YM1600 no power

[series_9]

My YM1600 ran great for a few hours yesterday, but today it has no power and it has a rough sound on it. It didn't overheat and I already went through the fuel system. There's no water in the fuel. Any ideas on what might be causing this?

 

[ottowerks]

Double check the air filter and spark plugs. Sometimes a clogged filter or fouled plug can cause those symptoms. also, make sure the carburetor isnt gummed up or the ignition timing hasn’t shifted

 

[avocadoman]

Its also worth checking the injectors and glow plugs, a faulty injector can cause rough running and power loss. A compression test could help narrow it down.

 

[Countryboy]

I know the others don't want to say it, so I will. Could be a compression problem, so doing a compression test could be a wise step. I know this usually means an engine teardown, so maybe check the other stuff and if it's not one of those consider this.