Buying the new 5 HP for $500-$600 would be the most expensive and least cost effective of your options.
Talk to the independant dealers in your area.
Option 1: They may have a refurbished used unit in the 8 to 10 HP range for about $250-$300 and be willing to take yours as a trade-in.
Option 2: Get an estimate on repairs. If your carb is recently new, but you feel that you are not getting full power it may be valve wear.
Try throwing snow after dark. If the engine lugs and you see blue flame from the exhaust under load, this may indicate the exhaust valve
is not sealing and burning combustion gases are escaping past the valve. They may quote you about $200 for a valve job.
Option 3: DIY. Removed the head and replace the valves with new for about $25-$40 for the valves and $6 for the head gasket. While you have
it apart, replace the fuel and primer lines and clean out the fuel tank. Might want to get a new fuel cap too -- it's vented.
This message was modified Feb 21, 2010 by samdog