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Discussion Starter · #1 ·
Hey guys, so just noticed my chain was missing a couple rollers and wondered what could have caused this random damage. Could rocks getting in between and just cracking them be a cause or is it something else? Bad chain tension?

This is a EK 420 O-ring chain.
I have had it for maybe almost a year.
Stock front sprocket and a Superlite rear sprocket with stock teeth count.

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Thanks!
 

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If your using 420 sprockets and feel confident about adjusting the chain properly, Rear sprocket alignment to the front counter sprocket, And frequent chain maintenance and lubing It most likely a MFG defect or just the fact the EK chains are not really known as a quality chains
The SRO420 O- RING guessing is what you got are only rated for a 100cc max engine and only a tensile strength of 4300

EK compared to other brands

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Discussion Starter · #4 ·
oooh, thanks for the quick reply guys. Thats a pretty inclusive chain chart! Yeah, that sounds like the chain I put on. Everything looks fairly aligned. I check it once a week, clean/lube chain every 2 weeks or after a ride in the rain and usually the day after a gymkhana session.

Either a rock got jammed up in the chain and sprocket, or it's a manufacturing defect such as the hardening process went wrong at some point.
I am beginning to think it could have been rocks/gravel. The parking lot I use does impart a lot of little rocks and I find them all over after a session.

I did switch to an RK 420MKZ chain. It could be placebo but it does feel perkier and quicker to rev lol

Its just so weird and unexpected. Oh well 😂
 
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