Chain advice?

If you go with an o-ring chain...I would use a DID o-ring chain as it is about the strongest on the market. Just clean, no oil needed except on the center rollers for the sprockets. I have had very long life without issues for many years using them.

Paw Paw

Just go with a DID or Renthal 520 race chain. I have both and it seems the DID stretches faster than the renthal. A o-ring chain is too big and heavy for a 125.

O-rings can be a pain in the butt as I have found out, my next chain will be a renthal 520 chain

I agree with hbdesigns, go with the Renthal race chain, O ring chains drag way to much power out of a 125.

If you go with an O-ring on a 125, you will get extremely good life, but it does cause drag. Depending on how sensitive a rider you are, some riders can feel the drag, and others cannot.

I would go with a non o-ring, but lube it pretty much every time you put fuel in the bike. Any non o-ring chain in the $60 to $100 range will be a great one. I'd personally put the Renthal R1 or DID ERT2 on it, or any high end EK or RK or Tsubaki.

And a side note, you can't just pick a chain by the lbs rating on it. You can have a chain with 8000 lb rating but with a wear index of 300. If you wanna get all techy about it, look up the wear index on the chain. It will be 100 to 1000. Most 520 o-ring chains (or X, or U, or W, or H ring chains), even crappy ones, are around the 500 to 800 range. Most non sealed chains will have a rating from a crappy 100 to a really good rating of around 500 to 600.

Quick, someone get on google and look up the wear index of a DID ERT2 chain and a Renthal 520 non o-ring chain. I'm too lazy.

Go with the RK chain GB520MXU. You wont be sorry. Best chain I've found.

depends how much chain maintenance you feel like doing, feelin lazy? Buy an oring and forget about it.

I've used the Renthal R1 (non o-ring) chains on my RMZ 450 and RM 250 for years and I have had great luck. I replace them once a year which is about 20 hours of riding.