If its the PZ19 carb, the main is a 75. its not marked. I would start with an 85. I have installed a bunch of these carbs, and I have never gone above 82. they take standard keihin jets

5x7mm

http://www.jetsrus.com/a_jets_by_carburetor_type/jets_keihin_99101-116_main_round_small_and_38-xxx.htm

you can unscrew the fuel valve to pull the carb, but I would replace those crummy 3x10mm screws with 3x12mm and no washers.  the 10mm stock screws are too short, they strip


or just pulling off the tiny lock washer on the stock screws helps



Last Edited By: ctbale Feb 8 13 10:10 AM. Edited 2 times.