That's what I thought. The 4 stroke engines are alot more complex (heavy). I might try a 26cc 4 stroke if I can find an old abandoned weed whacker donor.

Personally, I love the 2 strokes...simple has its advantages. I've stuck with a 20 to 1 mix. I'm a little to attached to my current motors to up the ratio. I'm not sure which of my motors have needle bearings, so I'm playing it safe. Besides, enough oil blows out of the exhaust to keep my chains thoroughly lubed....said half jokingly.