Mariner / yamaha 30

[Roflhat]

Looking for some info on these, the 2 cyl ones. Came in 25hp and 30hp as far as I know. What kind of crank have they got? Is it pressed together or a solid steel one like the 55hp 2 cyl? How can I disconnect the rev limiter? Can I get boyesen reeds for it? Will the 55hp 2cyl carbs go on?

Cheers

[Fastjeff57]

Crank is one piece. No idea on the rev limiter.

Jeff

[lcp]

there is two version of cdm ignition in this motor.the one with TPM 'timing protector module"(this not the one we want) , the one with rpm limiter( this is the one we want) just remove the limiter than you are good for 7000rpm !

[Roflhat]

Thanks guys. I'll try and get a picture of it today. So if it's the one with the limiter which wire do I cut?

[lcp]

just remove the entire unit.

[Roflhat]

Here's the engine:
http://i1013.photobucket.com/albums/af256/Roflhat/IMG_2878.jpg (http://s1013.photobucket.com/user/Roflhat/media/IMG_2878.jpg.html)

do I remove this box? :
http://i1013.photobucket.com/albums/af256/Roflhat/IMG_2877.jpg (http://s1013.photobucket.com/user/Roflhat/media/IMG_2877.jpg.html)

[lcp]

it is a yamaha 30hp. there is no rpm limiter the CDI unit.we use to rave up to 8000 with the stock up. the only things you need to do is convert the ignition to the fixed timing plate version.and swap the flywheel as well. this
yamaha 30hp 2 cylinder been conquer 30hp tunnel category for so many year in my country before those yamaha 30hp 3cylinder come along.

[lcp]

dual barrrel carb...60hp piston...fingerport...wake this thing up!!

[Roflhat]

Thanks lcp, this is all good stuff.
I'm doing this on a budget (£0), trying to do everything with bits I have just lying around. I have a 30hp engine complete, and a non-runner 25hp of the same engine. I was thinking of doing above prop exhaust mod, removing the flywheel ring gear and the rev limiter. I have a 10 x 15p chopper for a tohatsu 30 which I'm hoping will go on. There's also a non runner 55hp 2cyl if any of the parts will go on.

[Roflhat]

So am I right in saying this engine has no rev limiter?

[25XS]

So am I right in saying this engine has no rev limiter?

How about just posting the model number and serial number... None of us can provide an educated answer with a dark picture of the powerhead.

You can simply look up the parts diagram on www.boats.net and read the part description of the electronic components to know for sure. If you decide to clean up the cylinders, I have a NOS set of Wiseco pistons, 0.020" or 0.50mm oversize for that engine available. Wiseco 586P2 (qty 2)

Tom

[25XS]

Also, every one of the 20/25/28/30 Yamaha built Mariner engines I have seen, and all the ones on my Mercury Parts program have pressed together cranks... Without exception.