1986??? 20hp fuel pump Diaphragm

[lowdouble]

I have what I presume is a late 1980s Yamaha 20hp outboard and the Diaphragm in the petrol pump has torn, so needs replacing.
The engines ID plate reads : YAMAHA 20BM, 653 S 005697.
how old is it, where was it made and can I still get this part?

Thanks for your help

Andrew Mcfarlane.

[boats.net]

We don't have any information or parts listing on that model, the only 20hp that was sold here in USA was in 1996 and 1997.

[lowdouble]

Thanks for that information.
are there any other forums for yamaha that I could get the info from?
or is there any other markings that would show the engines age/origin?

[mitch]

It is just a mikuni fuel pump that is used there seems to be 2 different ones one with the Mylar diaphram (newer ) or one with the rubber type (older) . but the bolt patten is the same .

my guess is you have the one with the rubber diaphram but I have inter changed them both and they will still work it is only a basic fuel pump .



Just get a new pump and fit ,take your old one in to your yammy dealer and get one .

[lowdouble]

would I be able to make my own Diaphragm? and if so from what material?
here are some pictures of the engine if this helps identification.

[boats.net]

That looks like it is same as a C25 model, here is link Yamaha Outboard Parts 1993 C25MLHR FUEL TANK Diagram

[mitch]

nah just get a new pump or a kit like boats.net ..........said .............. only 50 bucks or 11 bucks for a kit