air fuel mixture

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seapro25

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May 2, 2010
Messages
4
i have a 2007model 25hp mercury sea pro 2stroke made by tohatsu
i have removed the inlet restrictor and advanced the timing to 25deg which is the same as the 30hp model
does any one know how to adjust the air fuel mixture correctly?
 
achris

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Re: air fuel mixture

seapro25 said:
i have a 2007model 25hp mercury sea pro 2stroke made by tohatsu
i have removed the inlet restrictor and advanced the timing to 25deg which is the same as the 30hp model
Click to expand...

You now run the risk of detonating a piston...

seapro25 said:
does any one know how to adjust the air fuel mixture correctly?
Click to expand...

Change the carb to a 30 hp carb... You'll also need to pull the powerhead and change the exhaust tube.... or all that changing of timing and carb will be for nothing, as the exhaust back pressure will be too high (engine can't breath).

And after all that, the next poor bastard (after you sell that abortion) who tries to work on it will be stuffed up royally as now all the parts he thinks should be on it are different....

If you want a 30hp, sell the 25 and buy a 30hp....

Chris..........
 
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seapro25

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May 2, 2010
Messages
4
Re: air fuel mixture

you dont know what your talking about both engines run the same carb infact the air inlet restrictor gasket is the only part in the entire engine that is different your a dreamer achris get lost
 
saumon

saumon

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Messages
1,452
Re: air fuel mixture

So you really think they make a different hp/model engine simply by adding a restrictor...magical thinking.

A thing that a parts diagram comparison doesn't show you is that the porting could also be different.
 
E

ENSIGN

Lieutenant Junior Grade
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Jun 21, 2009
Messages
1,179
Re: air fuel mixture

What restrictor? Why would you want to restrict fuel?
 
achris

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Re: air fuel mixture

I have had to put 'seapro25' on my ignore list... I received some quite nasty PMs from him... and judging by what you guys ^^^ have posted, expect the same... We are all idiots who don't know what we are talking about (only he wasn't that polite). :D:D

Chris....
indifferent0020.gif
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,627
Re: air fuel mixture

So you really think they make a different hp/model engine simply by adding a restrictor...magical thinking.
Click to expand...

Seapro is correct and the Tohatsu made engine uses a inlet restricter, this and timing is only difference between the 25 and 30 hp models and this is very commonly done on the new engines. A example is the Merc 30/40 as they are the same engine , just a restricter. The Mercosil 18/20/25 is same engine just different carb. Some engines do have a porting difference, example: 2.5 150 block is ported different than a 2.5 200 block but still a 2.5.
My suggestion is before you jump on the bashing bandwagon that you know something about the engine being discussed.. And yes Seapro you were RUDE in your reply!!!!
 

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seapro25

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Re: air fuel mixture

thank you at last someone who knows what they are talking about thank god there are some people out there with a brain
 
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