Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I have a Tecumseh HS-50 engine on my minibike  The hp is 5.5 I think.  The engine specs are hs50-67124C  and the Serial number is 1258B.  I wanted to upgrade my carburetor by putting a 7hp or 8hp carb on it.  I just don't know what model/type of carb to buy as there are so many on eBay.   I know mine is a Series 1 carb.  I just need to know the tecumseh model number of a bigger carb that would fit on my engine.  If anyone can help me, I would really appreciate it.  Thanks a lot.