Topic: New member from Chicago 76 CB 750 super sport

[vintagehonda750]

Greetings just bought a 76 750F plan on going the cafe route but
First want to make sure everything is running smooth.
Check out the pics and let me know what you guys think.

[tool14]

welcome aboard

[70CB750]

Welcome!  Looks very clean, how many miles?

[vintagehonda750]

Welcome!  Looks very clean, how many miles?

Thanks. It has 16k and it's pretty much stck and clean all around,
Except for the tires heck it even came with the original tool kit.
Any pointers on what maintenance to do at this point?

[70CB750]

There is something called 3000 miles maintenance and thats where I would start.

You can download shop manual right here:

http://forums.sohc4.net/index.php?topic=17788.0

After 3000 address issues - if any - one by one.

Good luck.

[vintagehonda750]

There is something called 3000 miles maintenance and thats where I would start.

You can download shop manual right here:

http://forums.sohc4.net/index.php?topic=17788.0

After 3000 address issues - if any - one by one.

Good luck.

Thanks for link I will look up the 3k maintenance
And hope to hear from you in the near future thanks
For the input. 

[edwardmorris]

Welcome from NW Indiana. Nice looking bike. What part of Chicago land are you located?

[Jerry Rxman Griffin aka MuthaF'er]

Way too nice to hack up into a café. Save that one and find another rough bike to café. Save the original take off parts for us forum members if you do cut it up.

[goldarrow]

Way too nice to hack up into a café. Save that one and find another rough bike to café. Save the original take off parts for us forum members if you do cut it up.

x2

[vintagehonda750]

Way too nice to hack up into a café. Save that one and find another rough bike to café. Save the original take off parts for us forum members if you do cut it up.

x2

You guys really got me thinking now. Might just change the bars and save my pennies for another.

[Jerry Rxman Griffin aka MuthaF'er]

Are any of your other pipes discolored? #4 looks like it's running or has run lean in the past and creating quite a bit of heat to discolor the double wall pipe. Not common.

[vintagehonda750]

Are any of your other pipes discolored? #4 looks like it's running or has run lean in the past and creating quite a bit of heat to discolor the double wall pipe. Not common.

The other pipes seem to be the same. To be honest I just got the bike
And not sure if it's running lean but when I start it when cold it is very difficult to start
I basically need to hold throttle ~1/4 for a few minutes or it will shut off, why not pull choke
You might ask- if I pull the choke out it dies out instantly.

[Jerry Rxman Griffin aka MuthaF'er]

I say it's time for a jet check. Don't know your mechanical ability. Have you had carbs apart before? Do you know how to get the bowls off? Slow jets and mains are easy to check their sizes. Stock size mains should be 105 and the slow jets should be 40. Needles (mid-range) require the carbs to be removed and taken apart. The needle clips should be in the middle position. Save that for last if necessary. Do one of the outside carbs as an indicator of the others. Need to also check the cleanliness condition of the carb innards with the bowl off.

Glad to provide advice if needed. These beasts are cold blooded to a certain degree.

The advice on the 3000 mile tune up stuff is a great idea. Can't hurt, only help if needed. Perhaps do that first as suggested plus check the jetting before tearing into carbs other than possibly changing the jets if not stock configuration. 

[Jerry Rxman Griffin aka MuthaF'er]

Way too nice to hack up into a café. Save that one and find another rough bike to café. Save the original take off parts for us forum members if you do cut it up.

My rationale is based on the restoration of my original owner bike and putting a second one together using all my original old take off parts and with alterations like you are thinking of.   

[vintagehonda750]

Not an expert on carbs by any means although I do like learning new things and I def.
knew what I was getting myself into when buying a 38yr old bike. Cleaning carbs was already on my list so might as well double check the jets.
The guy I bought it from stated that it was running rich so maybe the jets might be the problem.
I also just bought the clymer manual and will start with tune up as time permits.
On a diff. Note I noticed that my brake light doesn't turn on w/front brake only with rear
I checked the fuse box and it seems like only the 2 and 3rd ports going down are live and the wires from the front box one colored green mixed with blue doesn't seem to have any power
Any advice on which route to take with locating the issue??? (Oh and sorry for the damn long post)

[edwardmorris]

Not an expert on carbs by any means although I do like learning new things and I def.
knew what I was getting myself into when buying a 38yr old bike. Cleaning carbs was already on my list so might as well double check the jets.
The guy I bought it from stated that it was running rich so maybe the jets might be the problem.
I also just bought the clymer manual and will start with tune up as time permits.
On a diff. Note I noticed that my brake light doesn't turn on w/front brake only with rear
I checked the fuse box and it seems like only the 2 and 3rd ports going down are live and the wires from the front box one colored green mixed with blue doesn't seem to have any power
Any advice on which route to take with locating the issue??? (Oh and sorry for the damn long post)

SOHC Digger is a member here who's in Chicago and offers a great carb rebuild service, might want to consider that as you'll save a lot not having to ship and his work is great from what I read here.

I'm not too familiar with the later year bikes but for the brake light with the front break, check to see if the pressure switch is connected to the harness properly. Also, this is just an introductory forum, not the largest audience. I suggest you start a new thread in the SOHC/4 Bikes forum and you'll get a lot more and experienced answers.

[Jerry Rxman Griffin aka MuthaF'er]

Our 5 position fuse box contains 3 hot fuses and 2 spares. 1 - 15A main and a 7A headlight and a 7A taillight. You've already determined the brake light works. Check your front brake switch for continuity. It is on the back left side of the forks near lower triple tree. G/W and black wires. Looks like the oil pressure switch which is located by the starter motor cover. See if you have continuity in the switch when you squeeze the brake lever. Put an jumper between the 2 wires and see if the brake light comes on. That way you should be able to isolate where the problem is ie on which side of the switch. 

Couldn't locate a G/B wire on my schematic?? Oh, there is a 'secret' jumper wire in the front box too that I have never found on any of the schematics. Should you find 2 wires of different colors connected/disconnected that have different connectors that do not fit together then this is where the 'secret' jumper goes.

[vintagehonda750]

Welcome from NW Indiana. Nice looking bike. What part of Chicago land are you located?

Thanks for the info Edward I will definitely get in contact with him and check that out soon.
I'm close to Chicago in Cicero not sure if you're familiar with the area.

[vintagehonda750]

Our 5 position fuse box contains 3 hot fuses and 2 spares. 1 - 15A main and a 7A headlight and a 7A taillight. You've already determined the brake light works. Check your front brake switch for continuity. It is on the back left side of the forks near lower triple tree. G/W and black wires. Looks like the oil pressure switch which is located by the starter motor cover. See if you have continuity in the switch when you squeeze the brake lever. Put an jumper between the 2 wires and see if the brake light comes on. That way you should be able to isolate where the problem is ie on which side of the switch. 

Couldn't locate a G/B wire on my schematic?? Oh, there is a 'secret' jumper wire in the front box too that I have never found on any of the schematics. Should you find 2 wires of different colors connected/disconnected that have different connectors that do not fit together then this is where the 'secret' jumper goes.

Thanks for the info seems like what you guys stated might be the problem
I'll check that out and keep you guys posted. Thanks for all the input