scottymac.mac":3rpdxmoa said:
Is it me or arent these Yamahas supposed to be some of the best built motors? 132 total hours, they say about 120 low idle from trolling. I just cant think that a motor that is less than 9 months old should be this way.
Very sorry to hear of the OB troubles. But no motor, nor any man-made product is immune to premature failure. One well-known guide I know of bought 2 new Suzi 4-strokes, only to have one catastrophically fail within 50-hours :shock: and both came off the Mfg line fairly close to each other too.
I don't care whether it's a 2-stroke or 4-stroke, I personally would do a Seafoam decarb every 50-60-hours on ANY OB I own, and maybe sooner if lots of trolling hours.
But like others have stated, some motors don't need it, as some motors just don't carbon up. At best it might help YOUR motor, at worst ... you'll waste a $9 can of Seafoam and your time expended. FYI, it is believed that a lot of the variation as to what make a motor "cleaner" than another one might be due to the 'lost wax casting method' used ... one could be much smoother in internal surfaces (non-machined) than the other.
I would have them SOAK that cylinder in Seafoam overnight! Blow it out, and then do a full decarb regimen via the 1-gallon pony tank method (use the search, it's somewhere listed on CP) ... as I've seen so-called low cylinders come back, as the carbon gets dissolved off the rings and it comes back up. Oh, make sure they do a leak-down test if all others things done and it appears to come back. Please report back ...
Sometimes unintentional 'babying' an OB can cause harm too ... (no offense to you intended). I've always been taught to run fast on way back in and zoom up to max RPMs for a few minutes to "clear her out". But there again, I know of another guide who ALWAYS ran at or within a few hundred RPMs off max ... and he blew up motor after motor :roll: . Duh, wonder why??
