Yes is takes a spanner wrench, but the pipe was frozen inside the flange, i added heat from a torch and still it wouldnt budge, then i noticed where someone had cut and rewelded the pipe years ago. When the pipe was hacked off the flange backed rite out, the piston was stuck in the very top of bore solid frozen. With a few blows of a hammer the piston crown was busted and the sawz all could get in and make 4 slices on the piston, then the long barrel air hammer could do its thing, off came the round barrell 250 jug off the 125s motor. Brady said these are called " Bull-Dogs " .
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un-retired racer, bike unknown, race preferrence unknown.