Topic: jetting carb

[Johnson Mowersports]

Ok I have to rejet my carb on my fc420 its running really lean I have a big uni filter on it it has stock size jets but I don't know what jet to drill any help would be highly appreciated

[Johnson Mowersports]

Is it the  little jet that goes in the bowl screw?

[GRUBDIGGER]

I WOULD TELL YA MAKE IT ONE SIZE LARGER. KEEP DOING THIS TILL YOU GET WHAT YOU NEED. 1-2 SIZES LARGER SHOULD DO IT.

[Johnson Mowersports]

ok is that the right jet the little bitty one that screws into the bowl screw not the emulsion jet.

[GRUBDIGGER]

WELL YOU COULD HAVE ONE OF TWO. THE HIGH SPEED JET IS EITHER ON THE SIDE OF THE EMULSION TUBE OR IN THE CENTER OF THE TUBE. WICH EVER ONE YOU HAVE IT WILL NEED DRILLING. AND YES WHERE THE BOWL NUT SCREWS INTO.

[Johnson Mowersports]

I hope I do the right one is thee a pic of one so I know for sure I can't post pics on here with my phone

[GRUBDIGGER]

WHEN YOU TOOK OFF THE BOWL, WAS THERE SOMETHING BRASS LOOKING  ON THE SIDE OF THE CARB WHERE THE BOWL NUT SCREWS INTO? IF YES, THAT IS YOUR HIGH SPEED JET.

IF NOT THEN THE JET IS IN THE CENTER OF THE CARB WHERE YOUR BOWL NUT SCREWS INTO.

[Johnson Mowersports]

No there is a jet inside the bowl nut and the nut has holes in it to suck gas

[Johnson Mowersports]

Ok I opened up the jet its harder to start now but it runs good until u hold it wide open then it starts like its running out of gas I just can't figure it out

[Johnson Mowersports]

Also checked the plug after I rode it and its still white

[GRUBDIGGER]

DRILL ONE SIZE LARGER.

[Johnson Mowersports]

The one I used was 2 sizes larger

[Johnson Mowersports]

Ok everyone we ran the kaw Saturday ran strong but finished 5th due to the carb cutting out on top end and minor gearing problems this things racking my brain about looaing fuel on top end

[bountyhunter]

Are u using a fuel pump

Sent from my LG-VS700

[Johnson Mowersports]

Yes the motor came with a fuel pump  from the factory

Are u using a fuel pump

Sent from my LG-VS700