Hi Gary T here,
Can anyone tell me if I can put a larger engine on my ride on mower? I currently have a 10 HP on an old Craftsman LTV/10. The mower is in good shape, just needs an engine, and I think it could use more power? Anybody got any ideas? Thanks

Your biggest limit is going to be what engines will fit the shaft pully you need for your tractor... larger engines have larger diameter shafts beyond certain ranges.

Hi,
The shaft size has been mostly standardized in the last few years. Some links would be:
- Small Engine Surplus.com (http://www.smallenginesurplus.com/)
Small Engine Suppliers - Your online source for Replacement Small Engines, Tools & Parts (http://www.smallenginesuppliers.com/)
Welcome - Small Engine Warehouse (http://www.smallenginewarehouse.com/)
Small Engines - small engine - Welcome to Small Engine Distributors, The Dealer's First Call Source for Lawn & Garden Supplies. Contact us at [email protected] or [email protected] - Our wholesale website is http://www.sedkc.com & ht (http://www.smallenginedistributors.net/)
Tulsa Engine Warehouse is your source for small gas engines such as Briggs & Stratton, Honda, Kohler, Kawasaki We have complete small gas engines and also lawnmower parts for gas engines. (http://tewarehouse.com/)
As well as Northern Hydraulics
Peace,
Clarke
PS Probably wise to go with ones with mufflers etc. attached.