That's got to be a pretty small groomer to pull it with that. First you need to gear it as low as possible. They came with 19/39 so the top gear is about as small as you want to go but I would put the biggest lower sprocket in that would fit. The reverse may limit your choices. I would think a yellow/green spring with 48 gr. weights in the primary and a yellow spring with a 49 helix in the driven. It really depends on how hard the groomer pulls. They came with softer springs but I think you would go hard on belts getting it started.
