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04 RMZ250

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My bike is actually a 315cc now. I was out riding at the track today. I do 15-20 laps and decide to take a break. Never noticed anything while riding the bike. I get to my truck and I see all this smoke coming from under the bike near the linkage. I shut it off. No oil shows in the sight glass after several minutes. I add oil and get it to start up. It is spewing oil out of the vent hose which exits near the linkage. I shut it off. Know the bike won't start and feels like I lost compression. What do you think happened?

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To much blow by, to much oil, vent stopped up, or breather hose not pulled up high enough allowing oil to get into the tube causing it to syphin when running

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