Topic: 1973 CB750K3: Doing a front fork rebuild- what parts should I order?

[Gears]

That could be it. It's a kind of ring in a groove. My honda service manual doesn't show them. I guess I need to get my hands on the parts book.

Luckily, I'm not going to replace the fork tubes this season, but I do plan to next winter, so good to know what I'll need for the new ones. 

[Johnie]

If you look at the pic below part #17 is at the very bottom of the lower fork tube. That is the part the allen bolt screws into or through (I can not recall which). Part #19 inserts into the top of part #17. Those may be what you are seeing or hearing down there. Don't loose the copper washer at the bottom of the allen bolt. Click the pic to enlarge it...

[Bob750]

Yeah, That's the oil lock. It's not threaded, just sits like a washer down there between the "Pipe, Lower" and the "Case." The Allen bolt goes through it and holds it tightly onto the Lower Pipe. It's very lightweight aluminum--low mass. I inverted my cases and vertically pounded them on 1" thick carpet in garage. A few blows, and "tink" there it was, ready for cleaning. Alternately you might poke at it through the bolt hole in the bottom...


Forgot to mention... look up Leak Proof Pro-Moly fork seals...

[Gears]

Okay guys, I have pictures for you.


So everything is disassembled. I did find the oil locks at the bottom of the lower tubes



This was the part I was talking about. These shots are of the bottom of the fork tube and its about 2" in. I can't seem to find it in any schematic for my K5. Anybody know what it is?

[Bob750]

This was the part I was talking about. These shots are of the bottom of the fork tube and its about 2" in. I can't seem to find it in any schematic for my K5. Anybody know what it is?

Here's a shot I took of the same internal structure. I think it's a secret or something...  Dunno where to find info on it. No schematic I've seen shows it. I've found that the sleeve will turn a tiny bit, but not like it's threaded, I think it's pressed in during manufacture. I just ordered a new set of US made repro upper fork tubes here that I'm waiting to be delivered, well because my tubes were crap. (See second photo.)

[Gears]

Yeah, that's what I'm curious about. As you can see, my forks are rusty as hell up around the triple trees(damn headlight ears), and I want to replace them, but I'm not sure if I'd have to order that piece or not.

I'm going to wait until next season to replace my forks, but let me know how those new ones turn out for you Bob750.

[squeakywheelz]

A month late, but for what it's worth - just received a replacement set of fork tubes from cycle-x and that little internal lip you point out has already been pressed in.  As I don't see a good way to remove it from the old tube, I can only assume that it is pressed in and not readily serviceable.  Trying to recall what sits under it - holds the smaller rebound spring in place?

[Bob750]

Here are some pics of the fork tubes I received from TAS Classic Motorsports. They come from Frank's.

[Bob750]

More pics. Notice that in one of the images I had installed the forks without the boots and boot rings. When I went to pull them so that I could slide the boots on, I noticed that I also had them mixed up left to right. It's all fixed now of course. the fender and brake hardware would have been difficult to reinstall don't you think?  Heh.

[rbirkhan]

Really great info im about to install cycleX tubes. I know this is off topic but its related where is everyone getting new fork gators? Also dont forget the fork tripple tree d shaped spacer washers.  I didnt see it in the fork rebuild video and can ruin your day fast.

[Gears]

A month late, but for what it's worth - just received a replacement set of fork tubes from cycle-x and that little internal lip you point out has already been pressed in.  As I don't see a good way to remove it from the old tube, I can only assume that it is pressed in and not readily serviceable.  Trying to recall what sits under it - holds the smaller rebound spring in place?

Great. That's one mystery solved.

[Bob750]

Really great info im about to install cycleX tubes. I know this is off topic but its related where is everyone getting new fork gators? Also dont forget the fork tripple tree d shaped spacer washers.  I didnt see it in the fork rebuild video and can ruin your day fast.

Gators aka Front Fork Boot, schematic part #17: http://www.bikebandit.com/houseofmotorcycles/1974-honda-motorcycle-cb750k4-front-fork/o/m9235sch398553
Spacer, schematic part #9: (not available, but you could cut or grind a washer): http://www.bikebandit.com/houseofmotorcycles/1974-honda-motorcycle-cb750k4-handlebar-fork-top-bridge/o/m9235sch397875