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Hi,

Does anyone here have a CAD drawing for the exhuast pipe flange for Yam 70 CES? Im planning to make a custom pipe, and I have access to a plasma cutter at my university :p

Talkwith someone that competes in Marino Swing Cup in finland. We drive with tohatsu, but almoust half of the boats has 2cyl newer 25hp yammies bolted on.

Yes, I suppose that is why it has only 115 now, I raised the exhaust port 1.5mm.

First start-up yesterday http://youtu.be/wbrnvExB7oM

Any suggestions regardning compression? Mine has only 115psi even with 1mm lowered head (newer one, center plug). Is it enough to give some Powerr? :cool: Or should it be more around 150? The crank...

I think I start out with 150 just to be sure, better rich than lean when breaking in the engine.

What else have done to your engine?

What makes the yammi 40hp tick :cool:

What about the roller shaft on the lowest carburettor, do I need to change the damper shaft to make the carbs work?

Okay, what about the idle jets?

Hi,

My name is Victor, I'm from Finland. And 18 yrs old and I am very interested of race boats.

I have a Yam 40/50hp two-smoker on a 15feet v-hull boat (Marino Swing, check out the...

Does anyone know the differences between the -1988 and -1989 oil injectiom pumps? They do have different part numbers at boats.net, but that is all I know. I got a "new" block -1989, but I have only...

Thank you for your advices! :)
The converter said it would be 188psi, do you think the Boyesen reeds would work with that?

Hi, I'm new at this very nice forum so I don't really know if this is the right place to post this. And sorry for my bad english :)

http://www.boatracingfacts.com/forums/showthread.php?t=13813
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