Upgrade Troy Bilt Tomahawk 4hp chipper

[jmu]

I am wondering if it is possible to adapt an 8HP engine to the 4HP unit I currently have. The carb is probably junk and the unit really needs more power but I do not want to pay the rather high price. Thanks!

 

[jmu]

Model 15017 is the lightest duty they made it is what I have. I know they are out of business so it would have to be a right fit kind of thing.