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Replacing Valve Stem Seals without pulling head 04 Jul 2011 02:03 #460879

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Valves fit snuggly in guides.

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Replacing Valve Stem Seals without pulling head 04 Jul 2011 02:21 #460882

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thats my simple,non scientific valve guide test! :woohoo:
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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Replacing Valve Stem Seals without pulling head 04 Jul 2011 12:23 #460936

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I've participated in a couple of seal changes with the head on.Drill out and modify an old spark plug so you can hook up your air line and thread in with pressure at 100# plus. This will hold the valves open, you 'll need a spring compressor and a flat bar for leverage to depress springs and remove keepers - we used a tire spoon with a bolt running through the handle attached to one of the rocker cover holes. Not easy, not for a novice and it's really a good idea to have 2 people on it.
79 KZ 1075 MKll
79 KZ 1500 MKll dragbike
Gone but not forgotten:
3 X 73 Z1's
1 X 74 Z1A
1 X 75 Z1B

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Replacing Valve Stem Seals without pulling head 04 Jul 2011 12:48 #460939

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In reading through this I just can't keeping thinking Oh KZ God Why (W/o Pulling Head)?

In a race where time is everything I get it but first attempt, new to the process, learning curve etc... other then the $50 head gasket replacement costs WHY keeps coming to mind... :dry: Not to mention you'll get a better look at the other valve components for inspection/replacements.

Ah well, I guess I'm just getting old.... :blush:
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: by Old Man Rock.

Replacing Valve Stem Seals without pulling head 04 Jul 2011 13:54 #460951

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In reading through this I just can't keeping thinking Oh KZ God Why (W/o Pulling Head)?

In a race where time is everything I get it but first attempt, new to the process, learning curve etc... other then the $50 head gasket replacement costs WHY keeps coming to mind... :dry: Not to mention you'll get a better look at the other valve components for inspection/replacements.

Ah well, I guess I'm just getting old.... :blush:


:laugh: :laugh: OMR, you are evil. :laugh: $50 gasket is just the beginning. One look at the valves, etc. and it's "Oh well, I may as well send the head off to be rebuilt." Then it's "well, what the heck, while I'm waiting for the head to be done I may as well have the cylinders honed - no better yet, replace them with a big block." Then "You know, a set of 29mm smoothbores would go nice with the additional displacement and the port job." Then "May as well back cut the tranny while I'm at it. Oh, and maybe a hydraulic dry clutch and air shifter." Then "Wow with all that extra power an extended swingarm and wider wheels and tires make sense." Then "Gotta be able to stop this beast, so 6 piston radial calipers are a must; but they would look better with USD forks." Then "These handlebars and seat look funky on such a performance bike; and how can I run this big engine without an oil cooler and dryblocking?" "Turbo & NOS would really make her pop."

The way I see it, pulling the head will cost at least ten to fifteen grand. It might be cheaper to buy an oil well and let 'er smoke. :laugh:
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Replacing Valve Stem Seals without pulling head 04 Jul 2011 14:00 #460952

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Now Ed be nice or I'll have to Photo chop your old ass.... :evil: :laugh: :laugh: :laugh:

As far as going crazy in $$$$... Well ya :pinch: .... :blush: :huh: :dry: :unsure: :blink: :laugh:
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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Replacing Valve Stem Seals without pulling head 04 Jul 2011 14:20 #460957

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I apologize. Maybe just substitute the coil mod for all that other stuff I mentioned. :)
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Replacing Valve Stem Seals without pulling head 04 Jul 2011 15:58 #460973

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I apologize. Maybe just substitute the coil mod for all that other stuff I mentioned. :)


already did coil mod, first thing i did to bike.

now, in case you havent looked at photos, the head is off the bike, along with jugs and it was found that oil consumption was from 3 damaged oil rings. also the head is in bedroom with me and i have the valves out. just helicoiled 2 camshaft cap holes. after i find or get helicoil for sparkplug hole 1 I will start putting head back together

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Replacing Valve Stem Seals without pulling head 04 Jul 2011 16:15 #460979

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In reading through this I just can't keeping thinking Oh KZ God Why (W/o Pulling Head)? Ah well, I guess I'm just getting old.... :blush:


You're just getting old, well I've been there for a while now...we did it on dragbike motors where we didn't want to pull the top end apart. Not to save money or being lazy, we just figured out a way to do the seals without disturbing anything else and be done in a couple of hours tops.
79 KZ 1075 MKll
79 KZ 1500 MKll dragbike
Gone but not forgotten:
3 X 73 Z1's
1 X 74 Z1A
1 X 75 Z1B

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Replacing Valve Stem Seals without pulling head 04 Jul 2011 16:35 #460983

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As written, race engine/semi recent head rebuild vs. 30 year old engine... sure totally get the concept but if I understood correctly, this post wasn't the case....

Either case, doesn't truly matter for the head has been pulled where he can get to it ideally and learn away and get it all expected and corrected to specifications.

"also the head is in bedroom with me"... Whoa, talk about loving your KZ..... :blink: :laugh:
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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Replacing Valve Stem Seals without pulling head 04 Jul 2011 19:17 #461032

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"also the head is in bedroom with me"... Whoa, talk about loving your KZ..... :blink: :laugh:


it's cool in my room. and we wanted to be comfortable... :p

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Replacing Valve Stem Seals without pulling head 07 Jul 2011 19:25 #461593

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anyone here know on the the standard stock piston, what the oil groove size is?

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