- Dec 14, 2013
Hi you are all correct, I am thinking of a single chain, not triplex, but one wonders, a belt that is thinner and lighter than a chain why so many failures, I have been riding motorcycles since 1965, most have had chain primary drive, one has had duplex chain, T120 Triton (1958 Featherbed 1959 Bonneville Engine?), triplex (Combat), and never had a failure?Indeed. In fact the belt on my 11:1cr / 920cc Commando is 21mm wide...
Most of my bikes have been standard I must agree, but if you look at the later engines and their primary drive systems they have huge strong cranks, primary drive shafts ect compared to that of a Norton engine, so from an engineering view it doesn't look good.
Out rigger bearings and stronger engine plates, might keep things straight.