2002 YZ426F problems

4 replies to this topic
  • motocrosser316

Posted January 18, 2009 - 02:51 PM


Alright I may have a serious problem on my hands. I changed the plug on my 2002 YZ426F the other day and after I pulled the plug out I pushed the kick start down and tried covering the hole with my finger seeing if the bike still had compression forgetting the holes so far down :thumbsup:. So anyhow I put the plug back in and got it all put back together and tried kicking it and it had no compression. I also noticed that the decompression lever didn't have any resistance to it like the valve with stuck, so I took the plug out and put everything back together; I noticed the decompression lever had resistance to it again so I'm guessing the valve got stuck somehow, but have no idea. I know its probably time for a new bike but would rather stay with the 426. I also thougth that I may need new rings or adjust the valves. any advice would be helpful thanks

  • DeeCee

Posted January 18, 2009 - 07:44 PM


Have you started an run the bike since you experienced this problem ? If yes, how did it run. If it ran OK chances are you just have a sticky decompression problem (possibly cable related).

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  • pevan99

Posted January 19, 2009 - 01:09 AM


Do your self a favor and change the exhaust cam with the new auto decomprssion cam it's the best this I did to my 426

  • pevan99

Posted January 19, 2009 - 01:18 AM


Does anybody know what rear sprocket to use on my 02 yz426 to reduce the torque?

  • MotoPhotog

Posted January 19, 2009 - 06:30 AM


Does anybody know what rear sprocket to use on my 02 yz426 to reduce the torque?

Pevan, not sure what kind of riding you did. But I went down 1 tooth in the front, so that 1st gear was more friendly on the clutch, and in the slow stuff. What a difference!:thumbsup: I did notice though, that the previous owner actually had +1 in the rear already.

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