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After comparing a lot of different part numbers, I've finally figured out the correct engine type, which is Type 13B340. The induction housing assembly was the part that changed, 13B340 used the older type A-13-18 that was used in most engines from the approx 1965 onwards. And 13B406 uses the newer type 400563 which has two extra screw holes, to directly fix the feather valve assembly to it. Take note of the different spacer used under the cylinder too, these are original. Scan of parts list/diagram to follow... David

Thanks for that picture, the O&R branding should date the engine to Nov/Dec 1974 or earlier. There are two possibilities for the Chicken Power engine, with the threaded exhaust manifold, remote mounted fuel/gas tank and a silver painted /starter blower housing with toggle switch (the numbers in brackets are the release date from the O&R list); Type 13B-340 (7-1-74), this had a flexible exhaust pipe. Type 13B-406, this has a tube exhaust pipe. I'll have a closer look at the part number differences another day (the carb parts differ between the above two engine types). Other engines that it can't be are; Type 13A-181, older style engine with round starter mech. Type 13B-328 (8-29-73), has five cup exhaust muffler. Type 13B-341 (1-21-74), has five cup exhaust muffler, but could also be supplied with threaded adaptor. David