Removed from my Briggs and Stratton 12.5 hp single cylinder engine which came out of my Countax K36. 99 Teeth on the ring gear. Make sure yours is the same as in the photos.
The last picture of the engine cover is not included but is for the purposes of the engine code and date code plates only. If you require more info please do hesitate to contact me. Flywheel pictures will be added in about an hour.