Replace Clutch plates

  • gordone
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Replace Clutch plates

07 Sep 2020 05:33
#834514
I’m going to replace the clutch plates during the winter, but have a question to draining the oil.

I’m normaly prefer to drain the oil when its warm, but I cannot start up the dngine when I have placed it for winter storage...

So...
Option 1:
Warm up the engine, drain off oil. Store the bike and replace friction plates after 1-3 months and fill up oil again...

Option 2:
Winter store the bike and drain cold oil, replace friction plate and fill up oil again...

What do you think?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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  • Nessism
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Re: Replace Clutch plates

07 Sep 2020 05:43
#834517
If you put the bike on the side stand when the clutch cover is removed some oil will be lost but not too much. When doing the last oil change for the year it will help if you remember to only fill to the bottom of the sight glass.

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Re: Replace Clutch plates

07 Sep 2020 05:47
#834518
Nessism wrote: If you put the bike on the side stand when the clutch cover is removed some oil will be lost but not too much. When doing the last oil change for the year it will help if you remember to only fill to the bottom of the sight glass.

I understand, but will prefer to add new oil after the work is done... what you are saying I should Replace the oil hoot and not store without oil?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Re: Replace Clutch plates

07 Sep 2020 06:37
#834524
Nessism wrote: I would store with oil.

Thank you :)

I will do normal filter and oil change and suck (vaacum) out oil possible from the filling oil :)

Don’t have enougf space for side stand :)

One thing more the metal plates in the clutch should I clean them or do something with them? Nothing is mention in the haandbook...
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Re: Replace Clutch plates

07 Sep 2020 06:48 - 07 Sep 2020 06:48
#834527
It really shouldn't matter much hot or cold. I've always changed the oil in my 1977 KZ650 when the oil is cold. I've owned the bike since it was new (43+ years / 62,000+ miles). Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Last edit: 07 Sep 2020 06:48 by 650ed.

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  • hardrockminer
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Re: Replace Clutch plates

07 Sep 2020 10:46
#834541
Check the steel plates to see if they are warped. (Unlikely) Measure the friction plates thickness. They may still be within the specification. All of this is in the manual.
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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Re: Replace Clutch plates

07 Sep 2020 13:44
#834556
I try to ask again, when you overhaul the clutch, shall you do something with the metal plate? Clean them?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Re: Replace Clutch plates

07 Sep 2020 13:56
#834557
You can clean the steel plates if they need it.
It won't do any harm to have them blast cleaned to etch the surface but as long as they are flat and rust free there's no real need.
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Re: Replace Clutch plates

08 Sep 2020 04:27 - 08 Sep 2020 05:11
#834582
I've read that a hd mirror is flat enough to check the plates and then maybe a very light scuff with x fine steel wool, clean with brake cleaner and a light coating of the bike oil and you should be set. Maybe change the oil hot and add 2 qts till you change out the plates ? I like to pull the plugs and give each cyl a shot of oil followed by a quick spin...... I even open the carbs full and give a quick shot of wd-40 through the carbs while spinning to coat the valves but I will admit this might be a little over kill.

Your factory manual should have this........... out of my 650 manual (so it might be diff from your 750.......... steel plate warp (using a mm feeler....... under .20mm with a service limit of .40mm. Like stated dought if they are bad. I also marked mine with a black marker to keep them in the same location (in the basket) and order that they've been in for all these years. The tabs and the housing clearance shows .34mm to .75mm standard and a service limit of 1.0mm.
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.
Last edit: 08 Sep 2020 05:11 by KZB2 650.
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Re: Replace Clutch plates

09 Dec 2020 11:45
#839681
KZB2 650 wrote: I've read that a hd mirror is flat enough to check the plates and then maybe a very light scuff with x fine steel wool, clean with brake cleaner and a light coating of the bike oil and you should be set. Maybe change the oil hot and add 2 qts till you change out the plates ? I like to pull the plugs and give each cyl a shot of oil followed by a quick spin...... I even open the carbs full and give a quick shot of wd-40 through the carbs while spinning to coat the valves but I will admit this might be a little over kill.

Your factory manual should have this........... out of my 650 manual (so it might be diff from your 750.......... steel plate warp (using a mm feeler....... under .20mm with a service limit of .40mm. Like stated dought if they are bad. I also marked mine with a black marker to keep them in the same location (in the basket) and order that they've been in for all these years. The tabs and the housing clearance shows .34mm to .75mm standard and a service limit of 1.0mm.

steel plate warp (using a mm feeler....... under .20mm with a service limit of .40mm.

How do you do these ? I dont understand how I can measure the wrap wrap with feeler :) hehe
Do I put all metal plate on top of each other and see if I can put the feeler in between them ???
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Re: Replace Clutch plates

09 Dec 2020 11:51
#839682
Put the plate on a really flat surface and try to put the feeler gauge between the plate and surface.
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