18 hp twin Briggs no power

I have a Grasshopper mower with a twin cylinder briggs that doesn"t have any power when the mower deck is engaged.

It works ok just driving around but when you enage the deck it really bogs the motor down and if you try to move it it wants to stall out.

I tried turning the mower deck by hand (with the engine off of course) and it doesn"t turn hard or anything

Rebuilt the carb but it didn"t help

Any help greatly appreciated

Thank you

Kent

I did all the tuneup stuff, went through the deck, and finally had to face the fact that the engine was simply worn out and didn't have enough power to run the deck and move the tractor.

I went to John Deere to see about a short block. The parts man told me, "You don't even want to know what John Deere wants for a short block. I can sell you a brand new 12 horse Briggs engine that will bolt right on for $419.00."

The rest of the unit was still in good shape so I went for it. The parts man was right. The new engine was complete, starter and all. All I had to do was unbolt the old 11 horse, set the new 12 horse engine on, bolt it down, put the pulleys on the bottom, hook up the ignition wire, and throttle and choke cables, and fire it up.

Going from a tired 11 horse to a new 12 horse sure woke that little 111 up!

Thanks!