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Offline Bosgarage57

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78 750K
« on: July 22, 2014, 06:50:28 PM »
Hey guys, new owner of a bike that's had a pretty hard life.

Bought it from a friend, its a 78 without a title. Will be getting all the paper work done to get a title.

also where in the heck is the VIN on these bikes?  Ive found the motor # and frame # on the neck, but the actual VIN I cannot locate.

He said that he got it started recently and was able to drive it around, but it will not kick start, like its.......seized, I hope not, but the kickstart wont budge.

he said there was a diagram somewhere saying that only needed 5 wires for the bike to run.....anyone know where I may find this?

Im afraid its going to need a lot more work but I'd first like to see if the motor is seized or not before I begin actually thinking I have an amazing bike :)

« Last Edit: July 23, 2014, 05:50:15 AM by Bosgarage57 »
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1978 CB750K

Offline Davidov

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Re: 78 750E
« Reply #1 on: July 22, 2014, 07:14:53 PM »
Quote from: Bosgarage57 on July 22, 2014, 06:50:28 PM

He said that he got it started recently and was able to drive it around, but it will not kick start, like its.......seized, I hope not, but the kickstart wont budge.

he said there was a diagram somewhere saying that only needed 5 wires for the bike to run.....anyone know where I may find this?

The kick start lever should have some resistance, but it should definitely turn the engine.

http://www.hondachopper.com/garage/simple_wiring_diagram/simple_wiring_diagram.html
Maybe like this?

Also, 750E is not a specific model. You are probably looking at the Engine serial number, which starts with CB750E---------.

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-David

Offline Bosgarage57

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Re: 78 750K
« Reply #2 on: July 23, 2014, 05:51:43 AM »
David, you were correct, engine is 750E, Neck Frame says 750K.  Where can I locate the VIN for the bike? I cant seem to find her.  Thanks for that link I'll check it out.  I was able to get a battery hooked up to it and it turned over, so no seized motor wooo hoo.
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1978 CB750K

Offline Davidov

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Re: 78 750K
« Reply #3 on: July 23, 2014, 08:46:54 AM »
Quote from: calj737 on July 23, 2014, 06:15:35 AM
The actual VIN is stamped on the neck. What you are reading is the bikes VIN. Engine numbers and frame VINs aren't sequenced together. Left side of neck has engraved VIN. Right side should have a riveted on plate with production dates and serial number (which should match).

The number on the neck is what needs to be on the title. The US didnt require a 17 digit VIN (like all modern cars have) until 1980 or 1981.
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Offline Mr Freeze

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Re: 78 750K
« Reply #4 on: July 23, 2014, 11:05:05 AM »
The VIN will be stamped on the left hand side of the steering neck opposite of the 1978 model badge. The kickstarter should make the engine turn over if it's not seized. If you really can't budge it, then you might have a stuck cylinder.
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Offline martin99

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Re: 78 750K
« Reply #5 on: July 23, 2014, 02:43:11 PM »
I like the look of your bike.

Make sure it's not in gear before you try to kick it - just sayin', we've all done it ;)
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Build threads:
77 750F2 Refresh Project http://forums.sohc4.net/index.php?topic=144075.0
TRIBSA http://forums.sohc4.net/index.php/topic,160296.0.html

1977 CB750 F2
1958 Norton Model 99
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Offline Bosgarage57

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Re: 78 750K
« Reply #6 on: July 23, 2014, 03:06:56 PM »
Thanks everyone, so when I request a new title I'll use the #s on the neck...CB750K blah blsh. Its only 13 digits

The bikes in neutral as I was able to get it rolled up onto our ramp. I'm thinking what mr freeze said...stuck cylinder. We had to use wd40 just to get the kickstand to pivot to try to kick.

Little by little I'll get it sorted, hopefully.

Thanks again everyone.
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1978 CB750K

Offline Bosgarage57

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Re: 78 750K
« Reply #7 on: July 23, 2014, 05:41:26 PM »
Got the kickstart to go down, I don't believe I tried it last night when I was able to get the engine to crank maybe that free'd it up.

got the carbs off and one of them is some white stuff, milky. 

What do you guys use to soak your carbs? A friend of mine told me to use original Pine-Sol, helps with rubber and everything.
« Last Edit: July 23, 2014, 05:44:03 PM by Bosgarage57 »
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1978 CB750K

Offline BobbyR

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Re: 78 750K
« Reply #8 on: July 23, 2014, 06:27:21 PM »
Simple Green at 100% for an hour dissolves most of the crap. Never used Pine Sol but if you have some try it.
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Offline Thamuz

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Re: 78 750K
« Reply #9 on: July 23, 2014, 07:06:24 PM »
+ on simple Green. do not heat it up!  It will take not only the crud off, but discolor the carbs.  I hade it remove all sorts of varnish and oil/lube residue.
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1979 Yami Chopper XS1100s
1978 CB750k
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1974 CB550k
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Offline Bosgarage57

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Re: 78 750K
« Reply #10 on: July 23, 2014, 07:14:36 PM »
I've used simple green before as well with good results, but a friend swears by PineSol, and is much cheaper and ok on rubber.  He showed me some carbs from his dirtbike and they looked brand stinking new. 
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1978 CB750K

Offline flybox1

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Re: 78 750K
« Reply #11 on: July 24, 2014, 12:57:50 PM »
Im sure they looked great after a Pinesol bath...because it stripped the outer metal layer off the carbs  :o
Its much more acidic than simple green.  Pinesol is not recommended.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline Bosgarage57

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Re: 78 750K
« Reply #12 on: July 24, 2014, 02:24:50 PM »
interesting, thank you flybox for that. I'll mention it to him and see his reaction.
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1978 CB750K

Offline Bosgarage57

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Re: 78 750K
« Reply #13 on: July 25, 2014, 04:05:09 PM »
My carbs have the screw in top, I was wondering if I could replace the whole carb with carbs from a 77 cb750k???
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1978 CB750K

Offline Vinhead1957

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Re: 78 750K
« Reply #14 on: July 26, 2014, 04:50:08 AM »
The vin number has the model number prefix on the neck. But make sure that you list the model with it. I had trouble in ME every time I go in for inspection.  It has to match exactly to the registration. I kept telling the guy it is the model#. It is not part of the vin. Finally, I went to the registry and had it added to the reg#.
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