Topic: gl1000 front on cb

[cxtecs]

   You'll also have to make new fork stops for the GL forks (to keep the forks from slamming into the tank).

Are you talking about the crescent shaped plate that is welded to the headtube?

I agree, at least on my bike, the GL front end needed to travel on a limited arc.  I just drilled and tapped some holes on the the two posts sticking up from the bottom tree and screwed in some allen head screws which eventually hit the plate.  That way I could finely adjust were the forks stop.

[robe0531]

very nice idea this tapping the stop so you fine tune the turning to your needs

[Jim F]

I replaced the entire front end from a 75 GL1000
I had to take the inner race for my tapered steering head  bearings
and use that on the GL1000 but that's all.
Your dash assembly wont bolt up but you can make brackets for that
or in my case I am going to use a small tech and that's all.

[MikeB]

 Obviously you must use the GL tree's as the tubes are 37mm. Rotors are different than the 750s but the wheel and hub is interchangeable.

This is great guys I have been looking for 37mm uppers to replace the ones that are bent on my
82 cb650 Nighthawk ,seem they are also 37mm and alittle longer than other CBs
did not think to look at the goldwings front


Very nice  job eurban


and thanks MCRider for the links

Mike

Are you sure that your 82 nighthawk has 37mm tubes?? I was under the impression that forks didn't change size until they went to the DOHC in 83?  Anyways, you need to consider the spacing between the fork tubes and their distance (front to back) from the steering stem as well.  I would guess that the spacing on GL pieces is different from the 37mm DOHC ones but I don't know for sure. . . .

yea they are, checked 4 times, 1.457" 
and the research continues 

again nice job on these front ends guys
and thanks for all the info

Mike

[robe0531]

i am a litte confused here can i use the cb750 races or do i need to use the gl1000 races for the bearings

[Jim F]

I had to use the lower inner race from the 750 steering head to the GL1000 steering head
and everything bolted up

[robe0531]

ok
thanks

[Hinz]

I had to use the lower inner race from the 750 steering head to the GL1000 steering head
and everything bolted up

I'm having a little problem visualizing this. Can you explain better? Maybe include a pic or drawing? What do you mean by "steering head"?

[fishhead]

Probably the steering stem.

 Heres 2 links

http://forums.sohc4.net/index.php?topic=46084.msg484557#msg484557
 And
http://forums.sohc4.net/index.php?topic=46362.msg486489#msg486489

[Hinz]

awesome. Thanks Fishhead, those links help explain much better.  There's no replacement for specific dimensions and pictures. 

I call the cylindrical part of the frame where the steering assembly get bolted to, as the "Head" since it is at the head of the frame.
The threadded rod that connects the 2 triple trees, I've allways called the "Neck".  No explanation why thou.

I'm not sure if this is "industry standard" but some sort of standardized lingo would help to avoid confusion in situations like this.

[Hinz]

Kinda..
  The steering stems are the same. The 75-77 GL uses K&L kit number 31-5830 that has an upper bearing of 26 X 48.5 X 15.2 and a lower bearing 30 X 50 X 14.4.
 The 78-79 GL uses K&L kit number 31-2260 and it consist of an upper bearing 26 X 47 X 17.3 and a lower bearing 30 X 55 X 17.
 The first digit of the bearing size is the inside diameter of the bearing and is where it would sit on the stem. The only differnce between the 75-77 and 78-79 GL is the frame was changed where the bearings sit and the changes in outer dimension of the bearings show this change.
 
 Now back to the Kinda..
 The only difference between the lower triple tree is the fork stops are wider apart(about 10mm) on the 78-79 than they are on the 75-77. This is because of the larger bearings used in the later GL. Other than that, they are identical.

 What usually happens next is some one will chime in with an online list that was compiled with many hours of work stating that I am wrong.
  The online list is wrong. I have both of the GL front ends and I have measured them many times.

 The steering stem bearing kit for the CB 750 is the same one for the 75-77 GL 1000. It will also work when you put the 78-79 GL steering stem on your CB 750 K. (SOHC as the DOHC uses a different kit)

so since i'm putting a 75 GL1000 assembly on a 76 750K frame, I "shouldn't" have to mix and match the bearings?  I have the All Ballz kit for the 750K and just wanted to make sure I have the right parts before I try and install them.

[Bruiser]

Hey...new member here...sorry for intrusion but there is something I don't know about:

It's been made obvious, from here and other research, that the most logical and easy swap for a duel brake spoke rim is to us a 75-77 GL1000.

However there are two things I need to know before I pursue a path. I have a 74 that was tried to be duped as a harley/chopper so the forks are 6+ inches longer which makes it look & ride like crap. I have a pair of 77f forks but I think that becomes a bigger issue than using the GL (correct me if i'm wrong ie: spacers and schtuff)

Q1. Am I absolutely able to use my current 74 rim & tire?
Q2. Without sounding too much like an idiot, what is and how difficult is it to install fork stops?

I guess the least expensive route is just to get original forks but I like the look and the idea of better braking power.

Super Thanks


!!!RANDOM THOUGHT!!!
can i just get a second rotor caliper and mount it to a pair of 76 forks that i found on ebay??