1969 T120R Primary Chain Wear

Photo at left shows a newly installed primary chain in 2015. The right-hand photo shows the same chain two years and 11,000 miles later.

Note that I do keep the chain well-adjusted and change the primary chain case oil (30w Non-Detergent) every 1,000 miles.

New primary chain, 2015 Primary chain after 11,000 miles

Hyperlink Junkie's
Illustrated Field Guide
1969 Triumph Bonneville


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