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Discussion Starter #1
i'm looking for spokies for a '79 CB750K. can anyone tell me what would work...i dunno what's compatible!
 

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quote:
i'm looking for spokies for a '79 CB750K. can anyone tell me what would work...i dunno what's compatible!
arrgh JUST WROTE a really long repy and my browser crashed and erased it. I hate computers.

In short: Your bike should have come with spokes from the factory, so you can just look for 1979 K bike rims. I am not 100% sure the 77-78 SOHC rims would work but I get the feeling they might.

What kind of mags do you have? Lesters or comstars? A lot of dealers switched spoke rim bikes to comstars from C bikes or later model K bikes to make tire changes easier (no tubes) or to run dual front disc brakes. With a DOHC you won't be able to run dual disc front brakes on a spoke rim.

If you have lester mags I can probably find a set of rims to swap you, if you have comstars I have too many already. Are you running rear disc or rear drum? If you have rear disc then someome converted your rear to a Supersport rear (F bike).

Do you really want to go back to tubed tires? With later comstars (like the cb1100F rear rims) you can run up to a 160 rear tire, or you can convert more easily to disc rear brakes and dual front brakes. Technology wise the switch from mags to spokes always feels like a backward step to me.

Let's see a picture of your bike so se what you are dealing with.
 

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quote:
i'm looking for spokies for a '79 CB750K. can anyone tell me what would work...i dunno what's compatible!
arrgh JUST WROTE a really long repy and my browser crashed and erased it. I hate computers.

In short: Your bike should have come with spokes from the factory, so you can just look for 1979 K bike rims. I am not 100% sure the 77-78 SOHC rims would work but I get the feeling they might.

What kind of mags do you have? Lesters or comstars? A lot of dealers switched spoke rim bikes to comstars from C bikes or later model K bikes to make tire changes easier (no tubes) or to run dual front disc brakes. With a DOHC you won't be able to run dual disc front brakes on a spoke rim.

If you have lester mags I can probably find a set of rims to swap you, if you have comstars I have too many already. Are you running rear disc or rear drum? If you have rear disc then someome converted your rear to a Supersport rear (F bike).

Do you really want to go back to tubed tires? With later comstars (like the cb1100F rear rims) you can run up to a 160 rear tire, or you can convert more easily to disc rear brakes and dual front brakes. Technology wise the switch from mags to spokes always feels like a backward step to me.

Let's see a picture of your bike so se what you are dealing with.
 

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Discussion Starter #6
...dammitt!!!

could somebody throw me a bone and tell me how to post an image!
 

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Discussion Starter #7
...dammitt!!!

could somebody throw me a bone and tell me how to post an image!
 

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Discussion Starter #8
they're comstock mags. i'd be more inclined to keep lesters.

drum rear, single disc front. i'm not that eager to go rear disc or double up front. i don't mind tubes.

...besides, spokes look so much better!!!
 

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Discussion Starter #9
they're comstock mags. i'd be more inclined to keep lesters.

drum rear, single disc front. i'm not that eager to go rear disc or double up front. i don't mind tubes.

...besides, spokes look so much better!!!
 

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GL1000 front end swap. Nice spokes with twin discs. That's what you'll want once you've installed the turbo.
 

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GL1000 front end swap. Nice spokes with twin discs. That's what you'll want once you've installed the turbo.
 

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GL1000 front end swap. Nice spokes with twin discs. That's what you'll want once you've installed the turbo.
not really...while the GL1000 swap is ideal for a SOHC because it is totally a bolt it, for the DOHC it is not as simple and frankly it is old technology. What is great about the DOHC bikes is that motorcycle brakes took a huge leap forward while the DOHC bike was in prodcution. The GL1000 front end is heavy, very heavy, but it is basically the only commonly available option for a SOHC bolt on dual disc while retaining a speedo drive. The DOHC front ends do not bolt on the SOHC so the first year GL1000 swap is basically it.

At one point I owned a 1979 and a 1982 cb750F. Identical bikes, identical engine performance, identical weight but the later had improved brakes and rear shocks. With me riding both in the same day the 82 stopped way better than 79. The reason is that the 79 had single hockey puck calipers while the 82 had twin piston tokico calipers.

The best brake setup irrespective of rims for any DOHC cb is the 1982/83 cb1100F front end: 39mm tubes (lighter than the GL1000 and 2mm bigger) and the heavy duty tokico twin calipers. Some of the later 750s and early 900s have 37mm tubes which is the same size as a gl1000 and have the heavy duty calipers. The only down side is you are stuck with a comstar. Some of the K bike comstars are larger than the C bike comstar (18" rather than 16"), and the same goes for the spoke rims (first year customs came with spoke rims also).

I head some old timers talk about using gs750 (1977-1978) rear swingarm and rim to do a rear spoke conversion with a disc brake. I have not tried it but I have a 1977 GS with a rear disc spoke rim, if you want me to take measurements I can.

Also since you are asking about cb750 DOHC upgrades, the 900s came with an oil cooler from the factory that should retrofit to the 750.

now If I was going to built the ultimate K bike DOHC (money no object, performance the ultimate goal) I would start with a cb750F frame (stronger and better braced) and a cb1100F engine, cb1100F aluminum rear swingarm, rim, and disc brake setup (with 160 rear tire) and a 1982 cb1100F front end and stock K bike bodywork.

Turbo kits for the DOHC are commonly available in europe, although the US market for it has dried up. I have ridden a turboed cb900 once and it was a monster with no street manners whatsoever, but when you carry that big of a stick who needs manners.



Edited by - geeto67 on Aug 11 2006 3:43:39 PM
 

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quote:
GL1000 front end swap. Nice spokes with twin discs. That's what you'll want once you've installed the turbo.
not really...while the GL1000 swap is ideal for a SOHC because it is totally a bolt it, for the DOHC it is not as simple and frankly it is old technology. What is great about the DOHC bikes is that motorcycle brakes took a huge leap forward while the DOHC bike was in prodcution. The GL1000 front end is heavy, very heavy, but it is basically the only commonly available option for a SOHC bolt on dual disc while retaining a speedo drive. The DOHC front ends do not bolt on the SOHC so the first year GL1000 swap is basically it.

At one point I owned a 1979 and a 1982 cb750F. Identical bikes, identical engine performance, identical weight but the later had improved brakes and rear shocks. With me riding both in the same day the 82 stopped way better than 79. The reason is that the 79 had single hockey puck calipers while the 82 had twin piston tokico calipers.

The best brake setup irrespective of rims for any DOHC cb is the 1982/83 cb1100F front end: 39mm tubes (lighter than the GL1000 and 2mm bigger) and the heavy duty tokico twin calipers. Some of the later 750s and early 900s have 37mm tubes which is the same size as a gl1000 and have the heavy duty calipers. The only down side is you are stuck with a comstar. Some of the K bike comstars are larger than the C bike comstar (18" rather than 16"), and the same goes for the spoke rims (first year customs came with spoke rims also).

I head some old timers talk about using gs750 (1977-1978) rear swingarm and rim to do a rear spoke conversion with a disc brake. I have not tried it but I have a 1977 GS with a rear disc spoke rim, if you want me to take measurements I can.

Also since you are asking about cb750 DOHC upgrades, the 900s came with an oil cooler from the factory that should retrofit to the 750.

now If I was going to built the ultimate K bike DOHC (money no object, performance the ultimate goal) I would start with a cb750F frame (stronger and better braced) and a cb1100F engine, cb1100F aluminum rear swingarm, rim, and disc brake setup (with 160 rear tire) and a 1982 cb1100F front end and stock K bike bodywork.

Turbo kits for the DOHC are commonly available in europe, although the US market for it has dried up. I have ridden a turboed cb900 once and it was a monster with no street manners whatsoever, but when you carry that big of a stick who needs manners.



Edited by - geeto67 on Aug 11 2006 3:43:39 PM
 

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Discussion Starter #16
again, thanks for your help, geeto67! you should charge a service fee!

don't rush over to measure that wheel on my account...not just yet anyway!
 

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Discussion Starter #17
again, thanks for your help, geeto67! you should charge a service fee!

don't rush over to measure that wheel on my account...not just yet anyway!
 

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geet, waddya give me for a nos set of lesters?? unmounted, and unpainted??

jc
 
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