Since I replaced a set up pulleys with gears and chain that were part of a very low ratio for good torque up hill climbing, I no longer have that smallest 1.7 inch diameter pulley slipping.
I just got a large 28 tooth gear I ordered and intend to use it with an 18 tooth or a 13 tooth gear. This will get me back my low ratios of around 20:1 and 30:1 ratio.
Temporarily I only have two 18 tooth gears in place so that with two other belts and twin jackshafts gets 14:1 ratio.
I would really like to see it climb without needing as much run up speed when trail riding.
The smooth trail with slight grade in the photo is not the majority of what there is there to ride. I'll be back with better torque and using the sweet spot of the 3hp Briggs 4 stroke's power band next time out.
(the rough stuff trail riding)