450 carburetor

robertw · Oct 30, 2016

Is there any difference between a 400 and a 450 carburetor on the inside and how do you tell the difference on the out side i know they have numbers on the out side this is the number i have for the 450 362173r92 not sure on the 400 and the number i have for the 450 I'm not sure? I have a m pulling tractor that i would like to putt a bigger carburetor on it i know the choke is on the in side on these and i was thinking the 450 would be the best one it has a lot of compression and lp manifold and was thinking the 450 carburetor would work the best can't seem to get a enough gas to it. i drilled out the jet on the stock one and the metering stem to.

Thanks Robertw

Oconnor · Oct 30, 2016

Look inside the throat, above the venturi. Count how many holes you see. If you see 3, rejoice. If you see two, then it's almost the same as the m, except the idle screw in a different location, and the metering stem will be the screw in type. Put a butterfly from a 806 in any of them, which requires boring the carb but best way to get carb ill bigger.

D Slater · Oct 30, 2016

Most 400 and 450 used the same carburetor, 362173R2. Early 400 had a 362173R1 that was metered a little different. There's a R3 also but never noticed a metering difference from a R2. Those numbers are for a gasoline carburetor only.

fastfarmall · Oct 30, 2016

Just my opinion but boring the throat of the carburetor, wouldn't do much good unless you bore out the corresponding throat on the intake manifold also.

Oconnor · Oct 30, 2016

Agreed. I doubt there be much of a hp gain.too big can hurt lug power. I would spend time on a dyno with an assortment of venturi sizes and just use the m carb. Just don't overdrill the holes in metering stem.

robertw · Oct 31, 2016

Thanks guys for the answers vary helpful.

Robertw

450 carburetor

robertw

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Oconnor

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D Slater

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fastfarmall

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Oconnor

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robertw

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