photos bad camcaps...

  • joe*
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photos bad camcaps...

19 Feb 2012 18:03
#505109
anyone want to weigh in on the condition of these?



the worst scratches are left to right, the crosshatching I've never seen before, this is cap #4,5,6


I don't remember this burnt bucket thing - normal?

My justification for the new jugs, hope you can see this island in the cylinder wall.


Cylinder 3 has the worst black coral growth.

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Re: photos bad camcaps...

19 Feb 2012 18:04
#505110
various other ugly dirty parts

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Re: photos bad camcaps...

19 Feb 2012 18:07
#505111
oops!
various other ugly dirty.....

I had the jugs off 5000 miles ago and had the head bead blasted and the valves lapped. It now reads 20,000 mi.

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  • mark1122
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Re: photos bad camcaps...

19 Feb 2012 18:55 - 19 Feb 2012 19:17
#505120
what r we looking at? it would be better for u , if u put the modle and yr in your signature.
the pistons look like 10.25:1's
cam caps look like the shell bearings were spinning in them ?
the buckets have seen some heat but should be ok.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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Last edit: 19 Feb 2012 19:17 by mark1122.

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  • joe*
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Re: photos bad camcaps...

19 Feb 2012 19:06
#505126
its an '82 750n. I don't know what shell bearings are. Any input on how bad the cam caps are?

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Re: photos bad camcaps...

19 Feb 2012 19:21
#505130
ok, they didnt have shell bearings in that motor.KZ900/1000, do.
it looks like u ran low on oil up there. u may want to do a thorough cleaning of the oil galleries just to be sure. there should be a spec for cam to cap clearance that can be measured with plasti gauge. look in your manual. they do look pretty rough though.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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Re: photos bad camcaps...

19 Feb 2012 20:08 - 19 Feb 2012 20:08
#505139
Do the corresponding cam journals in the cylinder head show the scoring similar to that visible in the cam caps?
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 19 Feb 2012 20:08 by 650ed.

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Re: photos bad camcaps...

19 Feb 2012 20:15
#505142
mark1122 wrote: ok, they didnt have shell bearings in that motor.KZ900/1000, do.
it looks like u ran low on oil up there. u may want to do a thorough cleaning of the oil galleries just to be sure. there should be a spec for cam to cap clearance that can be measured with plasti gauge. look in your manual. they do look pretty rough though.

Mark is spot on - download or buy the Kawi service manual as it has the specs in there - internal bearing size, cam bearing size, and clearance to measure using plastigauge.

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Re: photos bad camcaps...

19 Feb 2012 20:17
#505143
I wonder if a previous owner put the cams in dry after adjusting the valves?
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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  • Motor Head
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Re: photos bad camcaps...

19 Feb 2012 20:46
#505146
You say the head was bead blasted 5K miles ago. Well that looks like the blast material came out from hiding in the oil galleys and went through the bearing surface, grit, ouch!
So back then you didn't do the rings? Or check the bore? You say you "Lapped" the valves, did you at least replace the stem seals?
Service manual, this is needed so you can measure and inspect the engine components.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
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Re: photos bad camcaps...

19 Feb 2012 20:49
#505147
Motor Head wrote: You say the head was bead blasted 5K miles ago. Well that looks like the blast material came out from hiding in the oil galleys and went through the bearing surface, grit, ouch!
So back then you didn't do the rings? Or check the bore? You say you "Lapped" the valves, did you at least replace the stem seals?
Service manual, this is needed so you can measure and inspect the engine components.

good call. blast media could verywell be the culprit. :(
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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  • bountyhunter
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Re: photos bad camcaps...

19 Feb 2012 20:51 - 19 Feb 2012 20:52
#505148
650ed wrote: I wonder if a previous owner put the cams in dry after adjusting the valves?
Hard to believe even that could do so much damage. I'm believing the "sand in the oil" theory, what an awful waste. I think that head is hosed.
1979 KZ-750 Twin
Last edit: 19 Feb 2012 20:52 by bountyhunter.

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