So I've been trying to post for weeks and finally figured out this site does not accept posts from Ipad's or Iphones...someone should fix that.
I bought a 500 Bullet Sidecar rig with a bad engine.
The big end is gone.
I tore the engine down, bought new parts (thanks to the forum members who recommended suppliers). I bought new rockers, rod, piston and bearings from Hitchcocks. The rest of the parts came frome Ebay.
The one area of the repair that I found interesting was crankshaft or flywheel truing. There is very little real information on this for the Royal Enfield. Most of the manuals say to send it off to a qualified shop.
Having some knowledge from my Harley days, I knew the basics on how to do this. I made a V-edge fixture and set about doing this myself. I pressed the big end into the timing side flywheel being careful to align the oil holes. I torqued this side to 100 Ft. Lbs. assuming that I didn't want things to move while truing.
I put the thrust washer, rod and thrust washer on the shaft and pressed the other flywheel on to the shaft.
I then used two pieces of channel iron in my press to roughly align the flywheels.
I then torqued the other nut to 100 Ft. Lbs.
Then I set the assembly in my homemade fixture to measure runout.
https://www.flickr.com/photos/22794316@N03/44700776601/in/dateposted-public/Intially it showed .011" on the clutch side shaft. The timing side was holding steady. This meant that the alignment was out of concentricity rather than squeezed or spread on the flywheels.
It took three times whacking it with a lead hammer to bring it to almost zero run out.
I'm not sure this is something everyone could do, but I found it fun and interesting and thought I would share it here. I should have taken more pictures, but I wasn't sure I would ever be able to post to this forum.