Re: How long to flush?
yeah 3500 that's the only way you'll get your overflow lines and areas in the motor flushed, if you go to some shops out back they turn motors up in the 4500 to 5000 range on muffs. Scares me to go there though to hold there but setting timing advance requires getting it to 4500 on some motor.
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1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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