Carb size for 4 stroke

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curtisfox

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Dec 29, 2008
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I have a Lauson 2 hp engine ( like a old Briggs ) 3/4" hole, just wondering what size NT carb should i run on it? It has a tillotson on there now, and thought i would go for motorcycle look with NT.....................Curt
 
cannonball2

cannonball2

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Oct 28, 2010
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Curt, if you are talking the common CG NT then the 66cc would be it. I assume the jetting would have to be enlarged. The carb for a Honda Cub Clone engine would also work I believe Maybe one for a 125cc? That should be in the general range of CCs for the Lauson.

I am running the NT on my 2cylinder Maytag and at the rpms it makes I guessing its around 2hp. Going up a few jet sizes was all it took.
 
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curtisfox

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Thanks! CB I should of said how big do I dear go? Kind of thinking Mikuni , but just investagating now. ..........Curt
 
Tony01

Tony01

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Nov 28, 2012
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I'd run the carb I'm running now, the adjustable jet carb from the Tecumseh H35. if the 2hp is similar to the briggs then the tec intake manifold will bolt right on with 5min of grinding the holes. Adjustable main jet!! And they are only around $15 a piece. Believe me you WANT adjustable jets!

Carb
http://m.ebay.com/itm/Brand-New-Eng...-H50-H60-HH60-632230-/262236414269?nav=SEARCH

Intake manifold
http://m.ebay.com/itm/Tecumseh-intake-pipe-28416A-H30-H35-HXL35-HSK40-HSK35-/390185601384?nav=SEARCH

For my 3.5hp the needle settings are main 3/4 turn out, idle 1 turn out.

Reason I say it's good is cause it feels a bit small for my engine, it's got a Venturi size of around 12mm. I'd like to upgrade to a larger carb maybe 19 or 20mm.
 
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curtisfox

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Dec 29, 2008
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Kool beginner01 , ya that's all I ever monkeyed with is adjustable carbs. I know on a Kohler 12&14 hp the only difference is the carb, 14 ihas aa bigger venture. Thanks ............Curt
 
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curtisfox

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Dec 29, 2008
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KOOL! I looked at the stock carb and the venture is only about 1/2" small. That's a neat link with the adjustable fuel screw, thanks. I will do some more snooping and wait for more ideas this week.......................Curt
 
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curtisfox

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I have a old Carter 20 mm THANKS to msrfan. i am going to try it first then see what happens........................Curt
 
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curtisfox

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Dec 29, 2008
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Tony01 said:
I'd run the carb I'm running now, the adjustable jet carb from the Tecumseh H35. if the 2hp is similar to the briggs then the tec intake manifold will bolt right on with 5min of grinding the holes. Adjustable main jet!! And they are only around $15 a piece. Believe me you WANT adjustable jets!

Carb
http://m.ebay.com/itm/Brand-New-Eng...-H50-H60-HH60-632230-/262236414269?nav=SEARCH

Intake manifold
http://m.ebay.com/itm/Tecumseh-intake-pipe-28416A-H30-H35-HXL35-HSK40-HSK35-/390185601384?nav=SEARCH

For my 3.5hp the needle settings are main 3/4 turn out, idle 1 turn out.

Reason I say it's good is cause it feels a bit small for my engine, it's got a Venturi size of around 12mm. I'd like to upgrade to a larger carb maybe 19 or 20mm.
Click to expand...
Was going to by but all sold out, can't beat the price. Stick a couple on the shelf for that price....LOL..............Curt
 
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