ET160 30 #1 Posted May 27, 2019 I was thinking of taking a compression reading on my B80. What should the reading be for a K181S? Share this post Link to post Share on other sites
stevasaurus 23,281 #2 Posted May 27, 2019 I don't know if you can get a good reading on the "K" series Kohlers. They have a gift called ACR or Automatic compression release. It keeps the exhaust valve open slightly while cranking the engine or when pulling the rope. Makes cranking or pulling easier. Once the engine is going the ACR lets the valve close all the way. Here are a few pictures of the mechanism on the cam shaft. This is "K" 181. The screwdriver is resting on what would hold the valve partieally open. Share this post Link to post Share on other sites
ebinmaine 72,739 #3 Posted May 27, 2019 Ya can't use a compression test. Do a Google search for leakdown tester That'll tell you. 1 Share this post Link to post Share on other sites
ET160 30 #4 Posted May 27, 2019 Interesting.... Thanks. Share this post Link to post Share on other sites
