not sure what kind of carbs i have need help

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29 Dec 2011 20:51 #495211 by andler2008
not sure what kind of carbs i have need help was created by andler2008
i have a 1981 kz1000 CSR. i looked on Z1E and the rebuild kit for these carbs state it comes with 122.5 main jets. well the jets i took out are 107.5. the pilots are 7.5. does anyone happen to know what kind these are?
1980 KZ 1075
Mods? Pshh I have no idea right now

1981 Kz1000 CSR - Sold
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29 Dec 2011 21:05 - 29 Dec 2011 21:05 #495214 by Old Man Rock
Replied by Old Man Rock on topic not sure what kind of carbs i have need help
BS-34's...

Go here for FREE OEM Service Manual... 1981-1983 KZ1000/1100 Service Manual

OMR

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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Last edit: 29 Dec 2011 21:05 by Old Man Rock.
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29 Dec 2011 21:56 #495215 by andler2008
Replied by andler2008 on topic not sure what kind of carbs i have need help
okayt yeah that's definately them. is 107.5 for the main and 7.5 for pilot the right size for stock jetting? i thought it was a lot higher than that.
1980 KZ 1075
Mods? Pshh I have no idea right now

1981 Kz1000 CSR - Sold

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30 Dec 2011 01:43 #495247 by roy-b-boy-b
Replied by roy-b-boy-b on topic not sure what kind of carbs i have need help
What are they? 34's? Jet them 40/140. Roy
1979 LTD Street Fighter.1977 KZ1000

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30 Dec 2011 06:40 #495258 by andler2008
Replied by andler2008 on topic not sure what kind of carbs i have need help
Yeah I saw on another thread that thats a good jetting for these carbs with the light mods I have. But I just thought that that would be too much. Is that keihin jets or mikuni?
1980 KZ 1075
Mods? Pshh I have no idea right now

1981 Kz1000 CSR - Sold

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30 Dec 2011 10:52 #495270 by roy-b-boy-b
Replied by roy-b-boy-b on topic not sure what kind of carbs i have need help
Are they Mikunis? Roy
1979 LTD Street Fighter.1977 KZ1000

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30 Dec 2011 11:07 #495272 by Old Man Rock
Replied by Old Man Rock on topic not sure what kind of carbs i have need help
Keep in mind, they would have been re-jetted pending exhaust, elevations, temperatures, pods vs air box, performance engine build etc....

What do your plugs look like (carbon/sooted = Rich, white = Lean, speckled = pre detonation)?

Exhaust back firing on deceleration, lag on acceleration or surging?
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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30 Dec 2011 17:01 #495320 by andler2008
Replied by andler2008 on topic not sure what kind of carbs i have need help
Generally I would rejet on any occasion of modification. The PO didnt rejet when he put pipe and pods on though. So I'm assuming this is where the terrible backfire on deceleration is.
1980 KZ 1075
Mods? Pshh I have no idea right now

1981 Kz1000 CSR - Sold

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30 Dec 2011 17:14 #495321 by Kawickrice
Replied by Kawickrice on topic not sure what kind of carbs i have need help
Backfire on deceleration can also be cracked carb boots that mount between the head and carbs. Check for any cracks in the rubber. If cracked and dryrotted it can leak and cause backfiring.

It could be a number of things including jetting
73 Kawasaki Z1
07 HD CVO Ultra Classic
82 Suzuki GS 1100
74 Yamaha RD 350 (My two stroke toy)
77 Kawasaki KZ 650B-1 (My putt around bike)
80 Indian Moped (My American Iron)
1
Long Gone
75 Suzuki GT550
74 GT 380
79 RD 400 Daytona Special
72 Honda CL 175
74 Honda QA 50
Tampa FL

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30 Dec 2011 17:14 - 30 Dec 2011 17:14 #495322 by etbike3135
Replied by etbike3135 on topic not sure what kind of carbs i have need help

andler2008 wrote: okayt yeah that's definately them. is 107.5 for the main and 7.5 for pilot the right size for stock jetting? i thought it was a lot higher than that.


I dont think your reading the pilot right, its 37.5

Where do you guys get the 40 pilot from?
1973 Kawasaki Z1
18 years in dragbikes
Last edit: 30 Dec 2011 17:14 by etbike3135.

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30 Dec 2011 17:20 - 30 Dec 2011 17:22 #495323 by loudhvx
Replied by loudhvx on topic not sure what kind of carbs i have need help
Really big bangs on deceleration can also be the air suction system malfunctioning. It's the big contraption on top of the motor. It feeds airbox air into the exhaust system through the valve cover.

If you bike has that (U.S. bikes did, Canadian did not), try connecting the valve cover ports to each other, or just cap them off. Cap off any vacuum line going to the diaphragm valve mechanism too.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Last edit: 30 Dec 2011 17:22 by loudhvx.

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30 Dec 2011 17:36 #495324 by andler2008
Replied by andler2008 on topic not sure what kind of carbs i have need help
Okay your right the pilot jet I took out is a 37.5. With that being said should I still net it from 107.5/37.5 to 140/40?

And The ports on the air suction system has been blocked off on carbs and valve cover.
1980 KZ 1075
Mods? Pshh I have no idea right now

1981 Kz1000 CSR - Sold

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