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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 13581
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Engine would not start--no compression. I removed head and

Customer Question

Engine would not start--no compression. I removed head and found that head was not torqued down properly-not torqued down on one side. Got gasket sets and cleaned it all up and noticed that the exhaust valve only seated on one side-the other side I could see light through.How could an engine even run like that? what caused this problem???.
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: Yes!
JA: Do you plan on doing the work yourself?
Customer: Depends what we are talking about.
JA: Anything else we should know to help you best?
Customer: Not really! I've never seen a valve do this!!!It is not burnt either and the vale seat is fine also.. Can't understand how this could be.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Small Engine Technician about your situation and then connect you two.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Curtis B. replied 1 year ago.

Valve is bent form hitting piston, valve likley stuck and hit piston!

Customer: replied 1 year ago.
If you turn the valve on it's seat, it still shows light through on only the one side. That rules out a bent valve!!
Expert:  Curtis B. replied 1 year ago.

So you say valve seat is loose? Seat may be loose in the head, Can't tell without removing the valve.

Customer: replied 1 year ago.
No. Seat is not loose! If the valve were bent, when you rotate the valve on it's seat, the gap would turn! It doesn't!!!
Expert:  Curtis B. replied 1 year ago.

Good luck with it, you know more than I. I will opt out. Maybe I need more experience!

Customer: replied 1 year ago.
Initially, one might think the valve is bent, but I then removed the valve to in spect the valve itself and the seat--not burnt or anyway damaged---strange to me!!!
Expert:  Curtis B. replied 1 year ago.


Expert:  technicaldan replied 1 year ago.

Hi, I would consider checking the valve guides, if you can see light and the valve is straight, then it seems the valve seat may of turned oval.