78 CB750 First bike build

[Sheff]

Alright everyone new to the forum and this is my first motorcycle I've ever owned. ( had dirt-bikes but not really the same thing) any way this is just kinda keeping up with the stages of work that has gone into making it what I dream of it being... One day...

so back story (short version): Most all of my buddies I hang out with have bikes and were always riding them while I was stuck in the truck blowing through gas. so I finally decided to get a bike. while searching I had a old friend tell me he wanted to get rid of his bike. asked him some questions like price and condition. he wanted $500 for the bike and it is in pretty good condition for the price i thought. bought the bike and now it is time to fix her up.

no picture of the day I bought her because it was at 11 o'clock at night. but have made some decent process.
bike originally didn't start. but new gas, spark plugs, and battery later she at least runs.

problems still to fix: right turn signal, horns won't work. I'm pretty sure I got a oil leak somewhere can't not sure where, it won't stay running unless i feather the throttle (maybe mess with the idle?) , and the rear brake seems to be quite snug against the disk, and a little bit of rust here and there. pretty sure that's everything.


anyways I'll get some pictures and stuff uploaded tomorrow. hope to get to know some of ya and thanks in advance for any advice and answering my stupid questions.

[Piute]

    Morning N Welcome,
  I'd start by flushing out those brakes,I use rubbing alcohol(about a buck 25 comes in cool squeezer (wall-mart)so you can shoot any overflow off ,I then used dot 4 they (manufacturer)attracts less water(worse part about fluid) besides eating paint.

     Carbs are best taken apart completely N cleaned best ya can plenty of write ups on that.

[shinyribs]

A super sport! Cool

Welcome to the forum.You're gonna love that bike.

[Hoko]

Glad to see another Super Sport, even the same year as mine!   K's got us outnumbered.

[Sheff]

thanks guys  i'm loving the bike so far. one thing I know that has to get done soon is the carbs. i got like 3 of them that keep pouring gas out the over flow. but the brakes have seemed to loosen up so hopefully I wont have to mess with those.

does anyone know how to hard wire a light bulb for a turn signal? cause the hardware is busted inside one of my turn signals and i don't wanna buy a new one if I can help it

[shinyribs]

If it just needs the insert you might be able to find that pigtail at a bike shop or auto parts store. I know one of the bike shops around here has a big bin of old used turn signals for $5 each. Might ask around and see if you can find something like that. If it needs the whole bulb holder,then its just time for a new light.

[Sheff]

shinyribs wrote

If it just needs the insert you might be able to find that pigtail at a bike shop or auto parts store. I know one of the bike shops around here has a big bin of old used turn signals for $5 each. Might ask around and see if you can find something like that. If it needs the whole bulb holder,then its just time for a new light.

I believe that is what I need I'm not sure exactly what it is called but its the part that holds the bulb in place and provides the power. in the mean time I think I'm going to hard wire one in just to get the right side blinkers going cause I fixed the back blinker (thank God it only needed a bulb). I'm mostly just trying to get it street-legal that way I can drive it then worry more about like the surface rust, and the more cosmetic stuff.

some good news though. I adjusted the brakes a little and it seems to roll freely now. which my buddy said the more I ride it, the snugness would loosen up? that and a little adjusting seemed to fix it so I'm gonna leave that alone for now.


Now I'm in savannah till tomorrow but when I get home I'll try to start taking some pictures and stuff of what i'm talking about so that way ya'll will have a visual instead of me trying to explain what I know nothing about ha.

[Sheff]

well guys I rebuilt the carbs and fixed one problem and have caused a new one.... Now i got something wrong I believe with the delivery of fuel. Like if i turn the choke on it will throttle beautifully. but once i turn it off and dont touch the throttle it'll die. and if I try to drive it and get over 20 it like boggs down and almost stops.anythoughts???

[TOOLS1]

You either have a vacuum leak, or your pilot jets are still plugged.
TOOLS

[Sheff]

TOOLS1 wrote

You either have a vacuum leak, or your pilot jets are still plugged.
TOOLS

any way to trouble shoot this to figure it out??

[TOOLS1]

Just spray some carb cleaner around the carbs, and boots while the bike is running, if it revs up, you have found your vacuum leak. If not, your jets are plugged.
TOOLS

[Sheff]

TOOLS1 wrote

Just spray some carb cleaner around the carbs, and boots while the bike is running, if it revs up, you have found your vacuum leak. If not, your jets are plugged.
TOOLS

I'm pretty sure its a vacuum leak cause me and my friend had an issue getting the air-box/carbs back in and attached to each other and the the engine

[TOOLS1]

The boots between the air box, and the carbs do not matter. The leak would be in the carbs themselves, or the boots between the carbs, and head.
TOOLS

[Hoko]

So the problem there would be hardened boots not sealing or not enough pressure from the clamps?

[Sheff]

we put brand new boots on there and they seemed to fit quite nicely. but should I spray the carb end or the end closer to the headers?

[TOOLS1]

Unless you want to go as Freddie Kruger, for Halloween DON'T go spraying cab cleaner on the headers!!!
TOOLS

[Sheff]

TOOLS1 wrote

Unless you want to go as Freddie Kruger, for Halloween DON'T go spraying cab cleaner on the headers!!!
TOOLS

i am confused as to where to spray it then

[Piute]

       L.O.L.
   I'm sorry bud .......the headers are your pipes (were they come "OUT" the heads(front of bike) Real HOT,Even with new or good boots they still have to be turned just right,Mine have a factory mark on them But also made some better for myself.
 
             I don't see any pictures yet

  you wont to spray on the boots one side goes to carb.
                                 The other to the intake on your heads  

[Sheff]

Piute wrote

L.O.L.
   I'm sorry bud .......the headers are your pipes (were they come "OUT" the heads(front of bike) Real HOT,Even with new or good boots they still have to be turned just right,Mine have a factory mark on them But also made some better for myself.
 
             I don't see any pictures yet

  you wont to spray on the boots one side goes to carb.
                                 The other to the intake on your heads  

would i really need to mess with the pipes?? I never removed or touched them?
plus I still got one carb leaking fuel (just noticed it this morning ) other than that she def seemed more perky this morning and drove quite nicely. this bike can't decide what it wants to have wrong with it.

[Hoko]

Paint still looks good, thats a good looking bike.  Vacuum leak will only be between your carburetor and the cylinder on the intake side, you dont have to mess with your exhaust headers at all.  If you have a carburetor leak, you are going to have to pull your carburetor assembly off the bike and set the float level.  Look under Repair Sources on the forum main page for the Carburetor cleaning tutorial.  It will show you how to set your float levels.  I would check all your float levels while you have it off. Check all your float needles and jets, inspect and clean each needle seat (jet).  A poor sealing float jet will overflow the bowl just like incorrect float levels.  Each one should be smooth and clean.  You can clean them with a Qtip and chrome polish. I would also visually check all your jets, Pilot Screw jets, Slow Jets, and Main Jets and by blowing carb cleaner with a spray can of carb cleaner with the small tube or compressed air through them to see if any of them are clogged.  I used a metal high E guitar string to ream mine out, I also soaked them for 2 weeks in chem dip because the PO left the bike sitting on his driveway for 5 years so all the jets were choked with varnish but if yours doesnt have varnish thats not necessary.  Be careful not to lose the tiny o-ring on the #2 carb.  Also when you pull your Pilot Screws out be careful not to lose the tiny flat washer on the end of each one.  I lost 3 of them before I knew they were there.  Couldnt find a washer that small anywhere and had to order 3 entire screw,spring and washer assemblys at $13 bucks each. There is also a tiny o-ring on the end of each pilot screw that usually stays in the bottom of the hole which you will have to pull out with an o-ring pick.  Replace the o-rings if they look bad.  Auto part stores have them.