Carb set up for K & N's

Steve K · #1 PostAuthor: **Steve K** » Tue Apr 17, 2007 8:12 pm

Just bought a '77 Z900 fitted with K & N air filters, but it's not set up correctly.
Does anybody know what main jet size & needle setting would be needed.

Cheers
Steve K
Oh' it's also running a 4 into 1 if that makes any difference

uk kev · #2 PostAuthor: **uk kev** » Tue Apr 17, 2007 8:18 pm

Hi Steve, I was advised to increase the mains by 10% if using pod filters, I asked this same question earlier this week.

Pigford · #3 PostAuthor: **Pigford** » Tue Apr 17, 2007 8:22 pm

Steve K, yeeh, +10% (so about 125/130) as a start point. This may err on the rich side, but better that then weak :!:

As for the needles, these will effect 1/4 to 1/2 throttle mixture. Do mains first then start fine tuning with needles after mains are OK. :wink:

Some say the standard carbs are a pain to set up when mucking around with hi-flo filters

Personally I run Mikuni RS flatslides, as they're good to tune, relatively cheap and offer good performance upgrade. Good luck :shock:

Steve K · #4 PostAuthor: **Steve K** » Tue Apr 17, 2007 8:26 pm

Great help, cheers guys

Steve K

uk kev · #5 PostAuthor: **uk kev** » Tue Apr 17, 2007 8:27 pm

This was to be my next question on the other thread, but I will ask here as this one is current.
Where do you get the larger 125 mains from?

Rich · #6 PostAuthor: **Rich** » Tue Apr 17, 2007 8:31 pm

Just ring round your local bike shops and see who has Mikuni lets in. You want the round head ones.

Steve K · #7 PostAuthor: **Steve K** » Tue Apr 17, 2007 8:32 pm

Uk Kev- your local Kwacka dealer should be able get these

Pigford · #8 PostAuthor: **Pigford** » Wed Apr 18, 2007 8:25 pm

Make sure you get the large round slotted jets, not smaller hex head ones.
In fact I got some u can have :wink:

PM me ur address UK Kev

Davy Doherty · #9 PostAuthor: **Davy Doherty** » Wed Apr 18, 2007 8:34 pm

Yet another helpfull Zed head, well done Pigford :wink:

Pigford · #10 PostAuthor: **Pigford** » Wed Apr 18, 2007 8:45 pm

Davy, don't 'big me up' too much, they're only old tatty ones, i've got dozens from me youth when I use to faff around with 2-strokes

Wouldn't get much for em on eBay anyhow

uk kev · #11 PostAuthor: **uk kev** » Wed Apr 18, 2007 9:07 pm

Pigford wrote:In fact I got some u can have
PM me ur address UK Kev

Thanks so much.
Fantastic.
Kev.

uk kev · #12 PostAuthor: **uk kev** » Fri Apr 20, 2007 9:08 am

Pigford wrote:Make sure you get the large round slotted jets, not smaller hex head ones.
In fact I got some u can have
PM me ur address UK Kev

And they arrived today, thanks again Mark.

Pigford · #13 PostAuthor: **Pigford** » Fri Apr 20, 2007 7:20 pm

My pleasure UK Kev, now the REAL fun begins

uk kev · #14 PostAuthor: **uk kev** » Sat Apr 21, 2007 2:55 pm

In continuing with the carb theme, on the bank of carbs, I have two fuel inlet stubs that connect to the fuel tap, one for the left bank of carbs, the other for the right bank, then I also have two vacuum stubs, one on each bank again, (A) & (B) now (A) connects to the vacuum stub on the fuel tap, but where does (B) go?

Pigford · #15 PostAuthor: **Pigford** » Sat Apr 21, 2007 4:35 pm

Just blank the one furthest from the fuel tap :!:

Its just easier for Mikuni to produce 'em like that.

Carb set up for K & N's

Carb set up for K & N's

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