Little work on KTM SX 300 with Flettners TPI type. The owner only request to replace the piston, but we could not miss this opportunity.
Only minor corrections, squish from original 1.7 mm to 1 mm, slightly radiused piston, corrected and reshaped combustion chamber to restore compression. We didn't tell the owner anything about it, just wanted to use him as a “live dyno”. Later he called in doubt is it really his engine. At the bottom its like a 450 four stroke with two stroke top end.
It looks like with more changes on this engine, could be very interesting results. Very nice back flow restriction space, between crank and reed room floor.
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