900 pistons in a 750?

I read a thread over 6 mos ago by one of our Au/Nz friends stating he had an xj750 police and it took 900 pistons. Can the xj750rh be bored and plated to accept the 67 mm (1983) 900 pistons? Are the pin heights the same? Are the rods shorter? Where will my compression ratio wind up?

 

Assuming the compression is 9.2, with the bigger piston bore all other things being the same you will have 11 to 1 compression. Hello race gas

 

You can put the 900 crank, pistons, rods, block and heads on a Turbo 650 with minor modifications, so why not??

But if you don't use the crank, you end up with just (roughly) 800 CC, so why bother??

The compression can be "fixed", but if you had access to a Seca 900 engine, why not put the whole thing in??

 

Well, I've been looking at new motorcycles, and the guy asked me what's wrong with mine and why do I want to replace it? Nothing I answered, I really like it but it's just getting old. (but it could use a little help on the low to mid range, two up) The last time I checked, I couldn't find any pistons to do a basic rebuild, but yesterday one of my sorces re stocked and they have new 900 pistons for about $400 a set, nearly identical to 750 in cost, in fact nearly 25% less than 1mm over 750s. So if if I rebuild it anyway, I wondered if I could use 900 pistons for the same price as 750s, mainly to bump up the compression ratio within reason and with the same size carbs (or 33mm kenny pumpers) bump up the low end air flow, get better throttle response and more torque & horsepower without increasing the piston speed in just one lick while using a stock cam. All else being equal that is. It runs fine on 87 octane now, in fact better than on 91. It comes out to 795cc's but the 83 & 84 900's were only 850's anyway, and its the easiest least expensive way to more tug without losing any top end.
The 900s stroke pretty much needs a cush hub to keep the front wheel on the ground and the gears are different too (taller) both a step in the wrong direction for me, it also has a narrower rear wheel because of the hub and the rear caliper. It seems there's more reasons not to do it that way. But the question was will it work and how much does it alter my compression ratio? I believe the engine will last longer with a 750 crank than a 900 and I'd kinda like to get another 10 years or so out of it, or untill I get too feeble to ride it any more. If they made a shaft drive, 90 hp inline 4 cylinder naked cruiser that runs 12s or better in the 1/4 mile and weighs 500 pounds I might buy it. Till then I'll keep what I have, oops that's almost what I have now anyway.
Thank you for your input, I already thought about what you asked me first and decided not to do it that way. I saw a 650 turbo on craigs list the other day for $1500 but I don't trust turbo motors.

 

Another fuel alternative is avgas, 100LL which is currently $4.49/gal at the little airpark near my house. Keeps the pinging gremlins at bay, alcohol is eliminated, and won't destroy a fiberglas (Penton) tank.