I have some black smoke coming on exhaust on start up, after that is normal. What cause the black smoke on start up? What should I do to prevent this?
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Sounds like gas washing oil off cylinder walls when engine is shut off? Not sure if that would be float valve bad or float level set too high. Assume dual carbs? Make sure your oil doesn't smell like gas or is reading too high (other issues there).
Find the oil dipstick, just to the right of the bottom fan belt pulley, remove it and check the small marks on the bottom to see it looks overfilled (level is above the top mark).
Then, smell it. if it smells of gasoline, rather than just oil, you have gas in the oil.
Yes - in warm weather it shouldn't take but a single pump. At 300 miles the rings aren't even seated yet. I suspect newness is more the cause. I would not worry about it. Do check oil though and change it before 1k miles - even adjust valves then on a new engine.