How much compression

onthebrinc

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May 30, 2011
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How many psi of compression should i have on a b&s 5 hp moedl 10m902 0489 e2?
 

ILENGINE

Lawn Pro
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May 6, 2010
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90 psi or more would be desirable but I have seen new engines with 40-60 psi run fine. 30 psi is either hard to start or won't start at all.
 
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