The head picture is interesting!
The first time you showed a picture of this the head was still quite dirty, and going by the cast in number I picked the head as being the same as the 1500 australian spec (with air reed valve port to the exhaust) ... but looking at it now, nice and clean, it has a full circular decompression recess. Same casting number but with an additional factory machining step....
looks like your going to end up with 8 - 8.5: static compression.
You might want to check that the M12 head fasteners will fit thru the head holes... that head might need the holes enlarged.
I wonder what North American model this was fitted to?
Steve
i'm a little bit confuse about this head
hole for the ten head bolt are the good size for M12
I'm not sure but many of my spare parts are coming from somewhere but not from north america
I know the OP import parts from Italia
Wait a minute, if the ring gap is different depending upon where it is in the bore, does that not mean that your cylinder is not a true cylinder, but somewhat tapered?
Definitely from North America with the full circular decompression recess... if it's 1500, and carb, and suits M12 sized fasteners, then it's an early 1980 carb US spec X19 head...they used an odd bolt which was M12 just under the head, but narrowed down to an M10 thread.
Interesting that they made this head version in both flat (euro) and decompression (USA spec) ... seen it before on other versions, but not with this particular casting number. The one that was fitted to my 1982 complianced 1500 is date stamped 1980
Hole that needs to be plugged on spark plug side is to the right of and slightly up from the temp sender in this pic.
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