craftsman mod.#2900 what hp is it?

just bought a craftsman riding mower mod.#2900, 30" cut 6 forward speeds. There is no information about the engine at all. There is a decal on the engine housing says MTD....420cc Would that be about 12hp? You cannot cut in reverse.If you put it in reverse with blade engaged, it kills the engine.(kill switch located by shift lever) Not anything about carb adjustment. I guess I'm just use to briggs & Stratton engines. If anyone knows about this engine I would appreciate you sharing it with me.



bobmack