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Afternoon Mike, Apart from the broken rings option, you also have the worn valve guides option which gives you the same effect (gases going where they shouldn't). If it was a sudden change, then broken rings is most likely. 50/65/65/65 does seem a bit low, if it's a P/P engine I think around 100 to 120 - from memory - someone posted a question on compression. Another possibility is a broken piston crown if you dropped a valve head. I would suggest that you need to at least remove the head and take a further look. Removing the pistons on the Standard petrol engine can only be done from below (I don't believe the big end will fit up through the bore) so it is an engine out/crankshaft off job. Replacing the rings is easy enough, but you will need a piston ring compressor (Halfords) to make life easier - get the rings on the right way up, though. Torque wrench will also be needed, plus normal assortment of tools, large and small hammers, stud removers, sticking plasters, and your choice of alcohol. If you are going to do all that, deglaze the bores and replace the liners if needed, reseat the valves, check your clutch for wear as it will be a good time to change it, replace the clutch thrust and pilot bearings, replace the transmission input shaft seal, replace the front and rear crankshaft seals (and any others you come across), check your main and big end bearings for wear, check crankshaft for ovality, replace oil pump if pressure was lowish, check for wear in the gudgeon pins, and generally try to ensure that you don't have to split your tractor again. This is an off the cuff, worst case listing . . . so don't get despondent . . . . it may not be that bad. Mark everything as it comes off so that all the parts go back in exactly the same places on reassembly - eg pushrods, tappets, pistons, big end and main bearing caps, position of clutch cover on flywheel, etc.
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