2 replies to this topic
  • outrunner_57

Posted November 17, 2010 - 12:13 AM


hi, I just bought a 2002 yz426 and wanted to know how reliable these bikes are and what is the fist thing to wear out, how often do you have to rebuild the top end and what are the best mods.

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  • grayracer513

Posted November 17, 2010 - 09:22 AM


They are in the same league with claw hammers, anvils, manhole covers and sundials as far as reliability is concerned. However, it's an 8 year-old bike. There's no hard rule for how often you rebuild them; it's much more an "as needed" kind of thing. The rings and cylinder should ordinarily need attention before the valves do in a YZF. Doing a valve job using titanium valves can be a very expensive proposition, but the thing about any 426 is that you can substitute the stainless valves and valve springs from a 2000 model for a quarter of the price.

A leak down test will tell you a lot about the current condition of things, and you should also check to see where your valve clearances currently are.

Regardless of its condition, do yourself a favor and replace the cam chain as a maintenance item.

  • Ryan426

Posted November 17, 2010 - 12:09 PM


+1 on gray's advice.:p He know what he's talking about.

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