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i have a Briggs & Stratton 44N877-0003-G1 with the auto choke, so its not the 2 barrel carb, its the single barrel carb in it

i realized the main jet has fallen out so i used a spare from those standard carb rebuild kits for the 14-20hp single cylinder inteks

well the engine runs sorta as it should but clearly the jet is too small since at full throttle its only running like 1/4-1/3rd speed at best

i found another jet i dont know whats its from but it must have been a 20-21 hp since you can see the hole is noticeably larger so i'll try that in it when i get a chance.

my question is, if anyone knows, since i have at least 2 different size jets, how many different standard sized jets are there?

im assuming that the small jet size was for 14-17 hp and the larger jet size would be for the 18-21 hp but would that be enough flow for a twin cylinder engine?

Lots of different jets for the NIkki out there. Since I haven't use the 842585 jet I don't have it size in front of me but if I ever do I add it to my PN to Jet size chart. I do know that the high altitude jet (792296) is 1.18mm and that the 842585 would be a few hundredths of a millimeter larger.

StarTech said:

Lots of different jets for the NIkki out there. Since I haven't use the 842585 jet I don't have it size in front of me but if I ever do I add it to my PN to Jet size chart. I do know that the high altitude jet (792296) is 1.18mm and that the 842585 would be a few hundredths of a millimeter larger.

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ya, im trying to avoid spending $25 to buy a new jet for it. it would literally hurt if i had to spend that kinda money on something the size of a single pellet

i will hope the larger one i have makes it run as it should, if not i may try drilling it out (since i have several spares) before buying a new one

i know i cant see good but for the life of me i see no size or code markings on the jet

Some don't have markings. The cost of the jets is why I try not to lose them as I rather replace the o-ring than the jet but I have blown them away a few times. Even here they are $10-$13 each before shipping.

At least you know what the high altitude size is now.

StarTech said:

Some don't have markings. The cost of the jets is why I try not to lose them as I rather replace the o-ring than the jet but I have blown them away a few times. Even here they are $10-$13 each before shipping.

At least you know what the high altitude size is now.

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ok, at least i know now im not seeing it because it may not have one lol

there are just no carburetor kits for this engine and im not keen on buying a $200 carb

i'll try the jet i found that has a bigger hole and see what happens and if thats not enough, i'll break out the drill bits and make my own jet

You don't really need a kit as most times all I need is a bowl gasket, a jet o-ring, and maybe a new needle valve. As for the foam seals I make my own. The paper gaskets usually make it though the cleaning process here.

But there is a carburetor kit for this carburetor. The previous PN 594212 is superseded to 84001917. Just Google the part number and you will see the ridiculous prices some vendors are wanting but is one of the lowest.

briggs-stratton-84001917-kit-carburetor-overhaul

keakar, line one is your engines illustrated parts breakdown, lines two & three are the main jets you need for your carburetor.

This kit fixes about 75% of carb problems for these carbs.
Full kit

Hammer those kits will not work on the engine in question as it has an one barrel carburetor and those are for a twin barrel.

You might need to reread post #1.

Yeah you are right. Saw the engine number but didn't see the o e barrell thing. My bad please disregard. First mistake of the day. Only 10 more to go.

ok the jets i had from the carb rebuild kits were small and the one i used in the carb was a little larger then those but the one i found with the bigger hole was just a tad bigger then the other one so i used that and it seems to run pretty good now.

but i dont think it still has full throttle. it just seems too quiet and rpms are lower then i would expect but its hard to tell and it seems good and strong and no longer struggles when blades are engaged like with the medium sized jet.

if i had to guess i would say it maybe runs about 2/3rds rpms that i would expect it to at the fast throttle setting now. but then its fairly new and being a twin maybe it is just a very quiet engine

im gonna call it fixed at this point and if she struggles in tall grass then i will bit the bullet and just buy the $25 jet for it

end result working on this mower is

- the governor arm needed replacing

- someone took the carb apart and lost the main jet and put it back together like that blowing up the in the process

- they also lost the bolts for the intake manifold so i had to dig through my spare bolts bucket to find the right length ones for it

- the cooling fan was busted up because the cover was loose with half the bolts missing on it so i had to dig through my spare bolts bucket to find them

all this on a 3yr old lawnmower but its all fixed the right way now, with the possible exception of the questionable jet issue

Hammermechanicman said:

Yeah you are right. Saw the engine number but didn't see the o e barrell thing. My bad please disregard. First mistake of the day. Only 10 more to go.

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its cool, it is and easy mistake to make since its very unusual as far as i know for a twin to have a single barrel manifold and carb

the twin carbs can be bought brand new for only $25 and once and a while i have to swap out the old choke arms so the linkages match but otherwise they are very good carbs