Intake clearance

  • sbulla
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  • 1980 KZ1000 LTD
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11 May 2010 08:02 #367209 by sbulla
Intake clearance was created by sbulla
I know I'm probably getting a bit anal here but, which is better for an intake valve clearance .102mm or .152mm?

Numbers 2,3,4 all check at .127mm but number 1, with a 270 shim is .102mm and, with a 265 shim is .152mm.

I'd sure like to get them all the same. Wish they made a 267.5 shim. ;-)

Sonny
Now----
1980 KZ1000 LTD (Kerker 4-1, K&N pods, Dyna gray coils)


Gone but not forgotten----
1966 Honda 305 Superhawk
1969 HD 350 Sprint
1971 500 H1
1972 250 F8
1972 750 H2
1973 KX250
1995 HD Sportster 1200
2000 HD Softail
2002 KLR650

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11 May 2010 08:21 - 11 May 2010 08:25 #367212 by Old Man Rock
Replied by Old Man Rock on topic Intake clearance
"I know I'm probably getting a bit anal here"... Hey that's my title... :blush: You have no idea how anal I get... Ask Larry & Plumm... :laugh:

Due to performance build (compressions, cams and head) & heat, here's what I was taught...

Intakes @ .05 to .10mm
Exhaust @ .10 to .15mm

Due to heat, the exhaust clearance will shrink on you. Set between .1 - .15mm and shortly within running, she'll drop around the .10mm clearnace...;)

The intake will hold fairly steady so better at the lower clearance ~.10mm...

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
Last edit: 11 May 2010 08:25 by Old Man Rock.

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11 May 2010 08:31 #367215 by otakar
Replied by otakar on topic Intake clearance
Because the gaps will not get bigger but will get smaller in time, when in doubt I always go with the next size larger shim. The only side effects will be that you will have .05mm less lift and the valves might "hiss' a bit more. But it is true, on the exhaust you do want to go bigger on the intakes it will not be that critical. If you have under-bucket shims than definitely go with the larger gap. It is a lot of work to go threw to change them again.
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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11 May 2010 11:16 - 11 May 2010 11:24 #367237 by bountyhunter
Replied by bountyhunter on topic Intake clearance
sbulla wrote:

I know I'm probably getting a bit anal here but, which is better for an intake valve clearance .102mm or .152mm?

Numbers 2,3,4 all check at .127mm but number 1, with a 270 shim is .102mm and, with a 265 shim is .152mm.

I'd sure like to get them all the same. Wish they made a 267.5 shim. ;-)

Sonny

I'd never leave one at minimum clearance. A shade wide is no problem, too tight can burn a valve and ruin the valve seat. On mine, spec is .05 - .10 so I would think .102 would be OK but .15 is probably better.
1979 KZ-750 Twin
Last edit: 11 May 2010 11:24 by bountyhunter.

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  • 9am53
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  • homebrew, and some bbq
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11 May 2010 12:24 #367249 by 9am53
Replied by 9am53 on topic Intake clearance
Old Man Rock wrote:

You have no idea how anal I get... Ask Larry & Plumm...


hmm, so are you a tight end, or a wide reciever? :woohoo:
'84 GPz900r
'71 CB350


s289.photobucket.com/albums/ll231/9am53/

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