By adding the 28's you change the over all gear ratio plus there much heaver then stock. By addng stiffer tranny springs you can help your brute run higher RPms and lower speeds. This will help with the boggin problem. And also give you better backshift.
For those 28 589's i would run a EPI Maroon primary and EPI Almond secondary. That will make a nice improvement in your low speed RPMs but still have nice topend.
I read in another post that you are wanting to get some big Silver Backs. If thats the case the EPI almond will not be strong enough. You'll need a stronger secondary for those.
Was it boggin like, it was havin trouble turnin the tires, or boggin like, cutting out, b/c if you were in water like that and you dont have some di-electric grease on, well everything under the seat & the sparkplug boots, then it will cut out b/c of the water.
But I agree w/ adding atleast a better secondary spring, to help get back some bottom end you lost w/ those heavier tires.
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