Topic: GL 1000 forks on the CB

[Jim F]

ok guys I know there has been allot on this subject
but I just cant find it in here or I am not putting in the right key word to find
the subject

I have some 77 GL forks that I am going to use on the 750


the simple question is what do I need to change and what can I use from the 750

thanks guys

Jim

[Short Round]

I think I remember a member here doing the same thing to a 400 super sport if I remember correctly, but I am not sure what mods he had to do to make it fit.     Yeah I think this is it.  I saved it because he had made some brackets to fit newer calipers on the swingarm as in the bottom pic.

[Terry in Australia]

Not that much is needed Jim, you need the forks and the trees, and you might need to replace the GL steering stem with the 750's to fit the 750 frame. I take it you'll be using the GL front wheel and brakes? Make sure you fit the bigger GL master cylinder too! Cheers, Terry. 

[Jim F]

Do I need to replace the 750 wheel with the GL?

[eurban]

For the wheel,  you will need the GL rotors, rotor bolts, spacer, speedo drive and axle.  These should work with a 750 wheel since the hubs are identical, however the GL wheel uses a nice lightweight alloy DID rim so you might consider getting the entire assembly.  You will also need the GL calipers as they are completely different (this is a good thing) from the 750 pieces.  For reference heres a pic of the GL1000 front end on my 78750K. Note that stock GL rotors don't look like swiss cheese.

[Jinxracing]

Hiya Jim, here's a link to the thread I posted on the subject...

http://www.sohc4.us/forums/index.php?topic=16903.0

The swap is really pretty easy on a 750.

Jim

[Jim F]

very cool guys
thanks for all your help

will start to post pictures soon

Jim


and remember
Laser welding is the only way to weld broken float bowl posts

[Geeto67]

From what I remember....you need to sell your 77 forks and hunt down a pair of 1975-76 GL1000 forks. You will need everything from the top clamp to the tire (including the brakes) but it will all bolt on. As far as I know the 77 forks are different enough.

The other posts handled this pretty well so I will only add this one thing, unless you are going for the chopper extended fork look, get a set of clip-ons  and mount them above the triple tree by sliding the forks through. you will also need to fab a mount for your gauges.

[dusterdude]

right,the 77 uses a different bearing in the steering neck,dont remember which one though.

[hahnda]

   Upper: 26 x 48.5 x 15.2   
   Lower: 30 x 50 x 14.4   
Honda   C250N (79)
Honda   CB250 (Early Models)
Honda   CB250RS (80-84)
Honda   CBX250RS
Honda   CM250T Rebel (82-84)
Honda   GB250F/F2
Honda   MVX250 (83-84)
Honda   VT250F (83-86), VTR250 (88)
Honda   CB350F/F1 (73-74), CB350G (73), CB350/ K2-K4 (69-72)
Honda   SL350 /K2/K3 (69-73)
Honda   CB360 (74-76), CB360GT (76), CB360T (74-77)
Honda   CJ360T (76-77), CL360 (74-75)
Honda   CB400A (74-75), CB400F (75-77), CB400TI/TII (78-79), CB400T (80-81)
Honda   CBX400F
Honda   CM400A/C/E/T (79-81)
Honda   GB400
Honda   CB450/K1-K7 (65-74), CB450T (82), CB450SC (82-86)
Honda   CL450 /K2-K6 (68-74)
Honda   CM450A/C/E (82-83)
Honda   CB500/K1/K2 (71-73), CB500T (75-76)
Honda   CX500 C/D (78-81)
Honda   FT500 Ascot (82-83)
Honda   GB500F/F2
Honda   GL500/I (81-82)
Honda   VT500 Ascot (83-84), VT500ED, VT500C/FT (83-84)
Honda   CB550K/K1 (74-78), CB550F (75-77), CB550SC (83)
Honda   CBX550F (82-83)
Honda   CB650 (79-82), CB650C (80-81), CB650SC (82-85), CBX650ED/SCD
Honda   CX650C (83), CX650ED
Honda   GL650/I (83)
Honda   VT700C (84-85)
Honda   CB750K (69-78), CB750A (76-78), CB750F (75-78)
Honda   VFR750C (83)
Honda   VT750C (83)
Honda   GL1000 (75-76)
Honda   GL1000L (76)


The 77-79 GL1000 used an upper 25 x 47 x 15 and a lower 30 x 55 x 17.

[Terry in Australia]

you might need to replace the GL steering stem with the 750's to fit the 750 frame.

 It bolts into the stock frame. Replace the bearings with tapered bearings.
 

Apparently not. 

[dgfischer]

you might need to replace the GL steering stem with the 750's to fit the 750 frame.

 It bolts into the stock frame. Replace the bearings with tapered bearings.
 

Apparently not. 

Apparently so.

    The K&L part number for the 75-76 GL is 31-5830 and the bearings measurements are 26-48.5-15.2 and 30-50-14.4. The K&L part number for the 77-79 is 31-2260 and the bearings are 26-47-17.3 and 30-55-17. The frame was modified on the GL in 77/78 to accept the different bearings(they went to a tapered roller bearing) but the steering stem is the same.
    When putting the 75-79 GL stem on your CB 750 SOHC, you would use the 31-5830 bearing set (it has the frame dimensions that are correct for the CB frame and the GL stem).

 You would use 25-47-15 and the 30-55-17 bearings (mentioned above) when installing bearings on many Suzuki models like the 82-83 GS 750. They have the K&L Part number 31-2218.

[eurban]

I thought that the stem was identical to the SOHC 750 stem?  Shouldn't this mean that the tapered bearing kit for the 750 would work fine for the conversion?

[hahnda]

Got this off of Pro-Flo.com


GL1000 (75-76)     22-22-1011    $37.95

GL1000 (77-79)      22-22-1004    $28.95


22-22-1011      = SSH-750     26 x 48.5 x 15.2     30 x 50 x 14.4     $37.95


22-22-1004      = SSH-901     25 x 47 x 15               30 x 55 x 17     $28.95

[dusterdude]

For the wheel,  you will need the GL rotors, rotor bolts, spacer, speedo drive and axle.  These should work with a 750 wheel since the hubs are identical, however the GL wheel uses a nice lightweight alloy DID rim so you might consider getting the entire assembly.  You will also need the GL calipers as they are completely different (this is a good thing) from the 750 pieces.  For reference heres a pic of the GL1000 front end on my 78750K. Note that stock GL rotors don't look like swiss cheese.

eric,who drilled your rotors?

[dgfischer]

I thought that the stem was identical to the SOHC 750 stem?  Shouldn't this mean that the tapered bearing kit for the 750 would work fine for the conversion?

 They are and it does.
   The Allballs 1004 kit may come with a 26 -47-15 bearing with an adaptor for the 25mm stem (for the GS). I dont know. The height difference could be made up with a shim/washer under/over the bearing. K&L Cycle shows 2 different sets for the 82 GS 750 and the 78 GL 1000. Pro-flo shows both bikes using the same kit.
 The sizes I listed come from a K&L catalogue. They have a web site but all it shows are their expensive tools.

[eurban]

For the wheel,  you will need the GL rotors, rotor bolts, spacer, speedo drive and axle.  These should work with a 750 wheel since the hubs are identical, however the GL wheel uses a nice lightweight alloy DID rim so you might consider getting the entire assembly.  You will also need the GL calipers as they are completely different (this is a good thing) from the 750 pieces.  For reference heres a pic of the GL1000 front end on my 78750K. Note that stock GL rotors don't look like swiss cheese.

eric,who drilled your rotors?

Got em a good while back from a fellow on ebay. I was about to do the drilling myself when they appeared before me while browsing.  Holes are a bit larger than what I would have done but the pattern is precise, they are chamfered, and they work well.  Much lighter compared to an undrilled rotor too.  . . . .

[Jim F]

Thanks for all your help guys

I have bought a complete front end (piece by piece) on E-bay
for under $300 bucks
got the front wheel D.I.D rim complete with rotors, axles, spacers, 100.00

2 sets of calipers for 45.00

a set of forks for 75.00 with trees

still looking for speedo but should be easy to find

thanks again and will start posting pictures soon

Jim

[Jinxracing]

Jim, I've got a '75/'76 GL1000 speedo drive that I won't be using. Is that what you're looking for or the actual speedometer? If you can use the drive I'd be happy to trade it for a little aluminum welding. I've also got a master cylinder (needs a rebuild) that I will be getting rid of too...decided to go with a later model MC.

Good price on those calipers btw...did they come with the brackets?

[eurban]

Hope the bolts holding your caliper halves together aren't as badly locked as some of the ones that I came across.  Also the caliper pistons are often rusted to sh**. . . . Have fun!