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Thanks Paul, it seems like mine has a different problem than the 2 stroke. I don't know if I forgot to mention that Mine is a 4-stroke also mine will not ever run smoothly and will rev-up and stall when the choke is pushed in/ rev up un controllably when the choke is out.

Seems like fully cleaning the carb is the best option, any other ideas of what it might be?

Thanks,
James
Both2 & 4 strokes can suffer from fuel starvation problems in similar manners.
Assuming your ignition system is sound, it sounds like you may have a severe air leak, possibly along with fuel, restriction problems. Suggest you check/tighten the carb mounting bolts, not too tight, check all hose clamps & fittings & make sure the tank is venting properly. Try running it with the fill cap loosened or off. And all the other stuff mentioned in the other post. The linkage thing is also a possibility, but unless damaged by impact or over stressed, or loose connectors, not much has ever happened to me with the 10
outboards I have owned.

Paul T

My guess is that that there is debris in some/all parts of the carb
 

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Paul, I have checked all the carburettor/hoses and they all seem good, can the symptoms I have described not be explained by a dirty carburettor alone?
Could be, although the surging thing has me puzzled. Could be debris floating around, then being sucked up into a jet or passageway, & then being released again? Before taking the carb off, try dropping the float bowl, turn the gas on, & work the float up & down to flow fuel through the float valve. If there is any debris in the bowl, I would suggest cleaning the carb.

I have no experience with your particular engine/carb but suggest you bring the carb home, spread out a large towel, take it apart in sequence, from left to right & re-assemble in reverse order. Be careful of possible check valves, balls with springs behind them, or other loose parts when blowing things out with compressed air. Taking pictures while dis-assembling may help later.

Go slow, take your time, & tread lightly. If you tear a gasket or it looks bad, Yamaha no doubt sells a re-build kit, with new gaskets & o rings, probably a good thing to have before starting.

Or, just take the carb to a shop. :D

Paul T
 
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