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Cylinder head 14 Aug 2020 08:31 #832878

  • Nessism
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Mikaw wrote: Beyond the old school swing arm pointer type sold at sears 100 years ago that I only trusted to torque lawnmower heads.


A bending beam torque wrench is arguably the best option for garage mechanics. They never go out of calibration and can take a lot of abuse. I broke a pin internal to one of my Precision Instruments dial torque wrench when the nut was sticking and then suddenly released (with a crack noise.) It cost me $75 to have it fixed and calibrated. Now I use the beam torque wrench for head nuts, unless they turn nice and smooth.
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Cylinder head 14 Aug 2020 14:49 #832913

  • VTEC
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Maybe we should get back on topic. I went through the whole thread and didn't see anywhere that the originator specified what bolt in the head broke. He said "a bolt" then started talking about carbs. What bolt broke? Can't be a head bolt because it would have broken off in the block? I originally thought he was talking about a cam cap bolt which we all know commonly pulls the threads out of the head.
KZ1000-K2
ZRX1100
XR400R

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Last edit: by VTEC.

Cylinder head 14 Aug 2020 15:25 #832916

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I guess when the kids are left alone we start to get into the cookie jar.
1976 KZ 900 A4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Cylinder head 14 Aug 2020 17:08 #832923

  • hardrockminer
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When steel is placed under stress such as tension it yields elastically. If it's a bolt under tension it will begin to elongate. Up until it reaches its maximum yield strength it will return to its original size when the stress is removed, hence the term elastic. Beyond its maximum yield strength steel will begin to deform. This is called the plastic zone. Finally, when the steel reaches its ultimate strength it will fail, releasing all of the energy stored in it. Mild steel in tension will neck down in the failure area to about half its original size before snapping. In torsion it can actually twist more than 360 degrees before failing. High strength bolts are more brittle than mild steel. They have a greater yield strength but much less of a plastic zone.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.

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Cylinder head 14 Aug 2020 19:42 #832934

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It was a cam cap bolt. Sorry i have been off for a bit. I did get a helicoil in and it torqued back up. I did not think it should snap like that either but rather strip the hole out of aluminum. But it did.

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Cylinder head 17 Aug 2020 06:31 #833080

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New head came so i will be putting that on today.
Besides dont break a bolt.
Any body have things i should be watching for?

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Cylinder head 17 Aug 2020 06:54 #833082

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Look for cracks, especially in the combustion chamber between the sparkplug and valves.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Cylinder head 17 Aug 2020 13:12 #833107

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Back together. I believe it runs super. First bike I've built from boxes. Saved it from a care racer build.
Try to load some pics and a short video later.
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Cylinder head 17 Aug 2020 13:42 #833112

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Good Lord I must be getting way, way old. Zoomzoompop you got the head at 0831 hrs. this morning and at 1512 hrs. this afternoon you already have it running. Unbelievable.

Rick H.
Rick H.

1977 Kawasaki KZ-1000A1

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Cylinder head 17 Aug 2020 15:19 #833117

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Yup
But it has a little bit of white smoke? For the year of the bike is this normal? Last bike i owned was back in 1998 and that was was just to beat on.

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Cylinder head 17 Aug 2020 15:44 #833119

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I haven't followed the thread closely so apologies if the answer lies in here somewhere. Was the head rebuilt? Just wondering the condition of the valve seats, guides and seals. Did you do a compression test?
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.

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Cylinder head 17 Aug 2020 15:53 #833120

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None of the above. Bought one of ebay. I will prolly do a whole engine rebuild over the winter. Just getting it rideable for the remainder of the riding season.

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