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You gave it your best shot. Good luck on the next project!

Know anyone who has a borescope? Harbor Freight has the least expensive ones. Do a visual on the inside of all accessible ports.

When you do the compression test, is it done on a hot engine? A hot running engine, if suffering from a crack, will most probly start acting up as soon as the engine gets hot.

That thar conundrum is shore nuff a tail twister! I mildly suspected an intermittent ground out, if that’s possible. I ran into some problems with my diesel Farm Pro (aka Jinma) tractor. It was running fine then it started sputtering then it died. It wouldn’t restart fer nuthin’. Took off the...

You reworked the key start? Is the part new, used, NOS or the original part, just rewired?

Good luck!

I wonder if this would work:

Do you have a part number or description of the adapter?

You probably have this one as well. One problem I ran across, can’t remember what engine, where is was a crack in the metal inside the piston wall. You may have already covered this but run a compression check, if that’s even possible, and see if you are losing enough compression to fubar the...

https://itstillruns.com/troubleshoot-yanmar-diesel-injection-pump-6009204.html

Thank you for that info. I don’t normally tinker with the small engines anymore. Good info to know!

I was unaware that ethanol added a coating to everything in the fuel system. Good info for troubleshooting any gasoline type engine. Now that you mention it, I remembered a warning I was given when I got my first multifuel, never leave it in gear. A slight push can start you up and off it’ll go...

This is the link for the Manual for the engine. Hope it helps. https://www.nuvair.com/manuals/Yanmar-LV-100-Use-Manual.pdf#page101

I found this link on the web. There’s several ideas for troubleshooting your problem. My thought on this concerns your chain of events. Engine was starting, running and shutting down normally. You performed routine maintenance on the engine and the best you can get is a very low rpm. Low fuel...

I’m going through this in my head. I’ve been working fuel problems as well a bunch of issues that are normal in a 50 +/- year old truck. They also apply to small engines. Fuel; sounds like you have that covered.Good clean tank and fresh gas, check Replaced filter(s), check Valves; checked (I...

I just saw your post and added my reply. Have you heard the engine 101 lecture? I’m getting pretty good at it. I no longer torque off all my listeners. I just torque off most of them 🤪

Change your fuel filter. Also check your fuel tank for debris.