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Need some jetting suggestions.
- julio
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It wasn't running when I started. I did get it to fire up but I am waiting on some plug wires and I need to swap a couple of valve shims out before I mess with the carb some more.
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- bountyhunter
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Look up the stock jets for it, I suspect they are the 115 and 17.5 you have because those are the ones I remember. Mac headers are not known for great flow characteristics. Add pods and you might want to start with one size larger on the pilot and two sizes up on the mains, which would be 20 and 120. I would set the needles to the center notch for starters.
Bear in mind that's just a guess.
1979 KZ-750 Twin
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- keith1
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Maybe somebody who has done it before will chime in, but if not here's what I might try:
Look up the stock jets for it, I suspect they are the 115 and 17.5 you have because those are the ones I remember. Mac headers are not known for great flow characteristics. Add pods and you might want to start with one size larger on the pilot and two sizes up on the mains, which would be 20 and 120. I would set the needles to the center notch for starters.
Bear in mind that's just a guess.
i m no carb guru, but that sounds like an excellent place to start...if you have to adj from there, it wont take much...keith
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- Old Man Rock
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As Bounty mentioned, start with what you have (OEM stock jets), ride her and see where she presently lies in performance, throttle response, spark plug insulation and ring color, how does she idle, response in low-med-high rpm ranges etc...
Even with new Keihins, pods, 4-1 exhaust, head P&P you pretty much end up with 2 jet size changes on the Mains and pilots... A clip position here & there... It's been pretty much the same for all of us....
But keep in mind, all motors are different, intakes, vaccum pull, manifold no leaks, exhaust no leaks, head P&P, valve seal conditions and of course carb synch etc....
Then of course, whats the true condition of these 30 year old carbs of yours... You are rebuilding them with carb kits while you have them out right...
What worked for our motors may not work for you.... Close yes but dead on... no...
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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- julio
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The "home port job" looked like someones attempt at turning their set of 26's into a set of "29's". They took a dremel and removed material in front and behind the slides. On the back they actually flared them to a point where they meet the boot. They actually didn't do too bad for doing it by hand but there's no way they are right like this. I've seen this done before but you need to set them up on a machining center to do it right. I'm not even sure if these are good carbs to do this to in the first place.
I have torn the old carbs apart soaked and rebuilt them but just with the jets I alread have. They cleaned up pretty good.
I have another question I'll post in the engines forum about the web cams. The clearance varies quite a bit when you rotate them long before they begin to open or close. Makes it hard to decide what shims to use. Go by the smallest gap?? I've never run into any cams that were grouknd that "unround" on the back of the lobes.
Thanks again for the replies.
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- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- julio
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It sucks waiting for something as simple as a couple of shims and plug wires. I went an tried some local places but nothing is open today.
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- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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