Does the chain turn a rust color even though it isn't exposed to rain? The chain requires constant adjustment.
Yes it does. I have needed to adjust it every 3-500 miles since it was new which has been a PIA. At 5000 miles on chain and sprockets, they're nearly toast and thats with regular lubrication (Castrol spray and now 90w oil-no difference that I see) , proper alignment and mostly highway miles, and with an old man at the controls.
The replacement chain is a 630 EK Sport non O-ring and the 15/41 sprockets are Kimpex. My best guess, since the rear sprocket bolt holes were not drilled accurately and required hand filing to install and centre, is that the teeth are also not well matched to the chain and have caused the premature wear. The wear is measureable on the chain and visible on the sprockets.
I have heard Vern Amblers' name associated with SOHCs, but have not met him. 38C on the prairies yesterday
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