Forums
New posts
Search forums
Members
Current visitors
New profile posts
Search profile posts
What's new
New posts
New profile posts
Latest activity
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Everything Dirt Bike
Make / Model Specific
Yamaha
Valve clearance problem?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="James" data-source="post: 112190" data-attributes="member: 2"><p>Not sure if you realized it but you're using both inches and mm in your measurements, it's best to pick one and stick with it.</p><p> </p><p><strong>Recommended Valve Clearance:</strong></p><ul> <li data-xf-list-type="ul">Intake - .004 to .006 inches or .1 to .15mm</li> <li data-xf-list-type="ul">Exhaust - .007 to .009 inches or .17 to .22mm</li> </ul><p></p><p><img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /> They do, which means you have to put in smaller shims.</p><p> </p><p>Your intake has a clearance of .025 mm (.001 inches) and it needs to be .13 mm, so using the following formula:</p><p><strong>A = (B - C) + D</strong></p><p></p><p><strong>[A]</strong> Replacement shim thickness (The shim size you need to re-install to get the correct valve clearance)</p><p><strong>[B}</strong> Measured valve clearance (The measurement you got in <a href="https://www.dirtbikeaddicts.com/threads/checking-valve-clearances-2005-kx250f.4199/" target="_blank">Part 1</a> with your feeler gauges)</p><p><strong>[C]</strong> Recommended valve clearance (What your clearance is supposed to be)</p><p><strong>[D]</strong> Current shim thickness (The shim you just removed from motor)</p><p> </p><p>A=(.025 - .13) + 1.35</p><p> </p><p>A=1.245mm</p><p> </p><p>So you need a 1.25mm shim.</p><p> </p><p>Here's an Adjusting Valve Clearances How-To I wrote up some time ago. <a href="https://www.dirtbikeaddicts.com/threads/adjusting-valve-clearances-2005-kx250f-rmz250.4214/" target="_blank">https://www.dirtbikeaddicts.com/threads/adjusting-valve-clearances-2005-kx250f-rmz250.4214/</a></p><p> </p><p>With that said, I'd have to agree with Tim in that it's probably about time to get new valves/seats cut.</p></blockquote><p></p>
[QUOTE="James, post: 112190, member: 2"] Not sure if you realized it but you're using both inches and mm in your measurements, it's best to pick one and stick with it. [B]Recommended Valve Clearance:[/B] [LIST] [*]Intake - .004 to .006 inches or .1 to .15mm [*]Exhaust - .007 to .009 inches or .17 to .22mm [/LIST] :thumb: They do, which means you have to put in smaller shims. Your intake has a clearance of .025 mm (.001 inches) and it needs to be .13 mm, so using the following formula: [B]A = (B - C) + D[/B] [B][A][/B] Replacement shim thickness (The shim size you need to re-install to get the correct valve clearance) [B][B}[/B] Measured valve clearance (The measurement you got in [URL='https://www.dirtbikeaddicts.com/threads/checking-valve-clearances-2005-kx250f.4199/']Part 1[/URL] with your feeler gauges) [B][C][/B] Recommended valve clearance (What your clearance is supposed to be) [B][D][/B] Current shim thickness (The shim you just removed from motor) A=(.025 - .13) + 1.35 A=1.245mm So you need a 1.25mm shim. Here's an Adjusting Valve Clearances How-To I wrote up some time ago. [URL]https://www.dirtbikeaddicts.com/threads/adjusting-valve-clearances-2005-kx250f-rmz250.4214/[/URL] With that said, I'd have to agree with Tim in that it's probably about time to get new valves/seats cut. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Everything Dirt Bike
Make / Model Specific
Yamaha
Valve clearance problem?
Top