This motor is becoming frustrating. The bike smokes real bad because the dry sump is filling with to much oil then it goes up the vent and into the carb intake thus causing exreme smoking. It does it cold and hot. If I drain the lower sump, the bike will run perfect for about 5 min. I have checked all of the basics and this doesn;t seem right for a low hour 350. The oil is clean and all components inside motor look good. What are the chances of a bad return oil pump? I took the line off and plenty of oil is coming out returning to the upper sump. Has anyone ever heard of this ? I searched the internet and seen this is a common problem with the DR350 but have not seen the fix.