Is my head junk?

headspace
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Is my head junk?

12 Aug 2008 07:27

Bent a exhaust valve on #2 cylinder.
After pulling the head this morning I noticed cracks from the exhaust seat on #2 and #3 through the spark plug threads.

1975 Z1 900 (1015)
1976 KZ900 (dragbike project)

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kawsakiman
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Re: Is my head junk?

12 Aug 2008 09:44

#231588

anything can be fixed if you have the money.
fast by gast can repair it.
fastbygast.com/Catagories/Products/Description/FBGHeads.asp

cheaper to get a new head.

someday i will be able to afford my kz habit.

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BSKZ650
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Re: Is my head junk?

12 Aug 2008 10:54

#231603

it can be fixed, but as stated money talks,, what bent the valve and was it running hot before

77 kz650, owned for over 25 years
77 ltd1000, current rider
76 kz900, just waiting
73 z1,, gonna restore this one
piglet, leggero harley davidson
SR, Ride captian, S.E.Texas Patriot Guard Riders.. AKA KawaBob

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hardr0ck68
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Re: Is my head junk?

12 Aug 2008 19:19

#231683

I seriously doubt those cracks go deep into the metal. It would take a lot of stress to crack the head right through. I would guess they are less than a MM deep...I could be wrong, but I would bet the crack on top for from some ape over tightening a plug.

Send it in to APE (or another qualified motorcycle machine shop) get their opinion, then if its still good get a valve job and that bent valve replaced. If it's no good, or to expensive to repair they will let you know...

1977 kz650 c1

bought it because I was told it would never run again...I like to prove people wrong.

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headspace
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Re: Is my head junk?

12 Aug 2008 19:30

#231689

I was planning on sending to APE before I noticed the cracks. I bought the bike a month ago, wasn't lean or anything like that.
Looks like the exhaust valve whacked the intake:ohmy:

1975 Z1 900 (1015)
1976 KZ900 (dragbike project)

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APE Jay
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Re: Is my head junk?

13 Aug 2008 08:35

#231759

Don't worry about it. Most KZ have that. If you aren't running a turbo or big nitrous load, it will be fine.

Jay

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