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Series B Geeks and Tech anoraks


Well Known and Active Forum Website User
VOC Member
While (or is it whilst?) comparing a very early Series B Rider's Handbook with a later edition I noticed a few variations in Technical Information.
1. The "exhaust closing" figures in the early handbook states 33-37 deg. The later one states 28-33º. That is a range of 9º!
2. 3rd gear ratio is 5.5 in the early edition and 5.6 in the later. There is a similar variation with sidecar gearing.
3. Different recommended Lodge spark plugs.
It also states in my later handbook that valve timing is the same across the whole range of road bikes. surely this isn't so?
The phone number is also in variance between the 2 handbooks; 375 in the early one and 690 in the later one. This may be due to the relocation of the factory or changes in the
telephone system.
I am sure I will discover more variations as I read and compare but comments and input are most welcome.
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Photos from the 2022 North American Rally

Photos from the 2022 Annual Rally

Photos from the 2022 French Rally