Head gasket husqvarna 245R need or not. See photos

[Burnerman]

Puzzled!
The damage to the new piston will be caused by the breaking up of the old big end bearing.......sending rubbish up the transfer ports in two stroke fashion.
John

 

[lostinthelight]

I haven't check with any tool but looked fine. Also the original crankshaft plastic seat are still there even if in bad condition.

If its s one piece cylinder with no separate head the only way I know of is to poke some soft solder wire through the plug hole, bring piston to TDC which compresses the solder which you then measure.

 

[Burnerman]

Still puzzled......wondering if the bearing was about to break up anyway - do we have any history?
John

 

[Burnerman]

Just for interest, and nothing to do with this machine...
I have had two stroke crankshafts rebuilt professionally for me in the past. Each required a new connecting rod.
One came back without an oil slot cut in the bottom of the rod, so oil could get into the rollers. It seized up in seconds.
I have to conclude that this engines demise was due to lubrication issues, especially as a new piston was needed?
John