share on other sites
953 nut 64,490 #3 Posted 6 hours ago 37 minutes ago, Bill D said: time it with a timing light. The instructions for timing your engine are in the Kohler service manual. Share this post Link to post Share on other sites
wallfish 19,456 #4 Posted 5 hours ago Flooding, is fuel spitting out the front of the carb? Start it and disconnect the power for the electric pump so it's not feeding fuel. Take notice if it runs better before the carb bowl empties. Clogged muffler maybe? Try running it without one (but not for too long) or a different one on there. Share this post Link to post Share on other sites
Ed Kennell 45,210 #5 Posted 4 hours ago 1 hour ago, wallfish said: Clogged muffler maybe? The one that is usually forgotten. Share this post Link to post Share on other sites
oliver2-44 11,286 #6 Posted 4 hours ago 3 hours ago, 6wheeler said: . First, I did a compression test, 123 psi, good. Those engine have a compression release so you cant get a good compression reading. I've gotten 45-60 psi just verifying the compression release is working. The 123psi does not seem possible unless the compression release is not working. Share this post Link to post Share on other sites
kpinnc 17,436 #7 Posted 3 hours ago 57 minutes ago, oliver2-44 said: The 123psi does not seem possible unless the compression release is not working. Or if you crank it backwards? No clue if that works or not... Just guessing. Share this post Link to post Share on other sites
