Re: tiller to manual remote and carb ??
You can locate salavage dealers in the STICKY 's on here and see if one of them has the parts to convert to remote steering. As for switching carb and exhaust to make it a 15hp not the answer as the blocks are diffrent I belive. It would be cheaper to buy another motor of more HP and setup for remote than what it will cost for parts to switch the 9.9 over. There is a 18 and a 25, set up for remote,
on Ebay for sale, or check local Craigs list for one. JMO
Oldman570