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Author Topic: 1980 CB650C Bobber Project  (Read 4603 times)

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rayray2316

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1980 CB650C Bobber Project
« on: August 30, 2009, 08:13:02 AM »
I bought this little thing for $200 to make a bobber.  I haven't rode for 27 years.  Kids, house, job all that kind of stuff.  When I was 5 years old, my dad came home with a Harley, stuck me on the front, flew down the street and I was hooked.  So, 36 years later, I'm ready to start my build.  Then, I realized that a starter project Harley was going to set me back $3-4000 just get started.  I found the Honda and want to build it and see how it goes.

This is my first build.  I've never worked on a bike.  The bike runs but it idles extremely high and when I pull the clutch in the RPMs skyrocket.  I'm tearing it apart to clean it up and clean out the carbs. 

Here's some pictures and I will keep posting as I progress.

Any and all suggestions are appreciated.





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rayray2316

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Re: 1980 CB650C Bobber Project
« Reply #1 on: August 30, 2009, 03:53:06 PM »
Today, I pulled the motor, cleaned it.  I went to Harbor Freight and bought their little four wheel dolly for $10.  I also noticed during pulling the motor that the stupid bolt that holds the oil filter cover was stripped.  While I was at Harbor Freight I picked up a cool set of bolt extractors.  Got it cleaned up.  Ready to rock and roll.  I will post more pictures later.

If anybody can help me.. when I first started this project, as I stated above, when I rode it it idled high and when I pulled the clutch in the RPMs went through the roof.  Does anybody have any ideas on what this could be?





I'm really happy with how clean the motor came out.  It was pretty oily and nasty prior to that.  A brush and some Simple Green and a little water - I'm quite happy.




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Offline checkflag

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Re: 1980 CB650C Bobber Project
« Reply #2 on: August 30, 2009, 09:26:13 PM »
is it just me, or is your frame missing an integral part of tubing that supprts the engine?
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1979 cb650. Mac 4-1 exhaust. Soon>> cb750 carbs.

rayray2316

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Re: 1980 CB650C Bobber Project
« Reply #3 on: August 30, 2009, 10:04:54 PM »
No your right, I found this when I took the engine out. Honda made that side of the frame removable. Really handy I gotta say.
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Offline checkflag

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Re: 1980 CB650C Bobber Project
« Reply #4 on: August 31, 2009, 01:35:03 AM »
very interesting indeed.
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1979 cb650. Mac 4-1 exhaust. Soon>> cb750 carbs.

Offline kerryb

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Re: 1980 CB650C Bobber Project
« Reply #5 on: August 31, 2009, 07:28:54 AM »
Welcome Ray.  You started like I did.  Keep reading this site, Lots of good people here.
For the Idle, did you start by checking the high idle adjust, the choke, and the throttle cables first.  My 750 has a finger adjust knob you can reach from the seat, for the idle.
Someday I hope to start a thread on my 750k hardtail bobber project.
« Last Edit: September 01, 2009, 04:05:06 AM by kerryb »
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intrigued by the wail...seduced by the scream.

Offline The_Crippler

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Re: 1980 CB650C Bobber Project
« Reply #6 on: August 31, 2009, 08:00:37 AM »
Welcome to the forums, buddy.  I'm working on the same year and model myself, as well as thinking along the bobber lines.  (Though, I'm leaning more and more towards a "bobbed cafe.")

Quote from: rayray2316 on August 30, 2009, 10:04:54 PM
No your right, I found this when I took the engine out. Honda made that side of the frame removable. Really handy I gotta say.

The important part is...you have that piece, right?
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rayray2316

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Re: 1980 CB650C Bobber Project
« Reply #7 on: September 01, 2009, 10:13:05 PM »
I put the motor back in tonight.  Looking forward to continuing.



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rayray2316

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Re: 1980 CB650C Bobber Project
« Reply #8 on: September 02, 2009, 05:27:35 PM »
Hey fellas, I gotta question. When I remove the shocks and lower the frame to get strut measurements the brake rod robs on the frame. Anybody ever deal with this and what can I do. I thought about shorting the rod, but unsure if I should.
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Offline 750goes

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Re: 1980 CB650C Bobber Project
« Reply #9 on: September 02, 2009, 05:36:09 PM »
I might be totally wrong, but I think your brake pivot arm at the hub is mounted upside down, I believe the brake rod should be down where the torsion arm is..

I'll try and find a picture and link to this topic..

good work so far..

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Offline 750goes

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Re: 1980 CB650C Bobber Project
« Reply #10 on: September 02, 2009, 05:40:50 PM »
No , sorry, your setup is correct...

Why not bend the rod ??
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Offline 750four

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Re: 1980 CB650C Bobber Project
« Reply #11 on: September 02, 2009, 05:41:26 PM »
it is upside down, but it should still work. As long as it turns to open up the drum pads.
"Drum pads"? wow I can't remember what there called at all!!!....
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Offline tonycb650

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Re: 1980 CB650C Bobber Project
« Reply #12 on: December 11, 2009, 05:46:32 PM »
Drum pads = brake shoes ;) High idle problem sounds like you just need to sync your carbs.
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80cb650c 80 cm400

Miller

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Re: 1980 CB650C Bobber Project
« Reply #13 on: February 27, 2010, 06:19:21 PM »
Quote from: checkflag on August 30, 2009, 09:26:13 PM
is it just me, or is your frame missing an integral part of tubing that supprts the engine?

Funny...I purchased the same bike for $100 first bike, got ambitious with a friend one night after riding it up and down the alley, to try and pull the engine and fix an oil leak (a first for me, didn't even own a full socket set, I'll blame the Highlife)...We failed to realize that frame piece came out, and ended up using a grinder to get the motor out...oops...lol guess I'll be fab'ing up a bracket of some sort.  I am currently in the process of opening up the top end of the motor...figured I should read about it so I can avoid using my grinder..that sht get's expensive
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