Stealth126 54 #1 Posted April 1, 2019 Just this afternoon I was running my K241 to warm it up. I was working in the garage so I ran it at different rpms for about 40 minutes. I have a couple ounces of Seafoam in the fuel to burn a little carbon. All of a sudden it started knocking lightly or tapping. It has fresh oil in it and I have been adjusting the carb every time I run it to lean the mixture as much as possible to cut down on carbon. Can I run it like that? Any chance it works its way out? Or has something developed that I need to do something about before running it more? Share this post Link to post Share on other sites
oldredrider 2,553 #2 Posted April 1, 2019 Adjust the valves to spec. Also, check points gap (.020) which sets the timing. Do both and report back. 3 Share this post Link to post Share on other sites
Achto 28,134 #3 Posted April 1, 2019 47 minutes ago, Stealth126 said: I have been adjusting the carb every time I run it to lean the mixture as much as possible to cut down on carbon. Can I run it like that? Be careful on how lean you go. If you are too lean the engine will run hotter and you risk scoring a cylinder or even worse yet melting a hole in the piston. After making your carb adjustments run the engine for a while 15 to 20 min at full throttle, under load would be even better. Then check your spark plug, if the electrode is turning white then you are too lean. I little rich is better in my book. 4 1 Share this post Link to post Share on other sites
Stealth126 54 #4 Posted April 1, 2019 Okay. Thank you. I will take that advice. On another note, it was a false alarm on the tapping. A piece of the pto mechanism was loose and tapping against the starter. Pretty relieved. 5 Share this post Link to post Share on other sites
Stealth126 54 #5 Posted April 11, 2019 Next issue on this engine: At three quarters throttle and up, if you put it under any load or increase throttle quickly it bogs right down. I haven't had it stall, but bogs down and runs terrible. Decrease throttle to half or so and it sounds great. Seems like a new engine. I don't have any experience with what would cause that. Any ideas? Share this post Link to post Share on other sites
Stealth126 54 #6 Posted April 11, 2019 On 4/1/2019 at 2:52 PM, oldredrider said: Adjust the valves to spec. Also, check points gap (.020) which sets the timing. Do both and report back. I will also do this and let you know the results. Share this post Link to post Share on other sites
953 nut 56,645 #7 Posted April 11, 2019 7 hours ago, Stealth126 said: put it under any load or increase throttle quickly it bogs right down. On 4/1/2019 at 3:35 PM, Achto said: you are too lean Wants to be a little on the rich side to respond to changes in load. Make all the suggested adjustments and see how it runs. Share this post Link to post Share on other sites
Stealth126 54 #8 Posted April 12, 2019 Gentlemen she now purrs like a kitten. I ran a can of AMSOIL Power Foam through it and more importantly adjusted the points gap. They were set at .023. I adjusted them to a loose .019. Runs like a new engine. 2 2 Share this post Link to post Share on other sites
