I'm leaning towards the Homelite 26cc because they're only $69 in a weedwacker at Home Depot. I will be removing everything I can from the engine just like a plane, with electronic ignition, etc. The generator will also funtion as a starter.

Is there a major difference between the newer 26cc engines, and the 25cc Homelites? Can I buy things like cylinder jugs, rings, bearings, etc for the motor?

I'll probably try and increase the compression ratio and run E85 for a better power to weight ratio.