Katit's 1978 KZ650 project

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11 Apr 2021 18:00 #846545 by katit
Replied by katit on topic Katit's 1978 KZ650 project
Painted engine cases. Cerakote instructions call for 5 days until final cure. I painted clutch cover (see in comparison to unpainted covers).Clutch cover is to be polished. I painted just so I can make some experiments on how it holds.

The only part I didn't do per instruction - it wasn't sand blast. It was bead blast which they don't like, but let's see how it holds. Used very little paint. This can is enough for 3-4 engines.

 
78 KZ650B2A - resto in progress
www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s
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11 Apr 2021 18:06 - 11 Apr 2021 18:06 #846546 by katit
Replied by katit on topic Katit's 1978 KZ650 project
Have a question about valves.

1. I took guides out (rusty, pitted in channels) - ordered set of bronze APE relacements. Is 7.00mm correct reamer to use?
2. Valves. See pics, they were rusty, black paint? Came off in spots. Is it bad? Also I see valve working surfaces is not flat, but round-ish. Looks like bad "lap" job. My assumption they need to be replaced, what do you think? Maybe shop can grind them, but at $10/ea it might be better to replace, no?

So, I can do myself cutting (with neway cutters) and press in guides (have press, can heat head, etc). Just need shop to fix threads

 
78 KZ650B2A - resto in progress
www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s
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    • Last edit: 11 Apr 2021 18:06 by katit.

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    • hardrockminer
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    12 Apr 2021 05:20 #846569 by hardrockminer
    Replied by hardrockminer on topic Katit's 1978 KZ650 project
    The old valves look dirty but you should be able to clean them with a bead blast, not sand blast.  Measure the overall length and measure the diameter several times in the area where they go through the guides.  If they are in spec I would probably use them again.
    I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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    • bluej58
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    • The chrome don't get you home
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    12 Apr 2021 06:40 #846572 by bluej58
    Replied by bluej58 on topic Katit's 1978 KZ650 project
    You should have numbered the valves and shim/buckets if you are planning on reusing them.
    78 KZ1000 A2A

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    12 Apr 2021 07:25 #846575 by katit
    Replied by katit on topic Katit's 1978 KZ650 project

    You should have numbered the valves and shim/buckets if you are planning on reusing them.
    Buckets numbered of course (with springs/washers)
    But I will be replacing guides and cut seats. So, shims will need to be done from scratch.

    Thats why I am thinking new valves to give most "meat" possible to account for seat cutting.
    78 KZ650B2A - resto in progress
    www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
    Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s

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    12 Apr 2021 16:07 #846599 by Nessism
    Replied by Nessism on topic Katit's 1978 KZ650 project
    The valve stem needs to be cut to compensate for seat machining.  

    You might want to call around to see if you can a shop with a centerless valve grinding machine.  It literally takes 3 mins to resurface the face and stem with one of these machines, and good shops won't charge you an arm and a leg since it's so fast.

    Ed
    Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

    www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

    1981 KZ750E2
    www.kzrider.com/forum/11-projects/604901...z750e-project-thread
    The following user(s) said Thank You: katit

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    13 Apr 2021 08:02 #846630 by katit
    Replied by katit on topic Katit's 1978 KZ650 project
    Ed, manual put's this in bolt: "Do not grind valves". Because it may cause other issues like keepers coming loose, etc. 
    I put order for new valves, yes, might be little over what shop would charge but if new valves will allow me not to shorten them - thats a win.

    I found a shop that sounds like they know what they are doing. Once I get parts I will take it there.

    Yesterday I checked pistons/rings. All look good and in service range. Ring gap is about 0.35 on border with "acceptable" but definitely not in "replace" range. Will go with honing. It's always easy to replace pistons and bore cylinders later if needed. My goal is to get engine assembled now.
    78 KZ650B2A - resto in progress
    www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
    Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s

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    13 Apr 2021 20:04 - 13 Apr 2021 20:05 #846656 by katit
    Replied by katit on topic Katit's 1978 KZ650 project
    Thanks to Nessism clutch dumpers were replaced quickly and easy. I am not a welder but it worked great.

     
    78 KZ650B2A - resto in progress
    www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
    Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s
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    • Last edit: 13 Apr 2021 20:05 by katit.
    The following user(s) said Thank You: Nessism

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    13 Apr 2021 20:08 #846657 by katit
    Replied by katit on topic Katit's 1978 KZ650 project
    Cylinders don't excite me. But I will run it as is. Rings is within specs, pistons within specs. I don't have bore gauge, but according to rings - it's OK-ish.
    However, deposits on cylinder 4 did not come out.

    Anyhow, I made a decision to run it as is. If I ever wanted to - pistons seem to be readily available and boring is not a problem. All can be done "on a bike"

     
    78 KZ650B2A - resto in progress
    www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
    Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s
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    14 Apr 2021 10:14 #846699 by Mikaw
    Replied by Mikaw on topic Katit's 1978 KZ650 project
    That Ceracoat color is really nice. If it holds up then it’s a real winner... project is looking good.
    1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
    1976 KZ 900 B1 LTD
    1978 KZ 1000 B2 LTD
    1980 KZ 750 E1
    Kowledge Speaks, But Wisdom Listens.
    Jimi Hendrix.

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    14 Apr 2021 10:23 #846700 by katit
    Replied by katit on topic Katit's 1978 KZ650 project

    That Ceracoat color is really nice. If it holds up then it’s a real winner... project is looking good.

     

    Still not 5 days yet for testing. But I did honing on cyclinder block yesterday. So, oil got on paint, I moved block around, cleaned with brake clean afterwards, etc. - no issues with paint.
    78 KZ650B2A - resto in progress
    www.kzrider.com/forum/11-projects/615161...s-1978-kz650-project
    Other bikes: 1978 BMW R100/7, 1978 Moto Guzzi T3, 2016 DRZ400s
    The following user(s) said Thank You: Nessism

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    14 Apr 2021 11:09 #846703 by Mikaw
    Replied by Mikaw on topic Katit's 1978 KZ650 project
    Then so far so good.

    I haven’t honed and cylinders yet but did inquire into the process. It was recommended that you use white cotton tee shirts with trans fluid and continue to wipe the cylinders down till the tees come out clean. 
    1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
    1976 KZ 900 B1 LTD
    1978 KZ 1000 B2 LTD
    1980 KZ 750 E1
    Kowledge Speaks, But Wisdom Listens.
    Jimi Hendrix.

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