600 mxz track extension clutch and gearing suggestions

[conpro]

I have a 2014 mxz 600 carb sport. I have recently extended it from 120x.75 ripsaw to a 137x1.75. Now I need to make some adjustments with the clutching and possibly gearing so that it can make proper use of what power it has and that sweet new track. I really have no idea where to start so any suggestions, feedback or experience with this or a similar setup would be much appreciated. If anyone knows what the stock 600 sleds with 137” tracks run for gears and clutch setups that would be great too.