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Message: <blockquote data-quote="SRAD97750" data-source="post: 131773" data-attributes="member: 425">A leakdown compression tester is $45-100 and requires an air compressor.This is the only way to accurately test compression in a 4 stroke engine. It's not about the PSI total, but how fast it leaks off. The tester will have green, yellow, and red bands showing if it's good or bad. Again, a compression reading is useless without the last compression reading taken months before. Compression can only be calculated in a "change over time" format. The number is useless on it's own. -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:" /></blockquote>