In Snydal's excellent Bullet manual under Performance Upgrades he mentions that the Fury with much more power ran the standard Bullet bushing big end but wasn't considered famously unreliable. I think that in the same vein the Himalayan big bore kit would be fine if driven sensibly. As for the proposed 850 kit for the Interceptor, a near 30% displacement change looks like a wait and see proposition. The well balanced 650 Interceptor already makes near 50 BHP. I believe if I wanted an asphalt shredder there are plenty of reasonably priced used ZX12's, Hayabusas, etc. with pucker marks on their seats available. Speeds over the ton are best reserved for controlled venues, like the race track. The street is way too random for 170 MPH escapades.