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132.5 main jets 01 Oct 2014 14:44 #649332

  • Bama704
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I came home today and started taking apart the carbs on my 77 kz900, they need a good cleaning and while disassembling them I noticed that the mains were 132.5, what do you think the PO was thinking? I will be buying a few different mains to sample with since the PO left me with a cracked stock airbox. I think I will try the K&N RC-2222 dual pod setup, what jets should I try?
1977 KZ900
Carbs are late model 1975 28mm

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132.5 main jets 18 Nov 2014 11:06 #654051

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For a follow-up, I do not have the 26mm carbs, I have 28mm late model carbs. A while back I ordered the Carburetor kit from Z1 enterprises and replaced with the mains that came with the kit, 112.5. I still have the 132.5, and have not ordered any new mains yet from mikuni. I still want to order the K&N RC-2222 dual pod set up.

Anybody have any success with this? Think I will have to try 120 mains or perhaps 117.5,
1977 KZ900
Carbs are late model 1975 28mm
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132.5 main jets 18 Nov 2014 18:02 #654090

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A little more info on your bike would help like
stock motor ? what pipe your running.

On my GPz750 motor with VM29's I'm running 120 main's and 17.5 pilot's
but will be going to 20 pilot's but would think 132.5's with VM28 on a stock KZ900 motor
would be like using a garden hose for jet's.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63" wheel base.

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132.5 main jets 18 Nov 2014 18:16 #654093

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Yeah I am running a stock motor and have a kerker header on there. No muffler right now, need to order a new one, the previous one was rusted so I had to remove it. 132.5s seemed way too big IMO as well.
1977 KZ900
Carbs are late model 1975 28mm

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132.5 main jets 09 Dec 2014 18:12 #655733

  • Naranja
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It is worth looking at what type jets they are. Mikuni , Keihin, or Dynojet. All are different even with matching numbers. I was blasting around on my 79 KZ 1000 for ages before I opened it up and saw the PO was running .....140!
Yes, it ran like a monster. Low end good too. Pods, 4-1 pipes.

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132.5 main jets 09 Dec 2014 18:20 #655734

  • spdygon
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It also depends on what part of the country you live . The higher in elevation the more gas it will need .
1982 GS1000sz Katana ( #15...17K Miles)
1982 GS1000sz Katana ( # 297....7100k Miles)
1978 Kz1000 Z1R. 10K Miles1
1978 kz1000 z1r 27k miles
1977 KZ 1000 A ( Project ) 54K Miles
1976 Kz900A4 (Red)21K miles
1976 Kz900A4 ( Red)7500 miles
1974 Z1 900 project

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132.5 main jets 10 Dec 2014 16:20 #655797

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spdygon wrote: I The higher in elevation the more gas it will need .


The higher you get the less oxygen there is so you need to
take fuel away.

As for jetting I'd start with putting a megaphone pipe with a baffle
and the air filter's your going to run so it's set up like your gonna ride it.
Then I'd start with 15 pilot's and 117.5 main's and the needle in the third notch
and use that as a base line and change ONE thing at a time
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63" wheel base.

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Last edit: by zukdave.

132.5 main jets 10 Dec 2014 17:05 #655800

  • jakedude
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Bama704 wrote: I came home today and started taking apart the carbs on my 77 kz900, they need a good cleaning and while disassembling them I noticed that the mains were 132.5, what do you think the PO was thinking? I will be buying a few different mains to sample with since the PO left me with a cracked stock airbox. I think I will try the K&N RC-2222 dual pod setup, what jets should I try?


I would go to a site like...

www.ddsmotorsports.com/oempartfinder.htm

Enter the info for your bike. Find your carb. Find out what the stock jets were. That will give you a better starting place. Pods air filters will lean out your mixture so you will need to go bigger. When I switched my bike to pods I did my best to follow the instructions that came with the K & N pods. That wasn't so simple because the instructions were generic for all bikes and rather confusing. After reading those instructions several time I decided to increase both my main and slow speed jet by 15%. My plugs look good and I have good power so I'm happy.

One other thing to consider is that your air box also supports your carbs so you should fabricate some kind of support bracket.

Good luck.
Nothing lasts, nothing is finished, and nothing is perfect.
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132.5 main jets 11 Dec 2014 06:15 #655827

  • z1kzonly
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Main jet only works for full open throttle.
132's are way to big. If you have the later style 28's, they should have the accelerator pump. Those carbs came stock with 105's. that's why hey put the pump on for some help when you twisted open the throttle. Even back the the EPA regs. were starting to take control.
That was always the first mistake guys did back in the day. Buy a 4-1 header, put breadbox air cleaner or K/N's. Then the salesman told they needed bigger jets. Made more money off of them.
How about the clip position on the needle jet? there a 5 positions. You will get 20 opinions if you asked 20 people.
Only way to test is with a full throttle kill stop. Wide open. Then check the plugs.
Good luck. I always hated stock carbs, so did Kawasaki. that'swhy they always were changing them.
Best carbs were 76 26mm. For stock size engines. IMO.
Livin in "CheektaVegas, NY
Went thru 25 of these in 40 yrs.
I SOLD OUT! THE KAW BARN IS EMPTY.
More room for The Old Girl, Harley 75 FLH Electra Glide,
Old faithful! Points ign. Bendix Orig. carb.
Starts everytime!

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