Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50 (Read 247799 times)

edwardmorris · « **Reply #1250 on:** July 21, 2015, 07:32:10 PM »

LOL I went as far as they let me on wheels, I refused to leave it unatended

edwardmorris · « **Reply #1251 on:** July 22, 2015, 09:40:10 PM »

Time to let go, this is what 17K looks like in Honda wrapper form

. Need to return all borrowed space, so this 3x2x1 foot box is heading to the recyclers

.

SOHC4 Cafe Racer Fan · « **Reply #1252 on:** July 22, 2015, 11:37:30 PM »

Damn!!

Stev-o · « **Reply #1253 on:** July 23, 2015, 01:49:20 AM »

JT Marks is going to miss you.

evanphi · « **Reply #1254 on:** July 23, 2015, 05:39:30 AM »

I hope you kept track of all those parts numbers (of course you did)!

edwardmorris · « **Reply #1255 on:** July 23, 2015, 08:53:10 AM »

Quote from: Stev-o on July 23, 2015, 01:49:20 AM

JT Marks is going to miss you.

K3 is only a couple years out

Its custom but still needs a lot of OE stuff replaced.

edwardmorris · « **Reply #1256 on:** July 29, 2015, 07:19:55 PM »

Took it out for a spin today and ended up stranded on the road

No idea what happened, was happily in 5th and all of a sudden it turned off on me. I pulled over, looked for obvious things. Fuse is intact, carbs are getting fuel, all connections from the points out are intact, all connections to the coils are intact, all spark boots are in place. When I hit the start button it cranks/turns over but doesn't start. Ended up towing it home on a flat bed. Ideas?

70CB750 · « **Reply #1257 on:** July 30, 2015, 05:03:24 AM »

Quote from: calj737 on July 29, 2015, 08:03:15 PM

Check the KILL switch wiring. The BLK/WHT wire to the coils must have 12v at the coil when the switch is ON

That!

edwardmorris · « **Reply #1258 on:** July 30, 2015, 09:02:56 AM »

Thanks, I'll check that for sure.

Another possibility from some searching, jets drowning?? I have a feeling my #2 carb float is stuck wide open again as it was overflowing hard when I turn the petcock after I had the bike towed home. The other 3 seem fine, so how likely is it that one flooding carb to make it not start at all?

70CB750 · « **Reply #1259 on:** July 30, 2015, 09:11:06 AM »

Very unlikely. You can limp home on 2 cylinders, or it may not run right or to full power or you would just feel it is not the same, but it would still run.

Sudden stop is most likely electrical, that is just the nature of the beast

edwardmorris · « **Reply #1260 on:** July 30, 2015, 09:20:23 AM »

Quote from: 70CB750 on July 30, 2015, 09:11:06 AM

Very unlikely. You can limp home on 2 cylinders, or it may not run right or to full power or you would just feel it is not the same, but it would still run.

Sudden stop is most likely electrical, that is just the nature of the beast

Thanks Prokop, somehow that's a relief as I found it easier to work on the electrics than the carbs. #2 just doesn't want to co-operate, its the one carb that's been giving me some siht. Once this issue is sorted, I'll pull the carbs and redo float heights as well. I'm tempted to go with the non brass floats as well as they don't seem so bulky and may not hit the walls as much, but it could just be wishful thinking.

70CB750 · « **Reply #1261 on:** July 30, 2015, 09:27:49 AM »

You did not run out of gas, did you?

edwardmorris · « **Reply #1262 on:** July 30, 2015, 09:42:12 AM »

Nope, tanks has tons of gas, hasn't even hit reserve. The one time it went into reserve, the shut off wasn't so instant. That was a scary the first time

Duanob · « **Reply #1263 on:** July 30, 2015, 10:08:49 AM »

Quote from: edwardmorris on July 30, 2015, 09:42:12 AM

Nope, tanks has tons of gas, hasn't even hit reserve. The one time it went into reserve, the shut off wasn't so instant. That was a scary the first time

First time i've caught this thread. I browsed the first three pages then skipped ahead to here. What a beautiful job Ed! Something to be proud of. You and Sohron could teach a class on restoration of these old classic bikes.

Did the choke magically turn itself to the closed position? I had that happen once. I blamed it on gremlins but I think it was my pant leg flapping in the 70MPH breeze. I'm not a 750 guy so I don't know where the choke is on your bike. Just throwing suggestions out there. Good luck.

edwardmorris · « **Reply #1264 on:** July 30, 2015, 10:51:49 AM »

Thanks Duane! I know its a long read, so you can check out a summary below in the BOTM thread. From the first three pages, you can tell how clueless I was at the beginning. Its only because of the help from this awesome forum that I managed to get to where the bike is on page 50

http://forums.sohc4.net/index.php/topic,149745.msg1708584.html#msg1708584

The choke on the 750s is on the left side, and clears my knees well so its probably ok. Like Prokop said, sudden stop might just be a fried electric somewhere, just need to track it down.

evanphi · « **Reply #1265 on:** July 30, 2015, 11:12:00 AM »

I had a sudden loss of electrics and it behaved the same way. You can even start by wiggling some wires. That's how I figured out which branch of the wiring harness my problem was. Thankfully it just stopped once! Mine was intermittent and would stop and then restart in slow traffic. Almost made for an accident (or four)...

As everyone has said, it is probably something to do with switched power, AKA kill switch.

edwardmorris · « **Reply #1266 on:** August 02, 2015, 01:27:20 PM »

OK, just went out to see what's up and it fired right up, all four with excellent idle

The kill switch is connected through the headlight bucket, so I'm thinking I should look at the nest again and see if something got knocked loose $:-\$ All the wires throughout the controls are pretty much new with refreshed terminals, but you never know.

Restoration Fan · « **Reply #1267 on:** August 02, 2015, 04:07:00 PM »

Quote from: calj737 on August 02, 2015, 03:19:55 PM

Carefully inspect the BLK/WHTat the coils. Ron and Logan had this very issue where the wire was pinched and until he traced the wire back, he overlooked it. Helps to lift the tank out of the way too.

*sniff* I did NOT overlook it.

It was merely, ummmm, hidden behind the coils and the little connecting band.
But, yeah, your point is valid. Ours was pinched. Once we found that, it fixed our wiring problem.

Stev-o · « **Reply #1268 on:** August 02, 2015, 07:24:29 PM »

Congrats to Mo on the BOTM win!

edwardmorris · « **Reply #1269 on:** August 03, 2015, 09:15:31 AM »

Thanks Stev-O and all who voted!

Had a nice local ride yesterday totally glitch free. Traced as much of the visible wiring as closely as I could and didn't see anything off. Tonight after work, I will lift the tank off and undo the headlight dome to make sure all connectors back there are still intact. The control wiring goes through the handlebars and I'm really hoping to not have to pull that out ever!

edwardmorris · « **Reply #1270 on:** August 09, 2015, 05:04:01 PM »

Today I switched out my break in Rotella Oil with the 20w50 Spectro and what a difference! The 15w40 Rotella wasn't bad in the cooler end of June/most of July, but as it started warming up it wasn't feeling quite that good. The Spectro on the other hand has an amazing feel on the clutch, shifts even smoother and more definitively??(if that's a way to describe it).

Best of all, I found it locally at a bike shop. The owner assured me this was the best oil he had in the store for these old bikes. He asked me what bike I had and I told him. We were chatting about the bike, he rang me up and said if you sign up for preferred membership it'll be cheaper. By this time, I had pulled up the pix on my phone and I showed it to him. The shock and amazement was priceless

He immediately dropped what he was doing, yelled out to his wife in the back of the shop and waved me to "come on back". While the wife was scrolling through pix in amazement, he showed me his 75(or76) Super Sport he was restoring. Tank was painted and ready to go on, bike was mostly intact and he hadn't pulled the engine. He did not believe me when I told him my covers were polished. I had to show him some before/during/after shots to convince him

He gave me good discount. I reminded him I needed to sign up for the preferred thingy and he said to me "I'll never forget you or that beauty of yours, just make sure you only come here for your bike's needs and we'll take care of you".

Not a bad day

edwardmorris · « **Reply #1271 on:** September 05, 2015, 04:10:56 PM »

Fun day chillin with Sean today, got the carbs synced nearly perfect finally, bike rides and idles better than ever!

Restoration Fan · « **Reply #1272 on:** September 05, 2015, 04:20:07 PM »

Somehow I missed your update back on August 9th, Rafi. That's an awesome story and how cool is it that you have a motorcycle store where you have an SOHC connection!

Is that Sean's Interceptor? My oldest son keeps saying that's the kind of bike he wants. He'll be very jealous when I show him this photo.

Medyo Bastos · « **Reply #1273 on:** September 05, 2015, 05:36:35 PM »

morgans carbtune is the way to gooooo!

mrbreeze · « **Reply #1274 on:** September 05, 2015, 11:10:43 PM »

Love seeing the carbtune there. My preferred method also but PLEASE,PLEASE! be careful drawing your gas like that. You will not be a happy camper if that tank accidently gets pulled off and dented. It's too Purdy for that to happen.

News:

Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50 (Read 247799 times)