yamaha 55hp query

[madmart132]

Hi hoping that somebody can help me , I have a small boat fitted with a oldish yamaha 55 hp 2 stroke engine . It seems to have 2 cylinders ? and runs on 100-1 premix the engine code is 55BE and underneath it has 663 then serial number which I cannot make out from the pic I have .Questions are what year ? what plugs ? any reliability issues ? what gearbox oil etc and service times and anything else anybody can think of. Thanks

 

[gil marlin]

Re: yamaha 55hp query

The mix ratio is 50:1...

 

[robert graham]

Re: yamaha 55hp query

Great motor!,50:1 oil/gas, Marine lower unit 90 weight gear oil, buy/install water/fuel separator(Walmart $27), easy 2 screw installation, use Stabil Marine and Ringfree all the time, buy a owners book and manual for that motor which you can find on-line, learn to drain carbs with small brass hex head drain plug on side/bottom of each carb(very easy) and excellent preventive maintenance. Good Luck!