What do you need to know?
CB750 pistons into 500/550?
You need access to a lathe to turn the tops slightly to fit into combustion chamber, dont remember the exact angle but its easy to find when you have it apart. I usually turn about 1 degree less to give a more even 'squish' Did over 70,000 on my bike without any problems (other than piston ring wear, but that was due to the 13,500 rpm 'limit') Dont have any info on the others I've done (so they must be working OK, you can bet I'd know it they F***** up)) You can fit CB500 pistons and liners into CB400F (never tried it on CB350F but seems possible) thats quite a lot more involved though. '400' will wheelie straight off the throttle without massive rpm and severe clutch abuse
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Modded 550 will do about 125 with hard bags and tank bag,(and a piper cam, 4 into 1 ex, bit of porting) but hanldes like #$%* at 115~120, (ok when you get above this speed) obviously more with low bars.
The Wiseco piston came like this stock, it may be a bit radical for road use but you can get them with lower compression. It shows how a 750 piston would be modified for use in a 550 though (and gives a natural lower comp ratio) 500 pistons dont need modifying for 400 as they are flat top.
The holding fixture fits into lathe with a long draw bolt through headstock. It means you can do several pistons without holding them directly in chuck and you dont need to spend a lot of time centring things up (uses a 'u' nut, the piston pin, with some all thread and a spacer/washer. cant find them offhand) Thats not a very good picture so I'll try again.
PJ
