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Author Topic: Compression Tests - Affect of Carbs, Air Filters, Exhaust?  (Read 133 times)

Offline black350

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When doing a compression test, would running non-stock carbs, air filters, or mufflers affect the overall compression value? Could a test be run without all of the above and give accurate results?


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Offline advCo

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Re: Compression Tests - Affect of Carbs, Air Filters, Exhaust?
« Reply #1 on: Aug 01, 2017, 11:43:54 »
When doing a compression test, would running non-stock carbs, air filters, or mufflers affect the overall compression value?

No.

You must make sure to hold the throttle all the way open if carbs are fitted while doing a compression test.

Compression is a result of how well your piston/rings and valves 'seal' the combustion chamber, so anything outside of that does not effect the numbers
« Last Edit: Aug 01, 2017, 11:52:51 by advCo »
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Offline Sonreir™

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Re: Compression Tests - Affect of Carbs, Air Filters, Exhaust?
« Reply #2 on: Aug 01, 2017, 11:54:17 »
When doing a compression test, would running non-stock carbs, air filters, or mufflers affect the overall compression value? Could a test be run without all of the above and give accurate results?


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Depends on the carbs. CV carbs will generally read a little low if they're still on the bike. Slide carbs would be OK with holding the throttle open, though. Other items you mentioned would have minimal effect.
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