Topic: New Project! 1970 CB750K1!

[newday777]

I have a decent connector to put on it. Getting ready to go get a bite to eat and the swap out the connector.

[newday777]

Replaced the 6 pin connector

[newday777]

So Brandon, you are going to use your regulator and just need my rectifier sent?

[God of Thunder]

So Brandon, you are going to use your regulator and just need my rectifier sent?

I think that’s the plan - unless you want to sell the both together! Just shoot me an email with the cost!

[newday777]

So Brandon, you are going to use your regulator and just need my rectifier sent?

I think that’s the plan - unless you want to sell the both together! Just shoot me an email with the cost!

I can sell both if you want both. I haven't tested them.

[God of Thunder]

So Brandon, you are going to use your regulator and just need my rectifier sent?

I think that’s the plan - unless you want to sell the both together! Just shoot me an email with the cost!

I can sell both if you want both. I haven't tested them.

I think I only “need” the rectifier - as my regulator looks fairly nice. But if you don’t want to be stuck with it, I can always buy it just because!

[newday777]

So Brandon, you are going to use your regulator and just need my rectifier sent?

I think that’s the plan - unless you want to sell the both together! Just shoot me an email with the cost!

I can sell both if you want both. I haven't tested them.

I think I only “need” the rectifier - as my regulator looks fairly nice. But if you don’t want to be stuck with it, I can always buy it just because!

Either way is fine for me. Basically I'm just including the regulator free.

[BenelliSEI]

FYI…… Here’s what the panel on my K1 looks like today. I need to clean the terminals on that solenoid next!

[God of Thunder]

FYI…… Here’s what the panel on my K1 looks like today. I need to clean the terminals on that solenoid next!

Benelli! Thanks for the photo. I can see where they removed the fuse on mine, and just connected the two red wires....lovely!


If I may ask - I'm trying to diagnose the spark issue, and I don't appear to have 12v getting to the coils. Can anyone confirm on the K1, does 12v come in via the black/white wires?

[BenelliSEI]

FYI…… Here’s what the panel on my K1 looks like today. I need to clean the terminals on that solenoid next!

Benelli! Thanks for the photo. I can see where they removed the fuse on mine, and just connected the two red wires....lovely!


If I may ask - I'm trying to diagnose the spark issue, and I don't appear to have 12v getting to the coils. Can anyone confirm on the K1, does 12v come in via the black/white wires?

That is correct. From the key switch, through the kill switch, I believe.

[BenelliSEI]

If you go to the front page of this forum and search the manuals for your bike, you will find the best colour drawing. I usually make my self a colour copy for the shop, at least 2 X the regular size. If you plan on replacing the harness, you will need it.

[Don R]

 If those carbs are Kawasaki Mikunis which I believe they are, and the carb rubbers fit the Kawasaki spacing, hang onto those carb rubbers. If they are the adapter ones, they are unobtanium and useful to fit 29 smoothbore carbs to a cb750 engine.

[Don R]

 I like to print the color wiring diagram on two pages and paste it to a cut up soda carton (beer) so it can stand up and be read while my hands are full of wiring.

 And, nice find and welcome back.

[BenelliSEI]

If those carbs are Kawasaki Mikunis which I believe they are, and the carb rubbers fit the Kawasaki spacing, hang onto those carb rubbers. If they are the adapter ones, they are unobtanium and useful to fit 29 smoothbore carbs to a cb750 engine.

Don…. I think I came across a set of those yesterday. Need them?

[God of Thunder]

FYI…… Here’s what the panel on my K1 looks like today. I need to clean the terminals on that solenoid next!

Benelli! Thanks for the photo. I can see where they removed the fuse on mine, and just connected the two red wires....lovely!


If I may ask - I'm trying to diagnose the spark issue, and I don't appear to have 12v getting to the coils. Can anyone confirm on the K1, does 12v come in via the black/white wires?

That is correct. From the key switch, through the kill switch, I believe.

Thank you!!! I was able to identify that I do NOT have 12v at the two black/white wires. I put 12v to them - and now - I HAVE SPARK! This is phenomenal as a new harness and not this hacked up job will likely get me to a solid point to finish it with carbs!

[MauiK3]

Wiring diagrams can be so difficult to track!

[God of Thunder]

I like to print the color wiring diagram on two pages and paste it to a cut up soda carton (beer) so it can stand up and be read while my hands are full of wiring.

 And, nice find and welcome back.

Don! So great to see you again!!

I'll take better photos of the carbs once I get back to them!

[God of Thunder]

In other news - today - 2/11/24 - I went out and put 12v to the coils again, put a dash of starting fluid across all of the openings, gave it a shot - and she did start up extremely briefly!!!! The battery is incredibly low - and will turn the engine over for maybe 4-5 seconds before it has to be charged again - but nonetheless, I heard it for a brief moment!

[BallAquatics]

In other news - today - 2/11/24 - I went out and put 12v to the coils again, put a dash of starting fluid across all of the openings, gave it a shot - and she did start up extremely briefly!!!! The battery is incredibly low - and will turn the engine over for maybe 4-5 seconds before it has to be charged again - but nonetheless, I heard it for a brief moment!

That's cool     When you know you have a runner, it makes the rest of the work easier. ( Does for me anyway  LOL )

[God of Thunder]

In other news - today - 2/11/24 - I went out and put 12v to the coils again, put a dash of starting fluid across all of the openings, gave it a shot - and she did start up extremely briefly!!!! The battery is incredibly low - and will turn the engine over for maybe 4-5 seconds before it has to be charged again - but nonetheless, I heard it for a brief moment!

That's cool     When you know you have a runner, it makes the rest of the work easier. ( Does for me anyway  LOL )

You're not wrong - made the enjoyment a lot better! It should warm up tomorrow or Tuesday, and then I should be able to get it runnign for 10-15 seconds to truly hear how it sounds! I'll make a video and continue to cross my fingers!

[Phoenix]

I would update to the new fuses.  I was out of state, using a cigarette wrapper for a fuse, driving from one parts store to another trying to find glass fuses.  They are somewhat rare.

[HondaMan]

I would update to the new fuses.  I was out of state, using a cigarette wrapper for a fuse, driving from one parts store to another trying to find glass fuses.  They are somewhat rare.

Yep, especially since the type (SFE) hasn't been made in the original automotive vibration-proof form since the 1990s!
There's some out there now that carry the "SFE" legend on them, but they are just normal fuses with thickly-shaped elements. They are not vibration-rated.

[God of Thunder]

If those carbs are Kawasaki Mikunis which I believe they are, and the carb rubbers fit the Kawasaki spacing, hang onto those carb rubbers. If they are the adapter ones, they are unobtanium and useful to fit 29 smoothbore carbs to a cb750 engine.

Here are a few shots of the carbs. I've only got 3 of the 4 rubbers so I can't truly try them on there yet!

[Stev-o]

The battery is incredibly low...

FYI - these bikes need a good battery to provide spark and run correctly. How old is your battery?

[God of Thunder]

Been awhile since we’ve made some progress on this one! Friday - I finally got the bike back to my house along-side the K6. I finally got the new harness put in - and that was a chore. Most of the things inside the headlight bucket aren’t working right now - including the horn. Unfortunately there was many wires cut/spliced in - so I am 100% sure that I’ll have to go through and figure those out - or order new repro controls so I can get everything to match up.

With that said - the engine does turn over with the new harness! So I had to hook up the battery pack and see what we could get! It took some effort - but check her out! Additionally - I’d love to know what you think the black stuff is!?!