2278 YD - AJS R7 349cc. OHC nummer 6 – 1930

For some 6 years the “ Bigport” series had been very successful, but in 1928 it was decided it was time to give the 1929 model range a totally new appearance.
No less than 20 “ improvements” were made and they were certainly no detail changes.
To name a few: a redesigned frame giving a lower saddle height, a graceful saddle tank , a separate oil tank, enclosed valve mechanism and last but not least brightly coloured side panels on the tank.
The Model range spanned from the 9.96 HP twin passenger combo ( M1) to the 2.48 HP lightweight ( M12); AJS started numbering with the highest capacity models, which was rather unusual with model numbering systems then.
A noticeable point for 1930 was that the old familiar black-and-gold finish was back: it replaced the magenta of the 1929 model year.
For 1930 two models with overhead camshaft were marketed, the 349 cc “R7”and the 498 cc “R 10”.
These models had a chain driven OHC engine with patent tensioning device and reaction damper and were marketed as “over the counter” racing machine with special features like sports-type handlebars, twist grip carb control and narrow racing-type mudguards.

Motorcycle & text courtesy of Yesterdays NL