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Everything Dirt Bike
Make / Model Specific
Yamaha
1993 Yamaha WR500 Teardown/Overhaul
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<blockquote data-quote="SRAD97750" data-source="post: 123154" data-attributes="member: 425"><p>More teardown. Here I start into the engine part of the build. Took about 30 minutes to break down.</p><p><a href="http://www.youtube.com/watch?v=2MJYWTUClWo" target="_blank">http://www.youtube.com/watch?v=2MJYWTUClWo</a></p><p>[media=youtube]2MJYWTUClWo[/media]</p><p><a href="http://www.youtube.com/watch?v=OVs8ZKgVBuo" target="_blank">http://www.youtube.com/watch?v=OVs8ZKgVBuo</a></p><p>[media=youtube]OVs8ZKgVBuo[/media]</p><p> </p><p>Everything looks really clean inside. I am impressed with how well it has taken the desert dust.</p><p>2 Years ago when I rebuilt, due to a cracked piston skirt, I took some measurements.</p><p>03/05/2011</p><p>Big end bearing play 0.000" (Min/Max 0.000"/0.009")</p><p>Piston ring end gap 0.012" and 0.014" (Min/Max 0.010"/0.024")</p><p>New measurements taken</p><p>01/29/2013</p><p>Big end bearing play 0.004" (Min/Max 0.000"/0.009")</p><p>Piston ring end gap 0.027" and 0.032" (Min/Max 0.010"/0.024")</p><p> </p><p>So, over time I have reached max wear on the rings. Time for new.</p><p>And the big end bearing is "moving" over time, so it's time to change it.</p><p>Piston looks new with a little soot built on the crown. Perfectly new demensions, and cylinder/piston clearance is still new spec.</p><p>Piston pin looks burned, I'll swap it, along with a new pin bearing of course. New clips to boot.</p><p> </p><p>[ATTACH=full]12069[/ATTACH]</p><p> </p><p>[ATTACH=full]12070[/ATTACH]</p><p> </p><p>[ATTACH=full]12068[/ATTACH]</p><p> </p><p>Cylinder looks great, I'll hit it with a hone prior to installing new rings.</p><p> </p><p>[ATTACH=full]12071[/ATTACH]</p><p> </p><p>[ATTACH=full]12072[/ATTACH]</p><p> </p><p>[ATTACH=full]12073[/ATTACH]</p><p> </p><p>[ATTACH=full]12074[/ATTACH]</p><p> </p><p>Clutch basket is mildly notched, not sure what to think about it.... <img src="https://www.dirtbikeaddicts.com/static/images/smilies/noidea.gif" class="smilie" loading="lazy" alt=":noidea:" title="Noidea :noidea:" data-shortname=":noidea:" /></p><p> </p><p>[ATTACH=full]12080[/ATTACH]</p><p> </p><p>[ATTACH=full]12081[/ATTACH]</p><p> </p><p>[ATTACH=full]12082[/ATTACH]</p><p> </p><p>[ATTACH=full]12076[/ATTACH]</p><p> </p><p>[ATTACH=full]12077[/ATTACH]</p><p> </p><p>[ATTACH=full]12078[/ATTACH]</p><p> </p><p>[ATTACH=full]12079[/ATTACH]</p><p> </p><p>[ATTACH=full]12075[/ATTACH]</p><p> </p><p>[ATTACH=full]12083[/ATTACH]</p><p> </p><p>[ATTACH=full]12084[/ATTACH]</p><p> </p><p>[ATTACH=full]12085[/ATTACH]</p><p> </p><p>-BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p></blockquote><p></p>
[QUOTE="SRAD97750, post: 123154, member: 425"] More teardown. Here I start into the engine part of the build. Took about 30 minutes to break down. [url]http://www.youtube.com/watch?v=2MJYWTUClWo[/url] [media=youtube]2MJYWTUClWo[/media] [url]http://www.youtube.com/watch?v=OVs8ZKgVBuo[/url] [media=youtube]OVs8ZKgVBuo[/media] Everything looks really clean inside. I am impressed with how well it has taken the desert dust. 2 Years ago when I rebuilt, due to a cracked piston skirt, I took some measurements. 03/05/2011 Big end bearing play 0.000" (Min/Max 0.000"/0.009") Piston ring end gap 0.012" and 0.014" (Min/Max 0.010"/0.024") New measurements taken 01/29/2013 Big end bearing play 0.004" (Min/Max 0.000"/0.009") Piston ring end gap 0.027" and 0.032" (Min/Max 0.010"/0.024") So, over time I have reached max wear on the rings. Time for new. And the big end bearing is "moving" over time, so it's time to change it. Piston looks new with a little soot built on the crown. Perfectly new demensions, and cylinder/piston clearance is still new spec. Piston pin looks burned, I'll swap it, along with a new pin bearing of course. New clips to boot. [ATTACH=full]12069[/ATTACH] [ATTACH=full]12070[/ATTACH] [ATTACH=full]12068[/ATTACH] Cylinder looks great, I'll hit it with a hone prior to installing new rings. [ATTACH=full]12071[/ATTACH] [ATTACH=full]12072[/ATTACH] [ATTACH=full]12073[/ATTACH] [ATTACH=full]12074[/ATTACH] Clutch basket is mildly notched, not sure what to think about it.... :noidea: [ATTACH=full]12080[/ATTACH] [ATTACH=full]12081[/ATTACH] [ATTACH=full]12082[/ATTACH] [ATTACH=full]12076[/ATTACH] [ATTACH=full]12077[/ATTACH] [ATTACH=full]12078[/ATTACH] [ATTACH=full]12079[/ATTACH] [ATTACH=full]12075[/ATTACH] [ATTACH=full]12083[/ATTACH] [ATTACH=full]12084[/ATTACH] [ATTACH=full]12085[/ATTACH] -BIG DAN:thumb: [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1993 Yamaha WR500 Teardown/Overhaul
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