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Hose diagram for EX/STX 340/440 70's

2K views 2 replies 2 participants last post by  Volvo742 
#1 ·
Hi!

I'm seeking a hose diagram of my Yamaha STX 340 from 1977 or a EX from the same year. The EX and STX is almost the same.

I have an old picture taken on my oil injection pump. I only need to know if the pipe 4 or 5 is the input or the output of oil from the oil tank. Should i also plug the rest of the pipes? I don't trust the oil injection of this old snowmobile :)

 
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#2 ·
Pump looks a little different than my 1979 Ex, but the smaller fittings (1,2,3) will be pump outputs.

The bigger fittings (4,5) go to the oil tank. Upper one has an inline filter in it, and runs to the forward most fitting on the tank. The lower runs down the side of the tank and tees into the oil level sight line.
 
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