Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, Bob my name is ***** ***** I will be assisting you.
Can you do a compression check and let me know what the compression is? Can you do a cylinder leak down test on the engine? This could be as simple as a blown head gasket.
It does sound like you have a compression problem, these numbers are low for what it should have. I would suggest removing the cylinder head and take a look at the head gasket, I believe that you most likely have a blown gasket this happens often on these engines. It's not like the older engines, you won't hear that hissing sound when the gasket blows, they tend to blow between the oil drain back passage and the cylinder not externally. If you had a cylinder leak down tester you could perform a leak down test and be more positive about where your problem is but since you don't have one I would check the head gasket.