Author Topic: new help figure out (Read 1927 times)

suprafabs · « **on:** June 13, 2016, 04:27:32 PM »

im new to these bikes.
tittle says bike is an 1978 cb750, bike had an early model oil tank fitted ok, I bought a oil tank from an 1978 cb750 and doesn't fit!! oil tank is wrong or bike year is wrong?

one pic is with out oil tank, other is with a 1978 tank( was able to attach one screw) nothing else fits

does anyone know how how to tell what year based on the frame?
i didn't see any frame mods, no new welding no shaved brackets...

Stev-o · « **Reply #1 on:** June 13, 2016, 04:39:32 PM »

What is your frame number? It could be a '76 frame, sold and titled as a '77.

However, I see you have a 17" rear tire which also points towards a '77.

The bike is 40+ years old, who knows what parts have been changed out?!

suprafabs · « **Reply #2 on:** June 13, 2016, 04:46:55 PM »

i drilled out the rivets that holds plate and no numbers there,

plate with rivets says 1978

Scott S · « **Reply #3 on:** June 13, 2016, 04:49:06 PM »

Why in the world did you remove the VIN plate

That could potentially cause big headaches for someone in the future or at the DMV.

suprafabs · « **Reply #4 on:** June 13, 2016, 04:51:03 PM »

all frames should be engraved! no? I can always rivet the plate back.

Stev-o · « **Reply #5 on:** June 13, 2016, 06:13:21 PM »

The frame is stamped on the other side of the steering head.

Are you certain that tank is for a CB750?

scottly · « **Reply #6 on:** June 13, 2016, 06:17:10 PM »

The VIN should be stamped on the left side, not underneath the plate. (edit: Steve beat me to it)
Here is a pic showing the oil tank mounting tabs on a K7 frame. Also, the seat hinges are on the left side of the K7 frame.

ekpent · « **Reply #7 on:** June 13, 2016, 06:24:01 PM »

Let us have a bigger peek of your whole bike, the gas tank does not look like an early 750 K.

suprafabs · « **Reply #8 on:** June 13, 2016, 06:58:30 PM »

no, gas tank is from a 78 for sure.

on the left i seen the stamp according to the number, its a 76 750K, motor is from a 1978 750k..

what should i do? should i get a frame with matching tittle and swap everything back? or just leave it alone? because right now, tittle matches motor not frame. i ran the vin on the frame, not stolen nor salvage.

Tews19 · « **Reply #9 on:** June 13, 2016, 07:15:44 PM »

Lots of titled Honda CB's are on the engine. Don't worry about it. As Ekpent stated let's see the whole bike. The tank does not look like a 77-7 frame. Also if it's the original red it may be a 76 tank.

suprafabs · « **Reply #10 on:** June 13, 2016, 07:53:33 PM »

here it is

Tews19 · « **Reply #11 on:** June 13, 2016, 07:56:00 PM »

Tank is 77-78. Carbs are as well.

scottly · « **Reply #12 on:** June 13, 2016, 08:05:48 PM »

Some states use the frame VIN for the title, some use the engine, and some use both. The K8 plate attached to a K6 frame is fraudulent, if the K8 frame VIN is shown on the title. Depending on your state, it might not be an issue, but in some it could result in confiscation and /or criminal charges if the K6 numbers had been ground off the frame.

Stev-o · « **Reply #13 on:** June 13, 2016, 09:21:49 PM »

Just leave it, good looking bike.

Why were you changing the oil tank?

mrbreeze · « **Reply #14 on:** June 13, 2016, 11:28:35 PM »

You said you have a 76K frame with a 78K engine. Something was done with your drive chain. 77-78 are different from earlier K's. 77-78 had 630 chains and older had 530. It could be offset counter sprocket or rear hub. Stevo pointed out you have a 17" rear so that's 77-78. Also you have a 77-78 front fender. You said it came with an earlier oil tank and you replaced it with the one pictured that doesn't fit. Here are pics of a 75 K oil tank and frame. If you have a 76K frame this is the tank you need.
And another thing................which size chisel did ya use to drill the rivets out of the VIN tag?

?

suprafabs · « **Reply #15 on:** June 14, 2016, 02:55:19 AM »

Im short, and earlier tank seemed bulkier, so i figured if i changed it, i would burn my legs less, but i guess i will have to settle for older style. thanks for the help guys.

ekpent · « **Reply #16 on:** June 14, 2016, 04:16:12 AM »

Rear fender is an earlier k, front end later. Kind of a mish mash of different parts. Looks pretty good though.

Stev-o · « **Reply #17 on:** June 14, 2016, 06:21:37 AM »

I hereby name your bike "FrankenBike"!

No offense intended, it looks good.

madmtnmotors · « **Reply #18 on:** June 14, 2016, 07:40:02 AM »

The seat hinge brackets on the frame are not 77/78 K. You have an earlier frame. The VIN plate should match the number stamped on the other side of the neck. Florida uses the number on the frame.

suprafabs · « **Reply #19 on:** June 14, 2016, 03:49:08 PM »

lol Im ok with that, I just hate when sh*T don't match up, drives me nuts. but for now will stay, when i tear down, i might just buy a frame with tittle and convert everything over.

Tews19 · « **Reply #20 on:** June 14, 2016, 04:07:47 PM »

Contact your dmv. They most likely will change over the title to the frame if on engine or engine depending which unit is titled. I did this with my 550.

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Author Topic: new help figure out (Read 1927 times)