I believe that some of the excess noise on my bike is related to the
metric chain not lining up on the small
american sprocket quite right. I guess what I am aluding to is a believe
that a #40 sprocket does not mate well
with a 5xx or 4xx chain.
A 400 or 500 series chain is not metric, it's a motorcycle version of
Imperial or British Standard chain.
A 420 chain would be 4 times 1/8" pitch (ie. 0.5") and 20 times 1/80" wide
(1/4"), however American and Imperial chain standards differ as to the
roller diameter; American chains have smaller rollers (except at 5/8"
pitch).
There is a completely wierd chain size made for racing Karts, which is the
219. Logically it would be 1/4" pitch, but instead, it's the completely
oddball pitch of 7.35mm!
Paul Compton
www.evguru.co.uk
www.sciroccoev.co.uk
www.batteryvehiclesociety.org.uk
www.morini-mania.co.uk
www.compton.vispa.com/the_named
