Right.......... Got home a bit early today and had a look see, I haven’t taken the heads or barrels off but I found out which ones has gone. I’ve been told 9 time out of 10 it’s the front/bottom piston that goes POP, I took the spark plug out ....mmmm....golden brown.. Lovely, managed to get the compression tester on and it 118psi gooooood,

Now to the top back one, took out the plug and errrrrrrr its grey, uh Oh! Found it, I couldn’t get the compression tester on it, but looks fairly obvious that it’s the back/top piston/barrel that’s gona need looking at will keep you posted on what went wrong!

Is there a chance the plating will be ok or is it fairly certain that ill need to have it done?

Found this today im sure most of you know what to look for but apex have an interesting page on there site!! Turn away if you’re mechanically squeamish

http://www.apexleisure.co.uk/pistondiagnosis.htm