15Hp Running Rich

[Benjamin]

I have an oldish 15 Yamaha 15D in fairly good nick. It starts on first pull, idles like clockwork and even pulls away on the water, but there is just not enough power to plane a small dinghy. Cleaned the carb, checked the timing & plugs, etc. I made sure fuel mix is correct (100:1) but the engine smokes quite a lot and when I start it in a tank. it foms a layer of unburned oil and fuel on the surface of the water. I'm now starting to wonder if this is not caused by a worn pilot jet ( #56 - 14342-28-00) or perhaps a worn carb? Any comments welcomed

[Benjamin]

Wish I could simply pop in at my local Yamaha dealership and buy the part over the counter, but here in the RSA everything gets ordered on demand from overseas. Don't mind paying and waiting for a part, but with shipping costs, it's just not on

[99yam40]

does this motor have a choke?
or is it aa prime start model for adding extra fuel on cold start?

[Benjamin]

99Yam40, it has a manual choke, checked it with the air cleaner removed, no problem there, thanks

[TownsendsFJR1300]

How's the spark plug look?

[Benjamin]

Spark plugs are good, thanks

[TownsendsFJR1300]

Spark plugs are good, thanks

Their all the same color? Blackened, tan, ?

[Benjamin]

TownsendsFJR1300 spark plugs are black and damp, but spark is good, hence my suspicion that there is too much fuel present in the cylinders