Welcome, Guest
Username: Password: Remember me

TOPIC:

Katit's 1978 KZ650 project 11 Apr 2021 18:00 #846545

  • katit
  • katit's Avatar Topic Author
  • Offline
  • User
  • Posts: 471
  • Thank you received: 48
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
Attachments:

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 11 Apr 2021 18:06 #846546

  • katit
  • katit's Avatar Topic Author
  • Offline
  • User
  • Posts: 471
  • Thank you received: 48
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
Attachments:

Please Log in or Create an account to join the conversation.

Last edit: by katit.

Katit's 1978 KZ650 project 12 Apr 2021 05:20 #846569

  • hardrockminer
  • hardrockminer's Avatar
  • Offline
  • Sustaining Member
  • Posts: 2924
  • Thank you received: 1021
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.

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 12 Apr 2021 06:40 #846572

  • bluej58
  • bluej58's Avatar
  • Offline
  • Sustaining Member
  • The chrome don't get you home
  • Posts: 2484
  • Thank you received: 511
You should have numbered the valves and shim/buckets if you are planning on reusing them.
78 KZ1000 A2A

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 12 Apr 2021 07:25 #846575

  • katit
  • katit's Avatar Topic Author
  • Offline
  • User
  • Posts: 471
  • Thank you received: 48

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

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 12 Apr 2021 16:07 #846599

  • Nessism
  • Nessism's Avatar
  • Offline
  • Sustaining Member
  • Posts: 7278
  • Thank you received: 2671
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.

The following user(s) said Thank You: katit

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 13 Apr 2021 08:02 #846630

  • katit
  • katit's Avatar Topic Author
  • Offline
  • User
  • Posts: 471
  • Thank you received: 48
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

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 13 Apr 2021 20:04 #846656

  • katit
  • katit's Avatar Topic Author
  • Offline
  • User
  • Posts: 471
  • Thank you received: 48
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
Attachments:
The following user(s) said Thank You: Nessism

Please Log in or Create an account to join the conversation.

Last edit: by katit.

Katit's 1978 KZ650 project 13 Apr 2021 20:08 #846657

  • katit
  • katit's Avatar Topic Author
  • Offline
  • User
  • Posts: 471
  • Thank you received: 48
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
Attachments:

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 14 Apr 2021 10:14 #846699

  • Mikaw
  • Mikaw's Avatar
  • Offline
  • Sustaining Member
  • Posts: 4889
  • Thank you received: 1849
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.

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 14 Apr 2021 10:23 #846700

  • katit
  • katit's Avatar Topic Author
  • Offline
  • User
  • Posts: 471
  • Thank you received: 48

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

Please Log in or Create an account to join the conversation.

Katit's 1978 KZ650 project 14 Apr 2021 11:09 #846703

  • Mikaw
  • Mikaw's Avatar
  • Offline
  • Sustaining Member
  • Posts: 4889
  • Thank you received: 1849
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.

Please Log in or Create an account to join the conversation.

Powered by Kunena Forum