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750/4 Forgot Cylinder Stud O-rings
- Nessism
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What do these O-rings do anyway? The later ZX-7 family bikes don't use them at all. I'm wondering if I should tear the top end back down now or gamble and see what happens.
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- SWest
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Steve
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- KZB2 650
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1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
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- Nessism
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KZB2 650 wrote: Hate to admit it but I did the same thing, felt the same way and have been trying to forget it........ have 900 miles on it and three years with no leaks..... re torgued at 50 miles after first warm up and cool then again at 600.......... I'm leaving mine alone. Like you say they stopped using them so I hope they figured out they were not needed.
Good to hear about no leaks.
![:) :)](/media/kunena/emoticons/8.png)
I've got a parts engine so I'll look at the crankcase parts tonight and try to figure out why they spec O-rings. Only thing I can think of is that maybe the stud holes interconnect with an oil galley passage. Seems odd that only those two studs are supposed to have the O-rings so something must be going on there.
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- Nessism
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swest wrote: Has it been started yet? If not you should be able to reuse the gasket. It would nag me forever and if it did leak, No one could beat me up more than me. :dry:
Steve
Don't think I'd be able to reuse the gaskets. I used RTV on both the base and head gasket per the service manual's direction, so you can't reuse the gaskets (typically) because they pull apart when you try to release the clamp load. Oh, engine hasn't run yet. Just installed it in the chassis yesterday.
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- SWest
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One other question now: I forgot the rubber plugs that go into the holes in the cylinder. Any consequence of these missing?
![[IMG](http://i101.photobucket.com/albums/m50/Nessism1/750%20cylinder_zpsfqcb9smm.jpg)
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- KZB2 650
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1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
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- Tyrell Corp
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Part 4 on the diagram is superseded with a revised part with shrouding at the sides, I would upgrade on this.
92043-1210
Attachment T2eC16dHJHFFmD-46qBRuK5Ditkw60_35.jpg not found
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
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- sflesch94
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- sflesch94
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That makes sense. So realistically if the oil was getting past the stud threads it would show as oil leakage outside the engine, on top of the head where the head nuts are correct? The base gasket and head gasket should prevent that oil from passing into the cylinder and burning oil?They are only there as those two stud threads are open to the crank shaft cavity. The remainder are blind. The o rings were there to prevent oil making its way past the stud threads but I've never seen it happen with or without o rings. The open thread end is not below the oil level and only gets oil on it from crank rotation throw off. As that cavity is not high pressure its unlikely to force oil past the thread.
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