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The unit twins were very popular in sidecar racing, but only after the timing side main bearing was converted to a proper journal bearing, and the crank converted to end-feed (per Norton and Triumph).Devimead and SRM in the UK are/were the people to do the conversion, but I don't know about the US.I had a '68 Lightning which locked the crank solid on the motorway due to oil starvation, and I wouldn't entertain another one unless this mod has been done - it didn't recall it having any particular main bearing rumble before it let go, so not easy to say when it would happen...Funny how the older A7/A10 twins had a smaller diameter plain bearing, but were OK in this respect.Otherwise, everything else was pretty good.
The unit twins were very popular in sidecar racing, but only after the timing side main bearing was converted to a proper journal bearing, and the crank converted to end-feed (per Norton and Triumph).
Devimead and SRM in the UK are/were the people to do the conversion, but I don't know about the US.
I had a '68 Lightning which locked the crank solid on the motorway due to oil starvation, and I wouldn't entertain another one unless this mod has been done - it didn't recall it having any particular main bearing rumble before it let go, so not easy to say when it would happen...
Funny how the older A7/A10 twins had a smaller diameter plain bearing, but were OK in this respect.
Otherwise, everything else was pretty good.
