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Thoughts on what would cause a headgasket to fail like this?
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<blockquote data-quote="BrounHownd" data-source="post: 484107" data-attributes="member: 30222"><p>Motor died on a recent trip--lost power quickly from cruise speed then stopped and wouldn't restart. Got it to run for a bit with some with throttle on muffs in the driveway, and noticed exhaust out of the tell tale. Did a compression test and top hole (2 cylinder 2 stroke) was down to 30psi. Pulled the head and found this. Compression was lower but reasonable for a 40 year old motor (in the low 100s on both holes) when I bought it earlier this year.</p><p></p><p>No real signs the motor has been overheated, but thinking I should have the head machined anyway? What would have lead to burn-through in that one spot? It's the bottom of the top cylinder. Have new gaskets on the way for the head and the coolant cover. Want to fix it completely while I'm in here.</p><p></p><p>Thanks for any thoughts in advance.</p><p></p><p><img src="https://i.ibb.co/W6crpg6/PXL-20210718-144217061.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="BrounHownd, post: 484107, member: 30222"] Motor died on a recent trip--lost power quickly from cruise speed then stopped and wouldn't restart. Got it to run for a bit with some with throttle on muffs in the driveway, and noticed exhaust out of the tell tale. Did a compression test and top hole (2 cylinder 2 stroke) was down to 30psi. Pulled the head and found this. Compression was lower but reasonable for a 40 year old motor (in the low 100s on both holes) when I bought it earlier this year. No real signs the motor has been overheated, but thinking I should have the head machined anyway? What would have lead to burn-through in that one spot? It's the bottom of the top cylinder. Have new gaskets on the way for the head and the coolant cover. Want to fix it completely while I'm in here. Thanks for any thoughts in advance. [img]https://i.ibb.co/W6crpg6/PXL-20210718-144217061.jpg[/img] [/QUOTE]
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Thoughts on what would cause a headgasket to fail like this?
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