This is where I am at the moment....
I am ordering a 60mm Mazzi crank.
How do you see this - education please.
I am going to add two ports to the cylinder per the post above. Then I am going to match the case to the new ports and epoxy up the unused porting.
I want to use that pipe . With the additional ports and some jetting I am hoping to make it a reliable runner with a little more than the stock P200.
apologies for the late reply...
60 crank is bueno.
head has been reprofiled or skimmed due to the lack of ridge on the mating lip, the pattern on the surface and that it has less of a "jockey cap" look. appears to be a good job, especially for an early 210 set up.
personally, I wouldn't epoxy up anything as long as all of your sealing surfaces, like, sealed. there's really not much of a benefit tbh and the risk of that coming apart negates any benefit you may get.
it looks like somebody had at it on that stock piston a little. photos might be misleading, so without having it in my hands or accurate measurements I can't really say. but that barrel looks untouched. with that head, it may come correct, but with the new crank, you're gonna be doing some measuring. so keep that in mind that you're probably not plug and play.
it sounds like you wanna do an O-tune. so anything you can do to make it breathe better would be great, especially with that pipe. but really a GS piston and getting after with the Dremel would make it sing. otherwise it's gonna be a chore to ride and the pick would be a big box.
however, you could just snap on a malossi and roll. sell that top end and crank for a hundy to offset the cost and you'd be in high cotton coming and going. pipe would match too. or if you want something more mellow adios the pipe so you can add that to the offset and grab something more mellow.
it really comes down to expectations and riding style.