XS1100 Engine Help

[JP450]

New member here but was a member of xs11.com when it was around. I need some guidance on an engine rebuild. Here’s the short story: about 20 years ago when I was young and dumb, full of big ideas but piss poor execution I decided I was going to restore my 1981 XS11. I took the engine completely apart, and didn’t know enough at the time to mark which pistons went in which cylinder. The pistons are still assembled with the rods. What’s the best way to go about reassembly. Am I looking at full machining before assembly to get things right? The bike had about 28k miles when taken apart. Thank you.

[DiverRay]

The rods have marks on the bosses, IIRC. The crank also has marks for the bearings, both main and rod, that may help you match them up. Get the 1978 XS1100 repair manual if you don't already have one. It gives all the important information about the engine that is not in the later repair manuals. I do have PDF's of the manual, but it is a little big to send through the pm here. My email is not liked by gmail, but I can send through most other systems with no problems.

[JP450]

Awesome thank you. I’ll take a look. I know I have a repair manual, but I’m not sure what year it’s for.

[DiverRay]

The 1978 IS the repair manual for the XS1100. EVERYTHING after that is add on modules that will show what changed, but NOT the basics. That is the way Yamaha did things back when I bought my first XS1100.

[DEEBS11]

Ray, is this the part number for the original manual?

[DiverRay]

Yes, it is. Mine is the earlier version, with the LIT on the left, and 2H7-28197-10 on the right bottom.