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Adjustable main fuel jet.

M

Mr. Farmall

Member
I am thinking about replacing the fixed main jet in my A "s carburetor with an adjustable one. The reason for this is a I do not think the compression is high enough to properly burn the 10% ethanol in modern gas. Most of the good carburetor rebuilders recommend setting carburetors 10% richer than stock to prevent a power decrease.

Any one else install an adjustable jet to offset the "leaner " E10 gas? Is their a slightly richer fixed main jet I could install? So far I have had to set the float level a little higher than factory because the motor starves for fuel under high load with the stock float level.
 
Ive been using the 10% blend for thirty pluss yrs in tractor rides,plowing gardens,cultivating,mowing yards and parades and you dont need to adjust anything just use and enjoy octane is higher and never anyproblems with moisture it just works.
 
(quoted from post at 10:39:26 08/22/12) I am thinking about replacing the fixed main jet in my A "s carburetor with an adjustable one. The reason for this is a I do not think the compression is high enough to properly burn the 10% ethanol in modern gas. Most of the good carburetor rebuilders recommend setting carburetors 10% richer than stock to prevent a power decrease.

Any one else install an adjustable jet to offset the "leaner " E10 gas? Is their a slightly richer fixed main jet I could install? So far I have had to set the float level a little higher than factory because the motor starves for fuel under high load with the stock float level.
Click to expand...

The adjustable jet does not replace the fixed main jet. It only allows you to decrease the amount of gasoline passing through it, and thus will provide a means of "leaning" down the fuel mix, but does not provide a means of "richening" the fuel mix.

I suppose you COULD drill out the fixed main jet slightly, and then use the adjustable jet to dial in the optimum fuel mix.
 
My SC & grandson's C run just fine on 10% ethanol blended fuel and have done so for many years. I think you are worrying about a "non-problem" here.
IF, and a BIG IF, your engine was a high performance raceing engine, then you may need to adjust fuel delivery but the average farm tractor engine is not that fussy.
 
(quoted from post at 12:05:13 08/22/12) My SC & grandson's C run just fine on 10% ethanol blended fuel and have done so for many years. I think you are worrying about a "non-problem" here.
IF, and a BIG IF, your engine was a high performance raceing engine, then you may need to adjust fuel delivery but the average farm tractor engine is not that fussy.
Click to expand...

Correct. The E10 has never caused any issues, performance or otherwise for me. E85, on the other hand, does require opening up that main jet a full 5 turns out.
 
I have not seen any problem with it on my BA which has a B engine and a A rear end so the engine is the same as the one in your A and it runs just crap gas just fine. Use the BA this spring to cut my hay
 
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