07 wr 450, Valve check, adjustment?

8 replies to this topic
  • chevytrkn1

Posted September 17, 2008 - 07:34 PM


How difficult is it to check and adjust the valves on the wr. I always did it on my xr 400. I have the manual for my wr. Should i look into buying a shim kit before i start checking them?


  • coloradobrad

Posted September 17, 2008 - 07:40 PM


It doesn't look too hard. When I do mine I'm going to start in the AM on Sat and then go to the local shop to buy shims. Having a kit would be more convenient though.

  • JSanfilippo

Posted September 17, 2008 - 08:09 PM


Checking the valves requires:

-Seat and tank removal
-Head stay removal
-AIS valve removal (if still equipped)
-valve cover removal.
Very involved IMO.

Adjusting the valves is just like any other DOHC shim under bucket bike. It helps to have narrow feeler gauges as the middle intake is a tight fit.

  • neevothespaniel

Posted September 17, 2008 - 08:19 PM


Its really easy. Take your time and follow some detailed instructions.

Get bike to TDC
Take valve cover off
Get gauges under cams to measure gaps

Removal of the cam caps is easy but you will need a torque wrench to put them back on. All I do when it comes to replacing the shims is to work out what you need, take your old ones to the shop and swap for new sized ones. Sometimes they will gove you money for the old ones :excuseme:

There is a great site to help you along:


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  • Fullbore4

Posted September 17, 2008 - 09:34 PM


Prolly no worry this time of year but ambient temp should be as stated in the manual about 70-80 I think and the bike should be completely cooled off. If I'm not mistaken Honda shims are same diameter and are sold individually.

  • AFJ7732W

Posted September 18, 2008 - 12:30 AM


My dealer says they can do a valve clearance check /adj in a about an hour. I think I'll just let them do it. I getting tired of working on bikes. They did a super job of re-jetting. I have confidence in them.

  • matt4x4

Posted September 18, 2008 - 03:57 AM


It's really easy to check them - you'll have your bike back together in an hour and it's not very technical.
You can always do the adjusting at a later date and save yourself buying a shim kit until you know whether you need it or not. Once measured and recorded and current shim size recorded, you can calculate what shims you need (If you even need them) - order them from your local dealer or on line (or honda - more shim size selection) and save yourself a lot of money compared to buying an entire kit where 90% of the shims will not be used. Future clearance checks will be even faster since you only need to remove the cams the first time you do it to see what size you have in there - after that, it's periodic checks that take 45 minutes tops unless you change out shims.

  • chevytrkn1

Posted September 23, 2008 - 06:44 PM


thanks guys, have to do it soon


Posted September 24, 2008 - 07:44 AM


order them from your local dealer or on line (or honda - more shim size selection) and save yourself a lot of money compared to buying an entire kit where 90% of the shims will not be used.

Tru dat.... I have a HotCams shim kit that came in two separate cases with probably 30 different shim sizes, I have only used four different sizes :excuseme:


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