i have mercruiser ser#3965251 under load it knocks, at idel it runs somewhat smooth. would out of time be my problem, please i need help would you tell me what year it is. thank you.
Timing iz the first thing I'd check chaboot, and I'd be checkin' it real SOON. Preignition is like a cuttin' torch on pistons.<br /><br />c/6<br /><br />Hooty
