Since new, this Yammie has never run as well as the one I bought back in 1993, but has been reliable.
is a 2009 two stroke, (Yamaha 15MSH. Model #684KS1057789), that I use daily for the dingy. Still starts well, choke and a couple of pulls in the morning, but sounds like a bucket of bolts on the way to the dock
, a quarter of a mile away. It idles ok but if I shut down the fuel
right after starting, I'll get a couple of misfires.
RPM's drop and rise constantly, every second or two, enough for me to feel the dingy surging, but not so much anyone would notice who is watching. I'm guessing a couple of hundred rpm's, up and down.
seems to rattle like something's loose and I thought it was the cowling because when I put my hand on it, things quieted down, but now I believe the sound is just reverberating through the cowling.
Changed plugs. Cleaned and changed fuel
strainers. Ran 6 gallons of fuel through it with PEA fuel system cleaner. Stuck a piece of rag under the cowling catch.
I hardly ever run the engine above quarter-throttle; as indicated by the little bars on the grip. Never bring the dingy up on plane.
And things are much better when the engine warms up, but still erratic rev's.
Does this thing just need a tune-up? Or is a bearing going?
No decent mechanics where I'm located so will have to do my own work. (And hopefully learn something.)
Would appreciate any ideas as to how to make this little baby sing!