i have 2nd time the lower cylinder seized last week, oil system works fine, i will then asume my large 150 main jet can cause the detonation, due to low oil mixing.
can this be the case can detonate with extremely large main jets?
you need to measure the squish and tell us ,
what fuel are you using ?
Have you skimmed the heads ? What is the volume ?
Have you advanced the timing ?
Show us some pictures .
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