Author Topic: 1977 CB750 K7 Resto-mod, Knoxville (Read 99325 times)

Desert-SOHC · « **Reply #450 on:** July 27, 2015, 06:36:49 PM »

Frikin AWESOME!!!!!!!!

70CB750 · « **Reply #451 on:** July 28, 2015, 03:11:43 AM »

Quote from: AintNoEasyWay on July 27, 2015, 05:52:46 PM

Switched the master link clip around once I got the right size pliers. Dealt with a bunch of other odds & ends tonight making sure everything is good to go before I put on the oil tank, air box, & exhaust. My dad has been out of town but I'd like him to be around for the start up. I think he'll be able to come by Wednesday night, so we'll try to crank it then.

Does not hurt to tie a thin wire around the clip either. Never mind how I know

Like this:

AintNoEasyWay · « **Reply #452 on:** July 28, 2015, 05:20:30 AM »

Quote from: 70CB750 on July 28, 2015, 03:11:43 AM

Quote from: AintNoEasyWay on July 27, 2015, 05:52:46 PM
Switched the master link clip around once I got the right size pliers. Dealt with a bunch of other odds & ends tonight making sure everything is good to go before I put on the oil tank, air box, & exhaust. My dad has been out of town but I'd like him to be around for the start up. I think he'll be able to come by Wednesday night, so we'll try to crank it then.

Does not hurt to tie a thin wire around the clip either. Never mind how I know

70, very very good idea. When putting the clip on I was wondering how secure this thing was...

AintNoEasyWay · « **Reply #453 on:** July 28, 2015, 06:00:27 AM »

Can anyone tell me where the negative battery cable attaches? I can't remember & can't seem to find it in the manual.

Desert-SOHC · « **Reply #454 on:** July 28, 2015, 09:51:07 AM »

^^^^yup

AintNoEasyWay · « **Reply #455 on:** July 28, 2015, 09:56:18 AM »

Quote from: calj737 on July 28, 2015, 06:01:48 AM

Left side of frame above the swing arm pivot bolt.

Fits in that upper back engine bolt right?

Desert-SOHC · « **Reply #456 on:** July 28, 2015, 10:10:51 AM »

That's where mine is

AintNoEasyWay · « **Reply #457 on:** July 28, 2015, 10:12:52 AM »

Quote from: Desert-SOHC on July 28, 2015, 10:10:51 AM

That's where mine is

Sweet, thanks Desert.

AintNoEasyWay · « **Reply #458 on:** July 28, 2015, 07:09:14 PM »

I think this rubber hose from the oil tank connects to the back of the crankcase, correct? Just want to be sure.

Also couldn't resist throwing the tank & seat on... I've got blank side cover emblems that I need to paint & throw on. Also need to remove & touch up those tank badges...

enwri · « **Reply #459 on:** July 29, 2015, 03:38:37 AM »

That's looking good,, Does anyone wear engine crash bars now? I like the look, a bit of chrome under the front of the black cases, also handy when someone bumps it over in the carpark.
It should feel and go like a new one now, it's got to go at least 25% better with the main jet back in, to just to start with.

AintNoEasyWay · « **Reply #460 on:** July 29, 2015, 05:37:49 AM »

Quote from: enwri on July 29, 2015, 03:38:37 AM

That's looking good,, Does anyone wear engine crash bars now? I like the look, a bit of chrome under the front of the black cases, also handy when someone bumps it over in the carpark.
It should feel and go like a new one now, it's got to go at least 25% better with the main jet back in, to just to start with.

Rarely see engine bars nowadays. I actually wouldn't mind having them on my bike.

Having the main jet in is sure to help! Could one main jet falling out account for the white film on my other three exhaust valves? Would really like to know if I was running the bike too lean or if the problem can be traced to the main jet coming out.

enwri · « **Reply #461 on:** July 29, 2015, 06:01:25 AM »

I would have thought the jet missing would have a lot to do with the one dark valve, do you remember which carb it was? hope it was that one.
The plugs being the right colour will tell you more than the valve colour will, (plug will look burnt before the valves burn, If it's extra lean. They only normally burn if there is a slight bend or imperfection in the seat or valve anyway, I think they worked out how to stop them melting in the late 50's, better metallurgy?)
But you will be checking the plugs once it runs, colour charts on here somewhere.
The exhaust valves always run hotter than the intakes. They used to have a nice white/gray coat of lead dust on them with the old leaded fuel..

AintNoEasyWay · « **Reply #462 on:** July 29, 2015, 06:11:54 AM »

Quote from: enwri on July 29, 2015, 06:01:25 AM

I would have thought the jet missing would have a lot to do with the one dark valve, do you remember which carb it was? hope it was that one.
The plugs being the right colour will tell you more than the valve colour will, (plug will look burnt before the valves burn, If it's extra lean.)
But you will be checking the plugs once it runs, colour charts on here somewhere.
The exhaust valves always run hotter than the intakes. They used to have a nice white/gray coat of lead dust on them with the old leaded fuel..

Interesting. Yes, I'll definitely be checking the plugs once it's running. The one dark valve was #3, which is the same carb the main jet came out of. I just looked at the photos to confirm.

enwri · « **Reply #463 on:** July 29, 2015, 06:31:24 AM »

I just went and checked your plug photo, 1,2,4, normal 3 wet.

Desert-SOHC · « **Reply #464 on:** July 29, 2015, 10:49:52 AM »

Quote from: enwri on July 29, 2015, 03:38:37 AM

Does anyone wear engine crash bars now? I like the look, a bit of chrome under the front of the black cases, also handy when someone bumps it over in the carpark.

I have them on mine, they were on it when I got it. They are painted black and I haven't removed the paint to see what shape the chrome is in or how scratched they are......lol

AintNoEasyWay · « **Reply #465 on:** July 29, 2015, 06:54:31 PM »

Ok, got everything on & set to go except for the air box. Completely forgot how I managed to get it on when I first rebuilt the carbs. It's getting late now & im not making progress getting it on. I'll leave it be for the night & maybe it'll be a quick fix tomorrow after work.

I should add that I split the air box in two & got the top piece in behind the carbs. It's the boots I'm having trouble getting attached to the carbs.

AintNoEasyWay · « **Reply #466 on:** July 30, 2015, 03:45:22 PM »

Got the air box on & tried the first start...

No luck. I've got all the ignition wires hooked up correctly. Compression is there because I kicked it over 40-50 times like Hondaman recommends to make sure I've got oil working down into the engine. Oh, & yes, the petcock is on, fuel flowing.

Not sure where else to look. I didn't take the carbs completely apart again when I had them off, but I can't imagine there's a problem there. I barely ran them last year. I could at least take the air box off & make sure the accelerator pump is working.

Now the guess work begins...

AintNoEasyWay · « **Reply #467 on:** July 30, 2015, 04:43:02 PM »

Update: just came back to the garage & tried draining my float bowls. Only #1 had gas in it & barely any at that. Took off the tank & turned the peacock on realizing it's barely draining. May need a petcock fix here.

oldhatt45 · « **Reply #468 on:** July 30, 2015, 05:00:56 PM »

AintNoEasyWay,

That would explain a couple of things.
Great Gas Mileage (sorry couldn't resist. <G>) and failure to run.
Glad it's something relatively easy to fix!

Charlie

AintNoEasyWay · « **Reply #469 on:** July 30, 2015, 05:06:53 PM »

Quote from: oldhatt45 on July 30, 2015, 05:00:56 PM

AintNoEasyWay,

That would explain a couple of things.
Great Gas Mileage (sorry couldn't resist. <G>) and failure to run.
Glad it's something relatively easy to fix!

Charlie

Gas mileage has been excellent ever since I started rebuilding the engine. Amazing!

I'm able to shoot wd40 straight through the petcock with no problems though. So not sure what the issue is with it.

enwri · « **Reply #470 on:** July 30, 2015, 05:12:50 PM »

inline fuel filter and an air bubble stopping flow?
Tried the reserve setting?

AintNoEasyWay · « **Reply #471 on:** July 30, 2015, 05:18:44 PM »

Quote from: enwri on July 30, 2015, 05:12:50 PM

inline fuel filter and an air bubble stopping flow?
Tried the reserve setting?

Yep, the inline filter definitely had a bubble! But even when I took the tank off & tried to drain from just the petcock, barely had flow.

Restoration Fan · « **Reply #472 on:** July 30, 2015, 05:20:20 PM »

Nate,
Do you have an auxiliary tank you can use? When you're trying to start the bike and diagnose problems, it's nice to be able to eliminate the fuel flow from the fuel tank as an issue.

Ron

enwri · « **Reply #473 on:** July 30, 2015, 05:22:44 PM »

+1 on the tank.
there's a tube screen in the tank that wont always come out with the tap, can be a restrictor if it's dirty.
can also trap air for a while if the tank has been dry

AintNoEasyWay · « **Reply #474 on:** July 30, 2015, 05:28:31 PM »

Quote from: enwri on July 30, 2015, 05:22:44 PM

+1 on the tank.
there's a tube screen in the tank that wont always come out with the tap, can be a restrictor if it's dirty.
can also trap air for a while if the tank has been dry

I changed that screen when I derusted/cleaned the tank. Glanced at it with a flashlight & it's still clean.

Enwri, I switched to reserve & gas flows fine. Maybe I just need to fill the tank up more??

. I didn't put much in it at first. Will try to start it just from reserve maybe? Or should I go ahead & fill tank most of the way?

News:

Author Topic: 1977 CB750 K7 Resto-mod, Knoxville (Read 99325 times)