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Everything Dirt Bike
General Dirt Bike
Need help finding the issue for a Apollo DB-21 Youth bike
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<blockquote data-quote="SRAD97750" data-source="post: 231733" data-attributes="member: 425"><p>The only way to become more confident is to turn wrench.</p><p>Disassembly is Free.</p><p></p><p>60 PSI would probably be too low, but not the correct test for a 4T motor.</p><p>A leakdown test can tell you what percentage of pressure is lost through the engine giving a better idea of health.</p><p>Compression tests are usually used as a comparison to a previous reading.</p><p></p><p>These motors only require a few bolts here and there to check the piston rings for end gap. Valves can be leak tested with isopropyl alcohol and gravity.</p><p>[URL unfurl="true"]https://www.youtube.com/watch?v=dDhGnXz5yKI[/URL]</p><p>This video is just to make you more comfortable with what's inside.</p><p>You don't need to remove the valves or valvetrain unless you find they are leaking.</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: 231733, member: 425"] The only way to become more confident is to turn wrench. Disassembly is Free. 60 PSI would probably be too low, but not the correct test for a 4T motor. A leakdown test can tell you what percentage of pressure is lost through the engine giving a better idea of health. Compression tests are usually used as a comparison to a previous reading. These motors only require a few bolts here and there to check the piston rings for end gap. Valves can be leak tested with isopropyl alcohol and gravity. [URL unfurl="true"]https://www.youtube.com/watch?v=dDhGnXz5yKI[/URL] This video is just to make you more comfortable with what's inside. You don't need to remove the valves or valvetrain unless you find they are leaking. -BIG DAN:thumb: [/QUOTE]
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Everything Dirt Bike
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Need help finding the issue for a Apollo DB-21 Youth bike
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