After some coaxing from Throttle Junkie35 (and probably annoying the p*** out of him with questions) and studying the pictures in this thread --
http://www.totallyamaha.net/forums/showthread.php?89856-EX-570-PHAZER-hydrolic-brakes-coversion-90-complete--, I put Polaris hydraulic brakes on this thing. Its a tight fit using the Poo master cylinder as either the brake light switch or the brake line on the caliper comes out right up against the side of the gas tank. Shawn advised me to use an Arctic Cat Wilwood master cylinder because the brake light switch is up on the bars like a Yamaha, but being my stubborn self and wanting to get rid of some of the wiring on the bars, I made it work. MAN-O-MAN WHAT AN IMPROVEMENT! I havent had a chance to ride it and get a feel for the brakes yet but they stop the track dead on the stand! Shawn keeps telling me to be carefull the fist time I ride it or I might go over the bars and now I see why!
Polaris master with Parking brake. You also lose the headlight switch in this conversion which Shawn remedied by making the factory switch work, I opted to go with a Pigolaris switch for the simplicity of it.
1/4" Aluminum bracket necessary to install the caliper. I used 5/16 grade 8 hardware with nylock nuts for the pad pins. The same as Yamaha Nutz (thanks for posting up on this!) in the thread above and 3/8 - 16 flanged bolts to mount the caliper to the chaincase.
Mocked up on a spare case. One caliper mounting bolt uses an original hole in both the caliper and the mount on the case. I used a washer with a whiz-lock on this side. For the other mounting bolt, I had to TIG a hole in the mounting face of the caliper shut and drill/tap for the bolt. I helicoiled the threads so they wont strip out. Ever.
Mounted in the sled showing the brake light switch hooked up.
To gain the clearance needed to get the brake line installed without contacting the gas tank, I warmed the tank, full of gas, up with a heat gun and used a screwdriver handle to create an indent and flatten the seam out. I also used a 3/16 to 1/4" adapter (Polaris line is 1/4", caliper is 3/16" WTF?!) instead of the factory Polaris cobble job of fittings.
And to make the final connection, I straightened out some of the bends in the Polaris line and used a 1/4" by 10" long extension with an inverted flare union to reach the caliper. No leaks and the brake lever is nice and firm.