finally had to do a valve adjustment

5 replies to this topic
  • mjw1

Posted November 29, 2010 - 08:25 PM


After 12 hard years on my 1999 yz400f i have to do a valve adjustment the intake are all tight by .001 and one exaust is tight by .002 the other one is .001. I was hoping to retire the bike this year but with funds being tight i have to ride it for a couple more years.

  • brentn

Posted November 29, 2010 - 08:27 PM



what oil are you using? How often do you do your filter/oil filter changes?

That's amazing!

  • mjw1

Posted November 29, 2010 - 08:35 PM


I run castrol 10-40 syn-blend change every three rides and oil filter every other oil change. I clean the air filter after every ride.

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  • c_dasilva127

Posted November 29, 2010 - 10:04 PM


I havent had my valves adjusted since 2003 on my 00 426. Ive hit the rev limiter about 4 times. I change my oil and filter every 4 rides and clean the air filter after every ride. Still starts first kick hot or cold.

  • grayracer513

Posted November 30, 2010 - 07:54 AM



what oil are you using? How often do you do your filter/oil filter changes?

That's amazing!

You know that oil has little or nothing to do with valve clearance, right?

  • bluethumper98

Posted November 30, 2010 - 08:01 AM


Yep, I have a 98 400 and I don't know much about it's history before I got it from a friends nephew. It has been rode a lot but that thing will always start easy and runs real good. I never even checked the valves yet. I even put new plastic and stuff on it and it looks like a new bike. I wouldn't sweat riding that 400. I compared it to an 06 crf450r and a 05 yz450 and for off road I liked my yz400 better. I have other bikes that are very nice but that yz400 is great. I run a full fmf exhaust and that really woke the bike up.

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