No Start/ No Compression

[OldBogie]

And the answer is......... the exhaust valve guide came loose.

Looks like I need to look for a rear head.

Among the mechanical sins I intentionally commit is to nick the exhaust stem seal. The reason is unlike the intake the exhaust sees a lot of heat and pressure that burns and blows what little lube there is out. So I tend to feed it a little more oil.  Air cooled engines run hotter in this area than liquid cooled engines so like I said some posts back this is a fairly common problem which having a pressed in guide come loose was probably helped by a sticking valve. Once in it you might find this was initiated by piston kissing valve, so carefully check the piston for dings and the valve for bent. Also check the valve spring for meeting pressure, if you don't over rev the valve train which leads to adventures like this it still can be the result of a spring loosing tension and allowing the valve to float off the seat to where it gets hit.

So take the time to cover the contingencies.

Bogie