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Old 04-04-2010, 08:41 AM
Creative Engineering Creative Engineering is offline
Join Date: Sep 2008
Location: Clearwater, FL
Posts: 1,668
Default re: 60 MPH...achieveable? Who cares?!? Let blueprint an engine!

Originally Posted by Easy Rider View Post
Jim, Back when I use to rebuild my high reving BZMs. I use to remove the seals on the crank bearings. I found out that when I left them on the bearings my crank bearings would not get enough lubrication and evenually blow up from the heat. I'm not sure but doesn't the HT motors have crank seals that fit into the cases?
Yes, the seals press into the case on each side of the crank. I had wondered the same thing...I was thinking that even if the bearings were positively sealed, would there be enough volume for the mix to adequately cool and lube the bearings. Your post confirms that thought.

Over the years I've rebuilt quite a few 2-strokes, and as far as I can remember they've always had separate bearings and seals.