just found to my cost that they are very different between mc16-18. after being smug in the certain knowledge that all nsr engines are the same as they all start with mc16, i tried to put an mc16 engine into an mc18 which i stole from a guy who had blown it up, tried to put the whole motor in. no mounts were wrong, top mount too wide and no rubber mounts, not a problem just use the complete top end save on gaskets pop the whole lot on, sorted, come to put the water pipes on, bugger wrong angle and size so had to change the heads so in the end the barrels were the only thing i could use, expensive mistake eh i should RTFM in future
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"cant you see the no smoking sign, this is a public space" rrrrrrriiiiinnnnngggggg ddddddiiiiinnnnnnggggggg 2 stroke till i die