Yes, I did a search but came up blank using my keywords..... History: 2000 yz426 rebuilt last summer with fresh jug, new piston/rings (Wiseco 12.5:1), 450 cam, complete bottom end overhaul and head inspected, cleaned and new stem seals. I've probably got 50-60 hrs on the rebuild and have used Rotella-T synth since the rebuild. Have not had any issues until yesterday. I went woods riding with elevation of approx. 1k feet and temp was 80f. I warmed her up and took off for some light trail duty. After 10 minutes I began hitting some very steep, technical trails and ended up on the ground numerous times with the bike inverted. On one particular crash it took a few kicks with the hot start plunger and I noticed quite a bit white smoke coming from the vent tube every time I'd kick and the smoke did not go away completely after it fired up. I started watching the tube as I headed back to camp and it was constantly blowing this smoke and would increase in amount as I increased throttle. Every time I'd stop and restart it would pump out smoke every kick until it fired and then it would mellow down to a trickle at idle and get more obvious at higher RPM's. Also, I notice quite a bit more oil seepage from the breather tube than ever before... probably 3-4 times as much. Two things come to mind that may be contributing factors: I rode through some deep water last time out that probably was above the vent tube and I have not rerouted it or added a one way valve. And this was my first time out with a Scotts stainless oil filter. Could the water or the Scotts filter have any impact on what's happening here or just coincidence? I cant believe valve stem seals would go bad this quickly. Any idears? Thanks.