Gutted for ya and know how it feels. I went through
exactly the same on my 748R about 2 year ago on the A3 when at 7000 miles. It was the Big End bearings. I did not have the dosh to pay anyone to do the work so did it myself over winter and never looked back as know so much now about mechanics and the fact that it's not rocket science! My Haines manual became my bible and everything was bagged, tagged and pictured as I went, it was like a military operation but it worked. I did have help from a mate who had some of the special tools needed.
My Crank was damaged, worn down on one shell side about 2 mm in depth as one of the shells had gone under the other and so just ground it down. Was looking at megga bucks for even a second hand Crank so sent it off and had it re built for about 250 quid.
Once the work was all done it has never run better and it has been pukka ever since. I recently did a complete strip down again after top end damage was caused back at the start of the summer when a piece of pulley back plate sheered off and jammed between belt and pulley which in turn caused the valves to thump the piston and bend etc.
I decided that if I was going to all the trouble of dropping the engine out etc again then I might as well break the lump back open and inspect the re built Crank. Result was the Crank was pristine and the bearings looked like new, I replaced them anyway!
Think about giving it a go yourself fella you might amaze yourself, like I did!
What ever ya do good luck and hope your back out there next year
