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.


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 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.

Related Content


Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  57 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.