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Old 06-27-2006, 10:22 AM
Tech Master
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Join Date: Nov 2003
Location: lima-peru
Posts: 1,807

Originally Posted by ziggy12345
The OS is not a true ABC PL set and will loose the pinch very quickly if overheated. Go for the 12-3

What do you mean it's not "True ABC" ?? The Specs for the engine says so:

-Natural aluminum construction Nine fin blue aluminum cooling head
-Two-piece turbo cylinder head with 29mm innner and 49mm outer head
that adds extra area for more efficient cooling
-Slide Carb 11H - 3 needle slide valve carburetor with ROAR/IFMAR legal 5.5mm carb restrictor
-Rear Exhaust
-ABC construction, Aluminum piston and Brass liner that is Chrome plated
-High tensile A7075 "knife edge" aluminum connecting rod double bushed for friction-free operation.

Donít confuse compression with pinch, Sleeve Pinch is not that important contrary to popular belief. The question is how well does it seal as soon as the piston starts to close the exhaust port and if it holds compression after you roll it to top dead center.
Place a few drops of after run oil trough the top (removing plug), then place plug in place, then roll piston to top dead center and listen and look for air bubbles through exhaust port. If thereís none, then your engine still has compression, even if it has no pinch.
The fastest team motors we have, have zero pinch.

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