Monday, May 11, 2015

Jack Emmott's Book of Engines, The AJS 7R, Matchless G50 & G45.....

Back in 1964 Jack Emmott ran a business in the UK that serviced racing motorcycle engines, especially the AJS 7R, Matchless G45 and G50 and he published a little blue cover book on the servicing of them....
I've scanned it for you and feel free to download all or part of it....
The sectioned photos above are from "MotorCycle" or"MotorCycling"...

Tuesday, April 28, 2015

The Jones mechanical Tachometer...one of the last maximum hand tachometers still around...part 2, calibration info from the factory....

As mentioned in the previous post on Jones  tachometers this second post contains the calibration instruction for the Jones centrifugal mechanical tachometer and completes the information I have on them.
They differ from the Smiths centrifugal speedometer and tachometer in the method of calibration and is more precise as a result. The Smiths instrument had a dial scale which was not linear whereas the Jones is linear. This meant the Smiths instrument had a series of different dial scales available as part of the calibration method, some seven different dial for their 60mph speedo for example...I will do a post on the Smiths centrifugal/governor speedometer in a future post...
Service Instructions for the Jones Motrola 5100-5200 series speedometer and tachometer..