Main Motorcycle: The one I am riding
Join Date: Oct 2007
Location: Plympton, Massachusetts
Other Motorcycle: Yes, a few
The two inner 5/16" studs are/were installed upside down. Running the end of the thread up against the cylinder head surface leads to distorted bores, or worse. For that matter so where the 4 outer 3/8" studs, but they did that at the factory and at this point another story.
All Triumph hardware (torque figures) assume you assemble dry.
Depending upon your budget I would get a new, or used cylinder. You should be able to get a 71-4005 cylinder new stateside for a little bit over $400-450. To be honest I would like the cylinder semi-finished so I could set the clearance and surface finish myself.
There are two cylinders available: AERCO made in England and LF Harris made in Taiwan. Both can have personalities.
On the 750 there is very little material in the casting to sleeve it. The area around the 5/16" inner studs is very thin to start with and the cuts to allow a wrench to go over the cylinder base nuts leave very little of the casting available for sleeving. It would be a crap shoot at best to try to sleeve it. Considering decent sleeves are running over $100 each, and add labor, the finished job would only cost a little less than a new one. Then the cylinder would be so thin that it might fail in short order.
The closest shop that I would recommend is in Honey Brook PA - Long's Custom Service 610-286-5870. But like most places in PA you can't get there from where you live. That is in any kind of straight line. It is a specialty machine shop does Harley to Vincent.