Quote:
Originally Posted by svandamme
Nice 1st post on the forum..
but i don't think anybody here was saying it was a 2 stroke anyway.
And as far as bottom end vacuum leaks, i don't think there really is such a thing.. a vacuum leak is a vacuum leak.. a crank case technically should(doesn't have to be) not be vacuum ..
The only reason it typically would be vacuum, is for enviromental reasons, because those require the crankcase breather to vent into the intake..
and it typically does that through the vacuum plumbing.. And that's what causes the crankcase to have vacuum..
Any air escaping in the crank when it should not, will affect the vacuum system.
Which might cause unmetered air to go into the intake, and cause a lean running condition..
That has nothing to do with 2 stroke at all..
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Oops, blew the rule on my first post! Semi-random picture below!
With 2-strokes the air/fuel/oil mix travel through the crankcase. If you get a leak in the crankcase (bad crank seals are a common culprit) it will lean out the mixture and then you can melt down a piston. I believe this is why sammyg2 made the comment: "Lemme guess, had a bottom end vacuum leak that caused it to run lean?" The valve reliefs in the surviving piston shows it's no 2-stroke, however.
