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Cant and won't knock the above as those are great products. My 0.02; I have been running MIKA chain and sprockets without issues. I use the hybrid rear sprocket and it lasts forever. Doesn't hurt that they are a great family ran business that supports all the local events up here in NorCal. Cheers

Here you go (about 191 hours on this part ... maybe more, can confirm later) Note that the chain is a DID x-ring from about 13 years ago. Still going strong, but an older model. I like my old CRFs too much to sell when switching to Yamahas, so I got to see how long the parts really last. :-)

I've had phenomenal luck with the TM Designworks hardware. The polymer they use is quite unique (think strong and ductile, not brittle). I started using them in Baja conditions where I was hitting rocks a lot. Worked great, protected the chain and sprocket perfectly. If you don't ride in those extreme conditions, it might be overkill, but I just kept running their stuff anyway. Also, the chain slider wears like iron (has built-in lube in the polymer), so it's another maintenance-lowering play for me. Would you benefit in seeying my oldest TM Designworks parts on my most abused bike (2007...

I guarantee if you go premium (Ironman sprockets and a good x/z-ring chain) that you'll save money in the long-run and you'll spend way less time on maintenance. X/Z-ring chains stretch slightly at break-in and then you don't have to adjust them for a loooooong time. Also remember, you are riding a 450F. That's waaaay more power than a 250F. Tensile strength of a chain really comes into play here, as a 450F can pull on the chain far harder. You have way less margin/safety factor where Safety Factor (SF) = (maximum tensile strength of chain) / (maximum tension in...

I guarantee if you go premium (Ironman sprockets and a good x/z-ring chain) that you'll save money in the long-run and you'll spend way less time on maintenance. X/Z-ring chains stretch slightly at break-in and then you don't have to adjust them for a loooooong time.

I am absolutely sold on Ironman sprockets by Dirt Tricks and DID x-ring chains (I use their 520ERVT model). Check Ironman sprockets here: https://dirttricks.com/product-category/kawasaki/ Here's are a few semi-recent reviews on Ironman sprockets: https://motocrossactionmag.com/mxa-team-tested-dirt-tricks-zirconium-st… -and- https://advrider.com/f/threads/supersprox-vs-dirt-tricks-ironman-sprock… Check out DID chains and details on the the 520ERVT chain here: https://didchain.com/chains/ "The 520ERVT is designed as our top-of-the-line enduro chain, but it's strength, lightweight, and extended chain life makes it an ultimate racing chain." -and- "This is our lightest and longest lasting X-Ring chain in the 520 size." The best price I can routinely find on this chain is from Chaparral Motorsports...

Added a few more details for reference. Cheers!

Herlings