F6 4-stroke/ 2 cylinder detune?

[Aubrey44]

Hello all,

I searched long and hard and couldn't find anything on forum. So here goes,,,

Any yamaha experts here to help answer this question.... I have a rather large 6hp, 4-stroke, 2-cylinder portable outboard... The thing is as big and heavy as an 8hp or even 9.9hp. I am wondering if this is a detuned unit and i can possibly change a couple of parts or alter some features and gain the extra few horsepower? I have never seen a 6hp this large before in my life and this is what has me curious...

Thanks a lot

[panasonic]

I don't know..that question is asked frequently here for different engines.

You could look at the parts breakdown(on here) for yours and a 8hp of the same year and see what is the differents between the two. A tedious job.

You did not list what year or model you have.

[Aubrey44]

A tedious job indeed! I have thought of that approach actually... guess in the end it may be the only option. Of course Yamaha dealers aren’t much help...

Funny thing about my unit.... on the Yamaha website, my model # does not actually come up. So i dont know what year the unit is and hence do not know what manuals to look at??

Anyways the model is F6MSHG, the other Number is 60N S 1009847

[TownsendsFJR1300]

A tedious job indeed! I have thought of that approach actually... guess in the end it may be the only option. Of course Yamaha dealers aren’t much help...

Funny thing about my unit.... on the Yamaha website, my model # does not actually come up. So i dont know what year the unit is and hence do not know what manuals to look at??

Anyways the model is F6MSHG, the other Number is 60N S 1009847

Looks like an '05 to me:

https://www.boats.net/catalog/yamaha...ar/2005/f6mshd

[boscoe99]

A tedious job indeed! I have thought of that approach actually... guess in the end it may be the only option. Of course Yamaha dealers aren’t much help...

Funny thing about my unit.... on the Yamaha website, my model # does not actually come up. So i dont know what year the unit is and hence do not know what manuals to look at??

Anyways the model is F6MSHG, the other Number is 60N S 1009847

Possible tedious or not. But not something a Yamaha dealer is trained to do. Or wants to do.

At what Yamaha website are you looking? Yamaha USA? If so, an F6MSHG is not a model they sold. Won't be on their website.

In what country was your motor purchased? What is the month and year of production on the data tag?

[TownsendsFJR1300]

Looks like an '05 to me:

https://www.boats.net/catalog/yamaha...ar/2005/f6mshd

Nevermind....... Tks Boscoe

[99yam40]

Looks like an '05 to me:

https://www.boats.net/catalog/yamaha...ar/2005/f6mshd

he said G and you posted D

[TownsendsFJR1300]

he said G and you posted D

That's why I posted "nevermind"..

[boscoe99]

It happens.

[Aubrey44]

Possible tedious or not. But not something a Yamaha dealer is trained to do. Or wants to do.

At what Yamaha website are you looking? Yamaha USA? If so, an F6MSHG is not a model they sold. Won't be on their website.

In what country was your motor purchased? What is the month and year of production on the data tag?

This motor was handed down to me... i am from Northern Canada, i have been using the Canadian Yamaha website. I would suspect it was bought by a local dealer...

the closest i can come to finding is 2008 BUT the model is F6MSG not my F6MSHG...

where would the month/year production tag be??


thanks alot for the help

[boscoe99]

Other side of the motor.
zmy.jpg

[boscoe99]

A Canuck F6MH(S)G is going to be the equivalent of a US F6AM(S)H. Same year US F8CM(S)H.

Use the Yamaha USA parts catalog to compare the F6 to the F8. To see how similar or different they are. Remove the F6 parts and install the F8 parts.

Not that particularly onerous. One the parts books in different browsers. Compare the parts side by side.

For instance
zf6c.jpgzf6.jpg

[Aubrey44]

Beautiful pictures! Tanks alot for the help... I'll have to look at the transom next time i am at camp to verify the year.... make sure i am using the appropriate catalogue for my year.

Now i just need to get my hands on the USA parts catalogue for both the F6 and F8.

Great forum! Will recommend to my Yamaha friends..

[boscoe99]

Www.yamahaoutboards.com

Click on maintenance. Then click on outboard parts.

[Aubrey44]

Ok.... so just reviving this for brief commentary on what you all think...

I have compared all the parts for F6 to the F8 on the USA parts website and the Canadian parts website.... And have found the following...

These are the only parts that are different between both units....

Part No. Part Name
68T-85550-11 ROTOR ASSY
68T-85520-00 COIL, CHARGE
68T-85533-10 COIL, LIGHTING
68T-85540-00 C.D.I. UNIT ASSY
68T-41283-00 LEVER, FREE ACCEL.
68T-41211-00 LINK, ACCEL.

Are there any experienced engine mechanics who think that these would be all the parts required to gain 2 extra horsepower?? I guess I expected the change would have been in the carb or valve.. not the electronics.... Any comments??

Thanks alot