98 yz400 valve specs and clutch specs please!!

2 replies to this topic
  • NateZ

Posted March 04, 2005 - 10:08 AM


Im goin to look at a 98 yz400 this afternoon and was wondering if someone could please give me the valve clearence specs for the bike and also the specs for the clutch plates. Anything else i should make sure is good with this bike when i look at it?? Please respond quick.


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  • simimi

Posted March 04, 2005 - 10:58 AM


checking my manual from my YZF400K1, here is what I could find,

Valve Clearance Cold, intake .15~.20mm or .0059~.0079 inch
exhaust .25~.30 or .0098~.0118

Note, align the TDC make on the rotor wth the mark on the crankcase when the piston is at TDC on compression stroke.

Not sure what you need for the clutch, the only spec I see is lever free play, 2~4mm or .08 to .16Inch.

Let me know if you need more info,


  • PumpkinHumper

Posted March 04, 2005 - 12:20 PM


Not sure what you need for the clutch, the only spec I see is lever free play,


I think he is looking for the plate thickness spec. I have it at home somewere.

Found it...

Clutch spring length 50mm....Limit 49mm (no shorter)

Friction plate thickness... 2.9-3.1mm....limit 2.7mm (no thinner)

Metal plate warpage....1mm

Ahhh wait a minute... Thats for the 426. Dont know if they changed at all from the 400-426.

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