hi, got my self a dt50ccmx. project .weak comp. from the start. had a oversize rebore. new gaskets all round. comp, test struggles to make 100 psi. still no comp. any ideas , thanks b. johnson.

Drop a teaspoon of oil down the plug 'ole then rerun the compression test - if it improves then it would appear to be a ring/barrel sealing problem, if not then it points more to the head, dodgy gasket/warped head/cracked head/something of that nature.