Topic: CB650 Frame info needed

[sos141]

Hey you SOHC/4 gurus!  I am considering building a bike based on a CB650.  Does anyone know if the differences between the standard and custom 650 models were all cosmetic/bolt-on, or if there were any actual frame/swingarm dimensional differences between the two?  Were the 1979-1981 frames all the same?  Thanks for any help.  Jim.

[scunny]

according to my manual all frames are the same, some changes to suspension components,gear box ratios and bits and pieces depending on model. Hope that helps

[sos141]

Exactly the info I was looking for.  Thanks!!

[cb650]

79 was a diffrent frame.    82 nitehawk (replaced custom) was a little diff also.




          Terry

[Robert]

Yup.
There are some differences between the 1979 - ... and the 80/81 custom models as well. I remember especially the swingarm and it's bushings etc. beeing different (size) as well as the fork diameters, frame geometry caster angle etc.

[dusterdude]

i believe my clymers manual shows a different neck rake for a custom also.

[cb650]

The rake was diff for the nitehawk.  The 79 still had a flip up seat rest bolted on. 79 battery slid in from the side rest dropped in from under seat so the air box/filter was diff.  Forks where same except for the 81 CUSTOM & 82 NITEHAWK as they went to trailing axles with air assist.



                 Terry

[dusterdude]

The rake was diff for the nitehawk.  The 79 still had a flip up seat rest bolted on. 79 battery slid in from the side rest dropped in from under seat so the air box/filter was diff.  Forks where same except for the 81 CUSTOM & 82 NITEHAWK as they went to trailing axles with air assist.



                 Terry

terry,thats it,mine has the trailing axle and air fork.

[cb650]

I'm curios if the 81/82 standards had these also. Dont think they did.  I know they stayed with the single disk. Dad had a 82 standard but sold it and got a magna before this obsession started.



                             Terry