Use the search function as awhile ago this matter was discussed in depth, and I am sure it was several times before that. I found a chart which specified the optimal # of caliper pistons vs. the cyl. bore size as a spreadsheet, sourced from I think it was Vintage Brakes, I may be a bit rusty on the name, but check the prior entries on the forum.
At the time I was trying to determine how I wanted to go to upgrade my '92 front end & was considering an USD fork, complete, from a later model FZR 1000 (last yr. had 6 pots) or a YZF or R1. After looking at the choices vs. $$, I opted to stay w/a VMax front end (Horrors!!!) but used the '93+ model since I got a greal deal from a local owner who cut me a sweetheart deal on his old take-offs in fine condition. I went w/FZR 1000 4 piston opposed calipers (direct bolt-on to the '93+ VMax sliders, no adapter brackets necessary, just the 298 mm same series-'93+ VMax rotors) & since I already own an FZR 1000, I had some spare calipers around, plus, it saves on buying parts ("Gimme a dozen 'o them-there HH FA88's"). Upgraded w/Russell s.s. brake lines & after careful consideration, I went right back to a ronayersmotorsports.com-sourced o.e.m. master cyl. I wear XL or XXL gloves, so the lever reach has never been a problem for me, and I had gotten good service out of the stock masters, clutch/brake, so I stayed w/them. Cheap-enough, and good enough in function for the time in-service I have gotten from the VMax & the FZR 1000.
No, they don't have sexy remote reservoirs, adjustable levers, candy-color finishes, or anything else besides reliable function to recommend them. They are priced right, fit the bike w/no fudging of wiring, fitment, or anything else, so why not?
Some people like the FJR1300 setup, if you need a shorter reach, just make sure the 5/8" dia. is what you get, or something close to it, as that's what Yamaha engineers chose for my 4-opposed piston system.
So, do a search and read-away!
