Need some suggestions...Have a '06 RMZ 450 that runs awesome. Recent valve check in spec and fresh oil. Starts on first kick cold/hot. Went riding today and had the engine completely die 2 times under slight acceleration on gradual hill climb. No bogging prior to stall - just felt like someone pulled the plug. Kicked right over w/ hot start and I pressed on - happened 1 more time. Any thoughts? Buddy says he's had it on his Honda CRF 450. It was a muddy ride but the stalls did not happen going through water. Anyone????