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1989 yz 80 compression - Motorcycles

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Any 2 stroke motor with less than 90 psi will be hard/ impossible to start and will not idle well if it does start. A fresh bore, piston and rings on this model should have about 150psi.

Posted on Dec 30, 2012

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Motocross Color Scheme
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has this bike been winterized with fuel stabulizer?

has this bike got enough compression?

is the oil injection working?

yes reeds are slighly opened
if tamper with
will loose - acceleration - top end power

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