the reason I asked is because I just bought a 300 u this fall and am not very familiar with it.
From my perspective, there are a number of related things involved here.
I changed the engine oil a few weeks ago because I didn't know when it had been changed before, and I thought it would be good to make sure it had as light an oil as possible in it for cold weather starting.
I had posted a question here about 10w 30 oil.
It had always started fine when the weather was mild but sure enough it wouldn't start when it turned cold.... battery wouldn't crank it very long.
I also posted about it seeming that it did not fire until AFTER I quit cranking.
At one point I posted about the 12 v conversion that had been done to it.
Then I thought about the oil in the air filter... I had no idea what that was like... I thought, "well maybe it's thick and can't suck air through it properly", so I changed it also...
It had some ice frozen in the bottom... the oil was pretty thick and had a fair amount of gook and large particles in it.
Turned out, I bought a battery and several questions were answered all at once... the engine turned over well... It fired during the cranking... and it started up.
but I still didn't know about the air being drawn through the oil.
The oil is all below the filter.. there is a cup shaped thing welded into the bottom of the oil cup but it doesn't seem to be made to draw the air through the oil... it does seem like it might be shaped to cause the oil to be pulled and splashed out of the cup, by the air, and sort of thrown about amongst the air. sort of similar to a "lawn sprinkler" of oil..... and there is a little hole in the cup shaped thing to allow it to fill back up with oil but certainly not enough to draw any useful quantity of air through it.
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