everyone that runs mikuni 44phh post your engine set up (stock/street port) and jetting.
i have an unknown setup with the top two 57.5, the lower ones 04, and the ones inside the 04's are 30. anyone have a guess stock or street?
if its street i need help finding jets for stock setup.

 

The 57.5s are your pilot jets, which is what I have in one set up for a GSL-SE. The 12A has 52.5 The rest of you #s are off, they should be 3 digits on the jets themselves . Pull the jet block out, the large pair and check the #s on the bottom jets too.

 

the big ones say 200 on the bottom.
the ones inside those say 30.

so with the 57.5 its probably setup for a 12a street port.
thats what the guy that sold it to me thought, but i wanted to make sure.

anyone have some spare jets they want to sell?

 

Call Wolfcreek Racing 516-635-6775.... He Has Mostly All The Jets In Stock.... I Just Bought Like $80.00 Worth Of Jets From Him.....

And I Think You're Still Off On The Jet ###

 

^^ hey scott,
i need to set this thing up for a stock 12a. could you tell me how the 52.5 carb is all jetted, like what jets i need to order from the guy in the above post?

 

wow, that is a great site.
what are people talking about when they say mikuni stuff is hard to find?!@?

 

The 2 carbs I have are for a 12A and 13B SE The jet #s for both are listed 12A/13B below. The starter jet is a 760 in both of them.

The large tube you took out is the jet block. The jet in the top is the main air jet 190/240, the one at the bottom of the jet block is the main fuel jet 200/175. Pilot jet 52.5/57.5.

The pilot jets fuel the carb from idle to about 20% throttle, then the mains take over.

I've been playing with the listed jets in the bp and have had afrs as low as 10. I can't really tune the carb until I get the exhaust redone and opened up.

 

main air jet -230
main fuel jet- 200
pilot jet ---57.5
are the jets i have. street port setup.

i need to set it for stock port. any suggestions?

 

First suggestion is to install it and see how it runs. That will give you an idea of what needs to be changed. It will probably run, even with those jets, how well is another question. If you have access to a wideband, that will make tuning easier.

 

did a search and this was what was most popular for a stock setup.
39mm venturi
pilot 62.5
air 240
fuel 200
pump jets 90
choke 760
where are the pump and choke jets located?

 

wtf are the pump jets?

 

Choke is the starter jet, it is under the big cover. Pumps are on each side of the starter lever, one is right next to the vacuum tube that comes out of the top.

 

awesome. thanks.

 

I have a handful of Mikuni jets just sitting here, not sure of the sizes but I can find out.

 

12a
Venturi 39mm
main fuel #200 jet
main air #240
pilot jet #62.5
accel pump #90 aka idle jet
jet block OA

13b
Venturi 39mm
main fuel #240 jet
main air #180 or 190
pilot jet #62.5
accel pump #90 aka idle jet
jet block OA

these are for stock or mildly ported engines with race exhaust

 

i wanna get in on the question asking. im gonna either street port or maybe even race port my 12a and wanna know what size air and fuel jets ill need to get? ive never been up to date on carb info, so any help would be great! also will have rb exhaust and headers, presilencer, and a few ignition mods. thanks

also i dunno if i missed it on the last page or not, but does anyone have the stock mikuni 44 jet sizes? i wanna see how much of difference in jet size there will be.

 

Okay, didn't want to start another thread, so I'll post here. I need some jetting reccomendations for the following setup:

44PHH
12a
big-*** street port, like, you can't go any bigger
RB headers
RB full exhaust
Comp 70 FP

Anybody who's run such a set-up, please tell what worked best for you