Thanks chaps, I'll investigate further over the weekend, and try to check the ring gaps.
Out of interest, does a low PSI number on a compression tester usually indicate a top-end problem, or could it still be possible that I've got a blown seal?
Piston direction?
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Nerdy Norm
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Lambretta LI125 Series 2, Lambretta LI150 Series 3, Lambretta J100 Cento, LML Star 150 2T