Technical Data of Mariner 9.9HP 209ccm 2-Stroke Carb for the purpose of tuning a 6HP

SaabFAN

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Sep 8, 2011
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Hello

I am trying to release the imprisoned 3.9 Horses in my 6hp Mariner. I already found out, that the 9.9 has an exhaust-tube and the 6 and 8hp not, which would partially explain the oil that comes out of the 2 small exhaust-holes at the back of the drive-housing right beneath the powerhead. This will be "fixed" this winter.
What i need now, is the diameter of the carburetor and the main-jet, as well as the idle-jet. Sadly, i cannot find any information on the internet and i don't want to base my modifications on some formulas for little 2-Stroke Engines used in High-RPM Motorcycle-Engines.
Could someone tell me the dimensions of the carb of the 209ccm 9.9HP Mariner/Mercury-Engines, that were built from 1987 to ca. 1998?
Thanks in advance

Greetings
Thorsten

Edit: Beside the Carb-Diameter, the Main-Jet and the addition of an Exhaust-Tube in the Driveshaft-Housing, is there another difference between the 6, 8 and 9.9HP Engines?
 

SaabFAN

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Re: Technical Data of Mariner 9.9HP 209ccm 2-Stroke Carb for the purpose of tuning a

I already did that.
The problem ist, that these part-lists do not list the diameter of the venturi of the different carburetor-assemblys. And a google-search for the carbs in the part-lists doesn't give me the diameter either. And so does the service-manual...
I could of course guess the diameter of the venturi based on the current diameter and the factor of the main-jet diameter-increase from 6 to 9.9hp.
But i would prefer to base my carb-modifications on the actual dimensions of the 9.9 Carb, which costs about 180 Euros here in germany.
 

SaabFAN

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Re: Technical Data of Mariner 9.9HP 209ccm 2-Stroke Carb for the purpose of tuning a

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