Author Topic: CAN'T IDENTIFY ENGINE... (Read 5174 times)

revjim · « **on:** February 01, 2008, 06:47:01 AM »

I have a 750 but the serial number is marred beyond description...how do I know what gasket sets, carb sets etc. to buy. Thanks.

SteveD CB500F · « **Reply #1 on:** February 01, 2008, 06:57:55 AM »

Tell us what the frame / VIN number is and post some clear photos.

We'll do our best.

Gordon · « **Reply #2 on:** February 01, 2008, 06:59:26 AM »

You should have a VIN stamped on the left side of the steering head as well as a VIN plate on the right side. There should also be an engine number stamped on top of the case under the carbs. Are all of these unreadable?

revjim · « **Reply #3 on:** February 01, 2008, 06:59:40 AM »

thanks....this is an old beat up engine...in an amen frame. no serial numbers. SOHC is all I know...It is frozen up, so slowly taking it a part. rebuilding carbs and top end...If I gave you a pic of carbs would you be able to tell me what year? Thanks.

revjim · « **Reply #4 on:** February 01, 2008, 07:00:47 AM »

I was typing while you were typing last post...The only number I checked was above the Clutch lever...where are the others? Thanks.

Gordon · « **Reply #5 on:** February 01, 2008, 07:02:26 AM »

Quote from: revjim on February 01, 2008, 07:00:47 AM

The only number I checked was above the Clutch lever...

OK, now I'm really confused...

How about just a couple of pictures of the whole engine.

Cvillechopper · « **Reply #6 on:** February 01, 2008, 07:17:51 AM »

Quote from: Gordon on February 01, 2008, 07:02:26 AM

Quote from: revjim on February 01, 2008, 07:00:47 AM
The only number I checked was above the Clutch lever...

OK, now I'm really confused...

How about just a couple of pictures of the whole engine.

+1
The serial number will be on the top side of the case, below the carbs, with a slightly raised rectangle around it. Using the carbs to identify the engine would be messy, especially since you don't know what they did when they put it into teh Amen frame. Could have different carbs, an overbore kit, etc.

revjim · « **Reply #7 on:** February 01, 2008, 07:23:35 AM »

the number in the rectangle is unreadable...what now

Gordon · « **Reply #8 on:** February 01, 2008, 07:27:45 AM »

Quote from: revjim on February 01, 2008, 07:23:35 AM

the number in the rectangle is unreadable...what now

Pictures of the engine.

754 · « **Reply #9 on:** February 01, 2008, 07:44:36 AM »

Start looking for new cases, that look like the ones you have..

If you want to ride on the street its not worth putting any work into it only to have it confiscated when you get pulled over or go to register it,

Meanwhile, is there a spot on the shifter cover that has a shift pattern cast into it? When you look at the head from the outside edge is there 3 bars between the fins or 4?

revjim · « **Reply #10 on:** February 01, 2008, 07:53:42 AM »

revjim · « **Reply #11 on:** February 01, 2008, 07:56:13 AM »

how do you post pics...I can't find a FAQ tutorial on the website

dustyc · « **Reply #12 on:** February 01, 2008, 07:59:42 AM »

Sign up for a Photobucket.com account. You'll be able to link the pictures from that. They have to be hosted on the internet. It's not like attaching a photo in an email.

There will be a button under the pic when it's on Photobucket that says IMG code. Click that, then the address for the pic will be copied, then in your post here, left click and paste the address and the pic will show up in your post.

You can preview your post before you submit it to make sure the pic is what you want it to be.

Isn't the engine number stamped somewhere else on the engine guys? Or am I wrong about that?

SteveD CB500F · « **Reply #13 on:** February 01, 2008, 08:13:10 AM »

Forum FAQ id here: http://forums.sohc4.net/index.php?topic=14605.0

You can attach pictures without external hosting - but they have to be smaller than 125k each.

revjim · « **Reply #14 on:** February 01, 2008, 08:34:47 AM »

SteveD CB500F · « **Reply #15 on:** February 01, 2008, 08:52:13 AM »

Thanks Gordon. I fixed revjim's post and deleted yours.

revjim, when posting images you have to use [img] tags. You can use the icon above (thrid from left, bottom row).

Steve

754 · « **Reply #16 on:** February 01, 2008, 09:09:56 AM »

Head is 72 or earlier..

revjim · « **Reply #17 on:** February 01, 2008, 09:14:27 AM »

what upper gasket set do I need and what carb rebuild kit...

Soos · « **Reply #18 on:** February 01, 2008, 10:13:06 AM »

The carbs should have a few numbers and letters stamped on the carb bodies...
(??) right behind the mount plate that holds the carbs together.
Does each carb have a individual cable?('69/70 i beleive)
Is there an accelerator pump diaphragm on any of the carbs?(77/78)
I believe all other years are pretty much the same.(71-76)

Could be wrong some of this info.
The only 750 carb experience is with a set of 750 carbs... for my 650.

You might have different carbs than your motor(year-wise).

You were able to pull the head off in the frame?
Nice..... I've been searching for a GOOD condition amen plunger frame for a while now.

Good luck with that project!

l8r

SteveD CB500F · « **Reply #19 on:** February 01, 2008, 10:15:17 AM »

For 72 or earlier, you need a K1/K2 gasket set.

sandcastcb750 · « **Reply #20 on:** February 01, 2008, 12:01:49 PM »

By the bolt pattern on the clutch cover, its a diecast CB750. You did not show the side of the head. Looking at posts verticle to the fins, 3 spaces K0 K1 head, 2 spaces K3 and up. K0 and later clutch basket/cage different (I found that with mine) and some other details but alot of common parts.

revjim · « **Reply #21 on:** February 01, 2008, 04:21:39 PM »

I have K Model carbs...does this tell me the carb rebuild kit set I need? Thanks guys

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Author Topic: CAN'T IDENTIFY ENGINE... (Read 5174 times)

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