Swapped the normal carb back onto the bike last night.
Still not going right so ordered copy pwk38
Decided to check the piston as it felt low on compression as it kicks over like a 125 (although still starts easily)
and after checking with my newly acquired cheapanese compression tester it read 115psi
(un)Fortunately I had my other mates 200 in the shed to weld the gear selector fork back on. so I checked it and mine too.
Whilst id take the absolute values with a pinch of salt, comparatively it gives an idea.
Mates Ec200, decent looking cylinder and piston, 145psi
My Ec250, had a top end done around 20hrs ago 165psi
Cylinder is in pretty bad shape.
Obviously it wouldn't help with the running of the bike, but it makes no nasty noises. Will have to see if I can get a quote to get it welded bored and plated or get a replacement cylinder somewhere.
The different coloured bit beside the crack is raised, not chipped. Could it be some piston material?