Author Topic: Here's my 73 750 (Read 2256 times)

Mbanda · « **on:** April 16, 2023, 05:30:21 AM »

So this is my new to me 73 cb 750 and I have an engine on the way! As of currently I'm waiting for a brake rod setup and a new chain. I'm excited I've always wanted to own one and now I do!

MauiK3 · « **Reply #1 on:** April 16, 2023, 08:33:17 AM »

Welcome
What direction are you going? Stock?

Alan F. · « **Reply #2 on:** April 16, 2023, 10:49:19 AM »

Looks to be hard-tailed, interested in hearing your plans.

Mbanda · « **Reply #3 on:** April 16, 2023, 12:07:50 PM »

Yes as of now I'm going to keep the engine stock. Yes it's a hard tail. I'm not sure if it's home brewed or a kit that someone put on. But I dig it 😀 only thing I've been struggling with really so far is the tank. I have one but from internet searching it seems to be a sportster tank that has some poor welds on it.

Mbanda · « **Reply #4 on:** April 16, 2023, 12:16:28 PM »

Here's more photos

70CB750 · « **Reply #5 on:** April 21, 2023, 09:00:14 AM »

Nice start! Following.

Stev-o · « **Reply #6 on:** April 21, 2023, 10:01:26 AM »

Congrats on getting a 750 and welcome to the SOHC forum

Is the engine ready or will need rebuild?

Mbanda · « **Reply #7 on:** April 21, 2023, 09:17:33 PM »

Well I got my engine in fellas! Boy I never wanna do that again lol 😆 can anyone help me out I belive I have switched up the leads going to my spark plugs. If anyone can tell me what lead to which plug that'd be awesome

Mbanda · « **Reply #8 on:** April 21, 2023, 09:19:49 PM »

The original engine that was in it was blown up unfortunately. I'm pretty sure it's the engine that came with it as well. I'm going to rebuild it at a later date that way I have another back up engine.

Alan F. · « **Reply #9 on:** April 21, 2023, 10:08:23 PM »

Sounds like good plan. Nice job getting the engine back in. There are Shop Manuals to download around here somewhere.

newday777 · « **Reply #10 on:** April 22, 2023, 03:43:44 AM »

Quote from: Mbanda on April 21, 2023, 09:17:33 PM

Well I got my engine in fellas! Boy I never wanna do that again lol 😆 can anyone help me out I belive I have switched up the leads going to my spark plugs. If anyone can tell me what lead to which plug that'd be awesome

Left coil is 1/4, the 1/4 coil has a blue wire plugged into it, the 2/3 coil a yellow wire.

Mbanda · « **Reply #11 on:** April 22, 2023, 08:35:05 PM »

Okay awesome ! I belive the person who had this engine listed it wrong . I belive its a 76 engine but the Supersport model. It had studs for the exhaust that I converted over to the 73k exhaust flange and the points wires are blue and white l. Can anyone confirm?

Mbanda · « **Reply #12 on:** April 22, 2023, 08:50:23 PM »

Also so here is some pics I took right now of the exhaust and of the points wires on the outs9de of the cover and not the inside. I haven't looked yet the wife wants to spend some time together ...yuck lolol. I'll post on the points tomorrow and see if it's yellow underneath the cover

Mbanda · « **Reply #13 on:** April 23, 2023, 05:21:57 PM »

Points wires

newday777 · « **Reply #14 on:** April 23, 2023, 07:49:35 PM »

Quote from: Mbanda on April 23, 2023, 05:21:57 PM

Points wires

The insulation looks bad

Stev-o · « **Reply #15 on:** April 24, 2023, 07:08:32 AM »

Quote from: Mbanda on April 22, 2023, 08:35:05 PM

Okay awesome ! I belive the person who had this engine listed it wrong . I belive its a 76 engine but the Supersport model. It had studs for the exhaust that I converted over to the 73k exhaust flange and the points wires are blue and white l. Can anyone confirm?

Look up the engine VIN on the chart here to determine what year it is...

http://www.sohc4.com/cb750/cb750k/#serial-numbers

MauiK3 · « **Reply #16 on:** April 24, 2023, 08:08:07 AM »

I will bore folks here
Get Hondaman's book, saves lots of time and effort.

https://www.amazon.com/CB750-book-Putting-Them-Back/dp/B003NTKQTA/ref=sr_1_4?crid=2AN8OO1WTJ8YF&keywords=mark+paris+honda+book&qid=1682348853&sprefix=mark+paris+honda+book%2Caps%2C210&sr=8-4&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840

Stev-o · « **Reply #17 on:** April 24, 2023, 08:19:49 AM »

Quote from: MauiK3 on April 24, 2023, 08:08:07 AM

I will bore folks here
Get Hondaman's book, saves lots of time and effort.

https://www.amazon.com/CB750-book-Putting-Them-Back/dp/B003NTKQTA/ref=sr_1_4?crid=2AN8OO1WTJ8YF&keywords=mark+paris+honda+book&qid=1682348853&sprefix=mark+paris+honda+book%2Caps%2C210&sr=8-4&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840

Yes, but much cheaper here...

https://www.lulu.com/shop/mark-paris/my-cb750-book-hardcover-edition/hardcover/product-22322967.html?page=1&pageSize=4

Mbanda · « **Reply #18 on:** April 24, 2023, 06:55:52 PM »

Hey ! Any and all help is awesome! I don't know everything about these bikes but I do know some. This isn't my first time tearing one apart engine wise..but it is for wiring and such..but hey I got spark fellas wired up the points and hooked up the battery real quick 😎

Mbanda · « **Reply #19 on:** April 24, 2023, 06:57:40 PM »

Another shot of it

RAFster122s · « **Reply #20 on:** April 25, 2023, 02:45:56 AM »

10% off lulu coupon code good through Friday the 28th is:
INBLOOM10

Mbanda · « **Reply #21 on:** April 28, 2023, 08:08:40 PM »

Got the carbs on and exhaust on

richmagee7 · « **Reply #22 on:** May 04, 2023, 03:37:39 PM »

Following.

Mbanda · « **Reply #23 on:** July 30, 2023, 08:07:58 PM »

Got another question. The oil tank that is pictured has a breather line at the top were the fill cap is located and it also has a long breather line that is on the left side of the tank and that originally plugged into the engine breather port on the lower back portion of the engine. My question is do I need to re attach this breather line or can I leave it left off ?

scottly · « **Reply #24 on:** July 30, 2023, 08:30:08 PM »

Your aftermarket oil tank appears to have the same separate vent line and connection to the spigot like an early stock tank. If the tank is indeed the same as stock on the inside, oil will occasionally drain out of that hose, so it should be connected to the spigot on the back of the engine so it can be returned to the crankcase instead of dumping on the ground.

HondaMan · « **Reply #25 on:** August 15, 2023, 08:22:52 PM »

Hey! I have that same lawn mower!

Mbanda · « **Reply #26 on:** August 20, 2023, 06:32:08 PM »

So my one of my carbs on my rack is shot.. idk what to call it but where the emulsion tube sits inside of and where the main jet screws into is cracked 3/4 around ...I'm thinking of getting the speedmoto co two carb setup as it it actually fitting into a stock frame. Any thoughts ?

Gurp · « **Reply #27 on:** August 20, 2023, 09:22:27 PM »

Cycle X (Cycle exchange) had a 2 carb setup that fits in a stock frame that's been hardtailed. I have that setup on my 75 CB 750.
I can get some pics but it will be later in the week as the bike is at my buddy's hut where we keep the overflow from out bikes. Pretty sure there is at least a pic of it on my "poor boy chop" thread though.

Mbanda · « **Reply #28 on:** August 21, 2023, 06:16:37 AM »

It's a great mower! Lol it's had a hard life and it still keeps going strong lol

Mbanda · « **Reply #29 on:** August 21, 2023, 06:18:43 AM »

I saw that as well , it seems that I will keep that solution on the back burner , I have found a #3 right inner carb for the oe carbs ima buy that and rebuild them all and see what happens

HondaMan · « **Reply #30 on:** August 21, 2023, 08:41:44 PM »

Quote from: Mbanda on August 21, 2023, 06:16:37 AM

It's a great mower! Lol it's had a hard life and it still keeps going strong lol

I finally had opportunity to learn about Honda's lawn mower carb last year. I can't remember when I even bought this thing, but it's been like my 750: always there, always ready - until the paper intake gasket finally disintegrated last year and made it hard to throttle correctly (vacuum leak). It must be at LEAST 10 years old. Got new carb gaskets and it fixed it right back up.

Mbanda · « **Reply #31 on:** March 18, 2024, 08:16:32 AM »

nice , mines got some problems as well , but I've been so emassed in trying to get my 750 up and going I've neglected other things...but besides that I've found out the reg/rect is destroyed and so I purchased another one. only thi g now is carb innards and a license plate bracket

Mbanda · « **Reply #32 on:** March 18, 2024, 08:18:41 AM »

made a custom key and electronics holder

willbird · « **Reply #33 on:** March 18, 2024, 08:57:50 AM »

Quote from: Mbanda on August 20, 2023, 06:32:08 PM

So my one of my carbs on my rack is shot.. idk what to call it but where the emulsion tube sits inside of and where the main jet screws into is cracked 3/4 around ...I'm thinking of getting the speedmoto co two carb setup as it it actually fitting into a stock frame. Any thoughts ?

Every video I have seen of the two carb setups the dude is bragging about how GREAT it runs, while we can plainly see and hear that it runs like dog poo LOL.

Bill

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Author Topic: Here's my 73 750 (Read 2256 times)