KZ 900 A4 Valve Clearances

  • Summerheat
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21 Jul 2009 05:11 - 21 Jul 2009 05:12 #308388 by Summerheat
KZ 900 A4 Valve Clearances was created by Summerheat
Getting ready to shim valve clearance into spec, but confused on what spec that is. Have heard varying input on what to shoot for...

Any input will be greatly appreciated.

All 4 intakes are currently .051 (a couple are loose .051's)

#2&3 exhaust are .051 and #1&4 are .000

Pulling shims tonight to identify what is in there and what I need to get. But what am I really shooting for??? Between .10 and .15 ????
1976 KZ900-A4
Last edit: 21 Jul 2009 05:12 by Summerheat.

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21 Jul 2009 05:18 - 21 Jul 2009 05:25 #308390 by Old Man Rock
Replied by Old Man Rock on topic KZ 900 A4 Valve Clearances
Follow the instructions on the sheet.... Lower right hand corner... Click on the image to enlarge... Or right click on the image to save to your computer...

Spec is .002" - .004" (.05mm - .10mm)

Try to shoot for .004" on intake and .004" - .006" on exhaust. You want the exhaust a thou or two looser than the intakes...

836
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: 21 Jul 2009 05:25 by Old Man Rock.

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21 Jul 2009 05:24 #308392 by Patton
Replied by Patton on topic KZ 900 A4 Valve Clearances
Summerheat wrote:

Getting ready to shim valve clearance into spec, but confused on what spec that is. Have heard varying input on what to shoot for...

Any input will be greatly appreciated.

All 4 intakes are currently .051 (a couple are loose .051's)

#2&3 exhaust are .051 and #1&4 are .000

Pulling shims tonight to identify what is in there and what I need to get. But what am I really shooting for??? Between .10 and .15 ????



FSM specifies .05~.10 mm (.002~.004 inch).

Good Luck! :)
1973 Z1
KZ900 LTD

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  • Summerheat
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22 Jul 2009 09:46 #308662 by Summerheat
Replied by Summerheat on topic KZ 900 A4 Valve Clearances
Thanks for the chart but I believe it confused me more :) So to clerify I am ordering correctly.

Examples: Intake is .051 with a 260 shim
Exhaust is .000 with a 260 shim

Order a 255 intake to increase clearance to .10
Order a 250 exhaust to increase clearance to .10

When I look at that chart it looks as if I am buying bigger shim which would decrease my clearance.
1976 KZ900-A4

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  • DoubleDub
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22 Jul 2009 10:21 - 22 Jul 2009 14:29 #308669 by DoubleDub
Replied by DoubleDub on topic KZ 900 A4 Valve Clearances
The chart assumes wear which (I believe) should mean that your clearances increase and therefore would require larger shims. So with an existing 2.60 shim and .051 clearance it is reading as within the spec range.

You can't really do a chart for no clearance (your 0.00 clearance) since you have to adjust to a smaller shim before you are able to measure the needed clearance.

It sounds like a place to start, you may have to order again depending on the actual clearance needs of the ones with a 0.00 reading currently.
Last edit: 22 Jul 2009 14:29 by DoubleDub.

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