Stock cam lift?

spdygon
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17 Aug 2015 13:54 - 17 Aug 2015 13:56 #686109 by spdygon

Stock cam lift? was created by spdygon

Helping a friend out. Bike has 16k plus miles. We were checking the valve clearance and found all but one at .006 to .007.
We know they should be between.002 and .004.
He measured the cam lope and the it measure 362mm.
Is 362 the original cam lift?
My 79 kz1000 had z4 cams and it required.004 to .006 valve clearance.
So either he has after market cams or his cams are worn out.
Thoughts? His bike is a 78kz1000

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

Last edit: 17 Aug 2015 13:56 by spdygon.

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OnkelB
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17 Aug 2015 15:05 - 17 Aug 2015 15:20 #686119 by OnkelB

Replied by OnkelB on topic Stock cam lift?

spdygon wrote: .
...He measured the cam lope and the it measure 362mm...

Umm, I think you mean 36.2 mm - 362 mm = 36.2 cm which is more than a foot long (1 foot = 304.8 mm/30.48 cm).

Is 362 the original cam lift?...

No, neither is 36.2. Measure the base circle, perpendicular to the lobe center line, then subtract that measure from the lobe heel-to-nose measure you already took (36.2 mm), the result is the lift.

77 KZ 650 B1, 82 GPz 1100 B2.

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Last edit: 17 Aug 2015 15:20 by OnkelB.

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650ed
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17 Aug 2015 15:41 #686121 by 650ed

Replied by 650ed on topic Stock cam lift?

You state "We know they should be between.002 and .004."

Where did you come up with that specification? The KZ1000 Kawasaki Service Manual I have access to shows 0.05mm - 0.15mm which equals 0.002" - 0.006" Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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racer54
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17 Aug 2015 16:03 #686123 by racer54

Replied by racer54 on topic Stock cam lift?

Don't know exact lift figures but cam lift on these motors are around .300-.325 lift.

1980 LTD (changed over the years), 1979 LTD (being rebuilt), 1977 KZ turbo and various KZ's in various states of build. KLX110

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spdygon
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17 Aug 2015 16:03 - 17 Aug 2015 16:05 #686124 by spdygon

Replied by spdygon on topic Stock cam lift?

I'll check again but my says
002 to 004 of an inch
.005 to .010 mm
Sorry...measurements are 006 and 007 of an inch

Last edit: 17 Aug 2015 16:05 by spdygon.

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650ed
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17 Aug 2015 16:27 #686125 by 650ed

Replied by 650ed on topic Stock cam lift?

Here's the table from the manual I have. The manual covers the 1981 - 1983 models, but I wouldn't have thought the 1978 models would have specs that were much different. Ed

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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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SWest
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10 22 2014

17 Aug 2015 16:40 #686126 by SWest

Replied by SWest on topic Stock cam lift?

I just checked a old Z1 900 cam and it measures 36.38mm from nose to base.
Steve

Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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spdygon
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17 Aug 2015 17:27 #686130 by spdygon

Replied by spdygon on topic Stock cam lift?

ok
he has stock cams....Intake is 36.22 Exhaust is 35.55
so safe to assume that his cams are worn out at the base?
Or what else would cause loose valve clearances?
Normally valves get tight.

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SWest
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10 22 2014

17 Aug 2015 18:12 #686139 by SWest

Replied by SWest on topic Stock cam lift?

Cam bearings?
Steve

Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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missionkz
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17 Aug 2015 18:25 #686141 by missionkz

Replied by missionkz on topic Stock cam lift?

I just measured my extra set of KZ1000a cams, with about 15,000 miles on them:
Intake> 36.36mm x 28.30mm = 8.06mm lift, or .317"
Exhaust> 35.85mm x 28.18mm = 7.65mm lift, or .301"

Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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650ed
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17 Aug 2015 18:40 #686143 by 650ed

Replied by 650ed on topic Stock cam lift?

spdygon wrote: ok
he has stock cams....Intake is 36.22 Exhaust is 35.55
so safe to assume that his cams are worn out at the base?
Or what else would cause loose valve clearances?
Normally valves get tight.

No, the base should not be worn out. Nothing rubs on the base (that's why clearance is measured at the base), so it should not wear at all. Of course, if the owner has the valves so tight that there is zero clearance all bets are off, but that does not sound like it is the case here.

Valves do not always get tighter. I have had them vary a little both tighter and looser. Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Nessism
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17 Aug 2015 19:22 #686150 by Nessism

Replied by Nessism on topic Stock cam lift?

Valves almost always get tighter. Maybe someone that didn't know what they are doing changed the shims?

Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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Stock cam lift?

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