87 yamaha 150<br /><br />the motor was used very little the past 3 seasons. during this 3 yr time it has exhibited slow cranking symptoms similar to a weak battery, but typically it would start, run well, and subsequently crank freely till it sat for a few weeks, then crank slowly again. <br /><br />battery is new and fully charged.<br /><br />with the plugs out it would not turn at all by hand. The crank turned a couple degrees but the felt like pistons were holding it. <br /><br />Broke it free by prying on the flywheel, sprayed penetrant oil in the cylinders, and after a while it turn pretty good.<br /><br />Now what i'm wondering is if this is caused by cylinder corrosion. when i turn the thing over by hand i dont feel any clunk or rough spot where the rings may have rusted to the cylinder walls. <br /><br />sounds far fetched but an old retired car mechanic on the dock mentioned it might just be 'gummed up' from sitting and not being able to start it.<br /><br />EDIT.. a driveshaft seal could cause this motor getting stuck ? ever hear of that?
