Tohatsu 9.9D2 after wrong modification?

[Szmaja]

Good morning dear forum. I will be grateful for dispelling my doubts.

I bought a Tohatsu 9.9D2 from 2002, with throttle cam 362-63718-0 installed. Thanks from reading the forum I already know that this is the wrong cam version for this engine (the correct one is 3M3-63718-0). Nevertheless, the engine is running perfectly fine: it has power, starts up quickly and burns normal amounts of fuel.

Timimg was set at 25 °
The butterfly could fly in 180 ° ...

Please confirm or correct me if Im wrong, whether this modification needs to be fixed?

Engine will work better with newer cam 3M3-63718-0?

 

[pvanv]

3M3637180M is the 15/18 throttle cam, so you got a free upgrade.

 

[Szmaja]

Good morning, sorry for my language above I try to write that my Tohatsu 9.9D2 has throttle cam nr 362-63718-0 installed (You can see it on attached photo).

This modification was made corectly?

Thank You for help.

 

[pvanv]

Apparently. Many upgrade the old 9.9s to 15s by installing that cam.

 

[Szmaja]

Interesting, what is a difrence when they work. The shape in midle range of 362-63718-0 this steep profile indicates that the engine can pick up speed faster. It could give more dynamic haracteristic in midle range. Thanks for help. Best regards,

 

[MattFL]

I would guess the original cam probably doesn't open the carburetor all the way.

 

[Szmaja]

I wonder what is a difrence without cams: 3M3-63718-0M and 362-63718-0. Can they give different characteristics during acceleration?

 

[pvanv]

The 3M3 is also used with the bigger carb to get 18 hp.

 

[Argypa]

Does anyone knows the correct position for the timing and if it is easy a photo of the timing.