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Author Topic: Missing front axle parts?????  (Read 1075 times)

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Offline KC_Northstar

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Missing front axle parts?????
« on: March 27, 2013, 02:17:41 PM »
I just disassembled the front wheel hub of my CB750 K2 to install new bearings.  When I look at the parts fiche, I see that I am missing parts.    I layed out everything I removed just like it is in the fiche for the picture.  I am missing part 10.  Part 9 looks a little different and I don't have the O ring part 20.  Are those parts from other years.  My parts book is K0 thru K2.

KC

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KC

1971 CB750-K1
1972 CB750-K2
1971 SL350-K1
1971 SL125-K0
1979 CM400A

Offline flybox1

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Re: Missing front axle parts?????
« Reply #1 on: March 27, 2013, 02:38:31 PM »
Looks exactly like someone was ready to do a dual front rotor setup.
you omit #10 with dual discs, and modify #9(speedo drive plate modification) to look like whats in your picture.....
#20 o-ring is omitted as well so the rotor fits flush against the hub.  guessing its purpose is there to seal an (unmodified) #10 against the hub from water/debris.
« Last Edit: March 27, 2013, 02:40:54 PM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline flybox1

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Re: Missing front axle parts?????
« Reply #2 on: March 27, 2013, 02:42:40 PM »
BTW, I have a #10 (K1) if you are in need.  Just PM me...
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline KC_Northstar

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Re: Missing front axle parts?????
« Reply #3 on: March 27, 2013, 03:46:16 PM »
Ok,  starting to make sense now.  I cleaned up the parts and it looks like part 9 used to be cup shaped and they cut
off the outer edge leaving two little tabs sticking up.  Those tabs catch on two notches ground out on the hub. So the hub
was modified also??  So looks like to put this back I will need parts 9,10 and 20?



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KC

1971 CB750-K1
1972 CB750-K2
1971 SL350-K1
1971 SL125-K0
1979 CM400A

Offline flybox1

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Re: Missing front axle parts?????
« Reply #4 on: March 27, 2013, 08:06:17 PM »
Yes, #9 was cup shaped at one time, and excess was trimmed so it floats inside the center of the rotor carrier.
(I just did this mod for my K8)

no, the hub is not modified.  from factory it has the notches like that. 

if you want to put it back to the original config, then yes, you'll need a NEW (unmodified) #9, 10 & 20.

you dont need 10 or 20, if you go with 9 as it sits now.  you'll just have a collection of gunk in the speedo drive grease after a bit.  nothing there to keep it sealed.
« Last Edit: March 27, 2013, 08:09:39 PM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline KC_Northstar

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Re: Missing front axle parts?????
« Reply #5 on: March 27, 2013, 08:12:59 PM »
and than aswers why the rotor bolts are so long.  There were 5 washers stacked under the bolt head to make it fit.  I bet the PO took off the other rotor and added the washers.  I need to find shorter bolts also.
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KC

1971 CB750-K1
1972 CB750-K2
1971 SL350-K1
1971 SL125-K0
1979 CM400A

Offline flybox1

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Re: Missing front axle parts?????
« Reply #6 on: March 27, 2013, 08:16:31 PM »
lol...yeah. the PO strikes again. you can always trim them down then wire wheel them.
2 rotor setup bolts are M8 110mm.  i think oem are M8 105's, but dont quote me.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline KC_Northstar

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Re: Missing front axle parts?????
« Reply #7 on: March 27, 2013, 08:21:49 PM »
Quote from: flybox1 on March 27, 2013, 02:42:40 PM
BTW, I have a #10 (K1) if you are in need.  Just PM me...


For now I think I'll just put it back the way it is and then change it after I find the parts.  I'm interested in the part
you have if its in good shape.  I will pm you.

KC
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KC

1971 CB750-K1
1972 CB750-K2
1971 SL350-K1
1971 SL125-K0
1979 CM400A

Offline flybox1

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Re: Missing front axle parts?????
« Reply #8 on: March 27, 2013, 10:19:45 PM »
Here's what I have...
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline jerry h

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Re: Missing front axle parts?????
« Reply #9 on: March 27, 2013, 10:25:19 PM »
I have a #9 (unmodified ;D) if you need it. PM
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