Author Topic: 81 cb650c vs cb650 (Read 7916 times)

bikerboycb650 · « **on:** August 05, 2008, 06:31:03 PM »

Is there a big difference betweem the cb650c and just a cb650? (81)

tomkimberly · « **Reply #1 on:** August 05, 2008, 07:59:20 PM »

Yes, the 650C has dual front disk brakes and 4 into 4 exhaust.

Tom

bikerboycb650 · « **Reply #2 on:** August 06, 2008, 05:20:39 AM »

oh, ok. Most of the parts interchangeable? (given the same year)

Frankenkit · « **Reply #3 on:** August 06, 2008, 06:59:34 AM »

I'm afraid I can't confirm the dual disc setup on the '81 custom... just haven't seen any with it... but maybe that's just me. Most parts should be interchangeable.

tomkimberly · « **Reply #4 on:** August 06, 2008, 07:04:57 AM »

Yes, most parts are identical. All engine, carb, and electrical are the same.

If you are having carb problems see if you can locate a set of VB44 B or VB44 C, both of these have screw in and replaceable idle jets. These were used on the 82 models and will be one of the best upgrades you can do.

Tom

Hush · « **Reply #5 on:** August 06, 2008, 08:52:13 AM »

Mine's a 79 650z and I have double front discs.

kslrr · « **Reply #6 on:** August 06, 2008, 09:14:57 AM »

Another difference is that the cb650c has an 18" front with dual disk and a 16" rear rim, while the '79 cb650 has a 19" front with single disk and a 17" rear. I have parts from both so my 650c has the 18" dual disk up front and the "17 rear. There are also carb and engine top end differences between the years '79-'80, '81-'82.

heffay · « **Reply #7 on:** August 06, 2008, 10:23:28 AM »

kslrr... did you see my carb kit thread?

what difference exactly are there with the carbs, if you know off the top of your head or if your carbs are handy.

kslrr · « **Reply #8 on:** August 06, 2008, 10:53:59 AM »

I found your carb kit thread. Looks like you got some answers so far.

What I see in the package (of the RED arrowed items) is a new main jet, which screws into the emulsifier tube, and a new idle jet which presses in. I have both a '79 engine (in the '81 frame) and the '81 engine (with thrown chain damage). The Kester kits that I ordered from Z1 for the '79 carbs did not contain a new emulsifier nor an idle jet. The carb kit for the '81 SOHC 650 on Z1 Enterprises looks very much like what you have from ToonMax.

heffay · « **Reply #9 on:** August 06, 2008, 11:27:27 AM »

can you see that smaller emulsion tube?
any idea what its for?

if i was at my home computer i could post a pic... sorry

kslrr · « **Reply #10 on:** August 06, 2008, 02:10:09 PM »

What looks like a small emulsion tube is the slow/idle jet I believe. Just last weekend I pulled the slow/idle jets out of my '79 carbs, and that is what they look like. A closer look at the Kester Kit on Z1 looks like the slow/idle jet is threaded. Here is a pic of the Z1 kit.

heffay · « **Reply #11 on:** August 06, 2008, 02:46:56 PM »

ok, so where is the slow idle jet? what i find in these cv carbs is one removeable main and the others look pressed or there is just a hole.
i have no manual for the carbs as the one we have hosted here is not for the cv carbs. $:-\$
i admit, i have yet to remove the top caps thinking there would not be any removable parts up there, but the slow idle jet i can not find in these carbs.
what are the orings for? dismantling the rack?
z1 kit looks exactly the same... so maybe i shouldn't return these and use what i can?
thanks for the use of your thread, boy650

MJL · « **Reply #12 on:** August 06, 2008, 02:47:10 PM »

Quote from: Kitsune84 on August 06, 2008, 06:59:34 AM

I'm afraid I can't confirm the dual disc setup on the '81 custom... just haven't seen any with it... but maybe that's just me. Most parts should be interchangeable.

Do you want a pic of mine?

Frankenkit · « **Reply #13 on:** August 06, 2008, 02:48:29 PM »

I'm just feeling really weird about my bike now... It's a 1980 CB650 and both the side badges say 'custom' but it's got the 19" front and a 17" back... single disc up front... d'oh! The badges, how they lie!

heffay · « **Reply #14 on:** August 06, 2008, 02:50:32 PM »

Quote from: Kitsune84 on August 06, 2008, 02:48:29 PM

I'm just feeling really weird about my bike now... It's a 1980 CB650 and both the side badges say 'custom' but it's got the 19" front and a 17" back... single disc up front... d'oh! The badges, how they lie!

what does the steering neck say? model?

heffay · « **Reply #15 on:** August 06, 2008, 02:55:49 PM »

weird beard... just the info list this thread was asking for, nice!

MJL · « **Reply #16 on:** August 06, 2008, 02:56:31 PM »

Triple clamps were mentioned, I know that the triples are different between the single disc and dual disc front, the dual disc being wider by about 3/8 inch IIRC. Also, the Custom has a shield or visor or something over the gages. Kinda like a micro windscreen, but solid black.

heffay · « **Reply #17 on:** August 06, 2008, 02:59:21 PM »

hey weirdy and kslrr... i think you guys just saved me a needless return of 4 carb kits. i actually thought i might be going crazy w/ matching parts and other parts that were simply not there.

<crazy goggles

cb650 · « **Reply #18 on:** August 06, 2008, 03:51:31 PM »

Both my USA 81 customs with dual disk have 19" front wheels. All my 650s have had 19". The triple clamps are wider for the dual disk bikes.

tonycb650 · « **Reply #19 on:** August 06, 2008, 06:40:47 PM »

Kitsune, our 80 model customs should have 19 front single disc and 16 rear. heffy, the slow jets are pressed in and according to honda are not removable, but they can (and should ) be removed with a pair of pliers by pulling straight up and twisting slightly. one of the small o-rings, the small washer, and the spring go on the idle screw. one of the o-rings (medium one i think) goes between the carb body and the float bowl at the passage where gas goes from the acc pump to the 4 squirters in the carbs.(believe me you need this o-ring , dont ask me how i know.)

Frankenkit · « **Reply #20 on:** August 10, 2008, 10:49:58 AM »

Yeah, I thought I was going nuts, then looked up the parts fiche- the 81s are D.D.... Bummer that we missed out on all that extra braking power by a year!

...and yeah, I had an adventure with those o-rings, too. They are VERY necessary.

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Author Topic: 81 cb650c vs cb650 (Read 7916 times)