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Everything Dirt Bike
Make / Model Specific
Honda
1998 CR80R
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<blockquote data-quote="2strokesteve89" data-source="post: 210298" data-attributes="member: 1670"><p>The compression ratio for that bike was 8.4:1 to figure what compression psi should be, the calculation is atmospheric pressure multiplied by the first number in the ratio then divided by the last number. So in your case if you are at sea level, 14.7 X 8.4 = 123.48 / 1 = 123.48. For your convenience here is a atmospheric pressure chart.......</p><p></p><p>[ATTACH=full]30189[/ATTACH]</p><p></p><p>There are also the consideration of ambient air temperature, but this formula should get you close enough to get a good idea if the top end is worn out or not.</p></blockquote><p></p>
[QUOTE="2strokesteve89, post: 210298, member: 1670"] The compression ratio for that bike was 8.4:1 to figure what compression psi should be, the calculation is atmospheric pressure multiplied by the first number in the ratio then divided by the last number. So in your case if you are at sea level, 14.7 X 8.4 = 123.48 / 1 = 123.48. For your convenience here is a atmospheric pressure chart....... [ATTACH=full]30189[/ATTACH] There are also the consideration of ambient air temperature, but this formula should get you close enough to get a good idea if the top end is worn out or not. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Honda
1998 CR80R
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