I just bought a USED OS LA 15 on E bay from Bob for my Pathfinder Twin project along with the parts to convert it to control line; aluminum back plate, gasket, front venturi, valve assy. and socket head screw set. Dismantling it I discovered sludge inside the engine leaving me to believe the engine had been under water. It all cleaned up well except there was corrosion on the wrist pin. Bob said this wasn't good and sent me free of charge a replacement pin and rod. I requested to buy the parts, after all I bought a used item "buyer beware" but not with Bob Brooks. He takes credit card or PayPal Easy Peasy.
BTW the 15 runs great.
Steve