which pulley the 65mm or the 61mm?

I'm suspecting the 61.....I think you need some cooling system mods for this baby - or keep her under 5000rpm...ouch!
the 61 should generate about 212F ex the SC on a 68F day.....smoke'n!
Having said that, the 65mm would do 200F.
Stock is 175F

SC water pump might have been on its way out anyway.

Motors are expensive...tinkering is fun...and dangerous....research....