Author Topic: Starting a K8 project with almost no mechanical aptitude...what could go wrong? (Read 5481 times)

newday777 · « **Reply #50 on:** July 15, 2023, 02:57:26 AM »

Clean the clips with some Deoxit and a brass .17 cal gun cleaning brush and it should get you by for a bit.

http://forums.sohc4.net/index.php?topic=95777.0

MauiK3 · « **Reply #51 on:** July 15, 2023, 07:51:41 AM »

That looks like some interesting stuff, I'll have to try it.
The fuse block looks fine!

denward17 · « **Reply #52 on:** July 21, 2023, 03:10:45 PM »

Nick, Pic for you......

scubanerdnick · « **Reply #53 on:** July 21, 2023, 03:21:46 PM »

Dennis - that's rad! Thanks so much for sharing that with me. There were obviously a few modifications to the wiring from before so I wanted to see what this looked like and couldn't quite grasp it all. Big difference with yours and how the wires were just jammed into mine. Huge thanks!

Quick question - my fuse block is also open like that, do they have a cover that fits over them like I see in a lot of the aftermarket ones?

denward17 · « **Reply #54 on:** July 21, 2023, 03:36:56 PM »

Yes, mine has a cover, but I took it off for the pic....

scubanerdnick · « **Reply #55 on:** July 21, 2023, 05:25:53 PM »

Okay thanks for showing me. I appreciate it.

scubanerdnick · « **Reply #56 on:** July 22, 2023, 06:26:23 AM »

Gentlemen (are there any lady CB750 riders/owners?) - wondering if anyone can tell me what I'm looking at here. Obviously this is someone's shorthand wiring but I'm confused by what I'm seeing. Doing a bit of research it is maybe the contact breaker wiring? But if so the colors on the wiring diagram do not match what I have.

I have my wiring harness loom out and compared to the new one and they are identical but now I'm noticing this wiring off the rear brake side that I can't quite put reconcile with the wiring harness. Everything is still out so I can compare and I'm taking it slow and visualizing everything before I make a move but this bit was confusing so I thought I'd poll the audience.

Another question - in the second photo you can see they basically wrapped bare wires around a bullet connector of another wire (not good). As I have bullet connectors I can salvage from the other wiring harness is there any concern with taking a good bullet connector off the old harness, cleaning it up, and rewiring it that way or would that be a bad idea?

denward17 · « **Reply #57 on:** July 22, 2023, 07:17:54 AM »

Maybe it was added for electronic ignition?

There's where I added a wire for mine.

scubanerdnick · « **Reply #58 on:** July 22, 2023, 07:47:24 AM »

Quote from: denward17 on July 22, 2023, 07:17:54 AM

Maybe it was added for electronic ignition?

There's where I added a wire for mine.

Dennis - I had not even thought to look but lo and behold there is a Dynatec S Ignition system there. Doing a little research it looks like they for some reason twisted the black (key on wire) into the other wires. I will have to do a bit more research to fully understand it but looks like some good YouTube videos describing what they attempted to do.

seanbarney41 · « **Reply #59 on:** July 22, 2023, 08:39:15 AM »

Yeah, you can salvage used bullets, but it is not ideal. To do this in the past I would splice the wires with solder (takes practice) and then heat shrink over it. Ideal would be to source new bullets and the proper ratcheting crimper (also takes practice but less than soldering)

willbird · « **Reply #60 on:** July 22, 2023, 08:52:34 AM »

Quote from: seanbarney41 on July 22, 2023, 08:39:15 AM

Yeah, you can salvage used bullets, but it is not ideal. To do this in the past I would splice the wires with solder (takes practice) and then heat shrink over it. Ideal would be to source new bullets and the proper ratcheting crimper (also takes practice but less than soldering)

The result will not be OEM but here is what I intend to use for mine.

https://www.amazon.com/dp/B07VF2W6FJ?psc=1&ref=ppx_yo2ov_dt_b_product_details

I have Marks ignition box and proper install of the linked plugs will still allow me to unplug his box and plug the points and condensor back in.

This crimper here works pretty good with the terminals included in the kit linked above.

https://www.amazon.com/dp/B0BKVCQJY7?psc=1&ref=ppx_yo2ov_dt_b_product_details

Bill

denward17 · « **Reply #61 on:** July 22, 2023, 10:19:42 AM »

I got these from Sparck Moto when I installed the electronic ignition, plus some spares.

Description   Unit price   Qty   Amount
25x 3.5mm Bullet Terminal (male) + Insulator
Item# SM3-25   $5.49 USD   1   $5.49 USD
5x 3.5mm Double Socket Terminal + Insulator
Item# DF3-5   $2.99 USD   2   $5.98 USD
25x 3.5mm Socket Terminal (female) + Insulator
Item# SF3-25   $5.49 USD   1   $5.49 USD

scubanerdnick · « **Reply #62 on:** July 22, 2023, 10:44:17 AM »

Looks like VintageConnectors and SparckMoto are the same company and both are out of town until first week in August. So guess I'll move on to something else while I wait for them to get back.

I may go ahead and see what I can get out of salvaging one of the old connectors. I understand it's not ideal but either way I have to wait so if it works then okay and I know I need to eventually replace it, or I wait anyway until they return in a couple weeks. Can't hurt. The old wiring harness and some spare wire allows me to practice crimping and maybe even some soldering before I do it right.

In the mean time I still have some other stuff I can knock out. Marathon, not a sprint.

seanbarney41 · « **Reply #63 on:** July 22, 2023, 10:48:03 AM »

For sure, even twisting wires together and taping works in a pinch...just fix it right before you get stranded somewhere

scubanerdnick · « **Reply #64 on:** July 22, 2023, 03:09:39 PM »

So generally speaking is there any difference between the 3.9mm and 3.5mm connectors? I took a look at both harnesses and at the electronic ignition and it appears as if the ignition connectors use the 3.9mm male connectors and they maybe stretched/opened the female connectors on the wiring harness to accommodate the larger diameter connectors. When I get the new connectors I ordered is there anything wrong with just changing out the 3.9mm with 3.5mm so I've got the same size connectors throughout?

RAFster122s · « **Reply #65 on:** July 22, 2023, 05:42:54 PM »

Stretched 3.5 to 3.9 will work, but the contact is not going to be as good as 3.5 to 3.5 bullet connector would be... Changing them to all be 3.5mm is the way to go.

scubanerdnick · « **Reply #66 on:** July 22, 2023, 05:44:22 PM »

Thanks! I figured that was the case but wanted to make sure just in case there was something unique about those wires/sizes/etc.

scubanerdnick · « **Reply #67 on:** July 23, 2023, 07:12:22 AM »

Gents - Good morning all. Hope you've all had a great weekend.

So yesterday (all my troubles seemed so far away..) I spent a lot of the day doing some small jobs while I wait for the necessary electrical connections/connectors to come in. Mainly I was going to try to figure out where there is sooo much duct tape on various hoses and wires on this bike. Anyway I found that my breather hose (from the crankshaft case (?), top of engine) had duct tape on it so I decided to find out why and sure enough it was two pieces of 3/8" hose joined together and taped up.

Now I did a lot of reading on these forums last night to try to figure out how the hose was supposed to be routed. Seems like historically this has been a hot topic. So I'll not contribute to it further and just re-do what was there before...but I have some questions on the hose itself.

What was on my bike was 3/8" SAE hose connected to the top of the engine by a standard screw clamp like you'd use in a number of other applications. I can from CMSNL that the clamp is wrong but what about the hose diameter? I cannot find any information on what it should be only that it is called a breather hose. Is 3/8" the right diameter and does anyone have any other hose recommendations since I'm going to replace it? Would heater hose from an auto parts hose work?

grcamna2 · « **Reply #68 on:** July 23, 2023, 08:31:01 AM »

Quote from: scubanerdnick on July 23, 2023, 07:12:22 AM

Gents - Good morning all. Hope you've all had a great weekend.

So yesterday (all my troubles seemed so far away..) I spent a lot of the day doing some small jobs while I wait for the necessary electrical connections/connectors to come in. Mainly I was going to try to figure out where there is sooo much duct tape on various hoses and wires on this bike. Anyway I found that my breather hose (from the crankshaft case (?), top of engine) had duct tape on it so I decided to find out why and sure enough it was two pieces of 3/8" hose joined together and taped up.

Now I did a lot of reading on these forums last night to try to figure out how the hose was supposed to be routed. Seems like historically this has been a hot topic. So I'll not contribute to it further and just re-do what was there before...but I have some questions on the hose itself.

What was on my bike was 3/8" SAE hose connected to the top of the engine by a standard screw clamp like you'd use in a number of other applications. I can from CMSNL that the clamp is wrong but what about the hose diameter? I cannot find any information on what it should be only that it is called a breather hose. Is 3/8" the right diameter and does anyone have any other hose recommendations since I'm going to replace it? Would heater hose from an auto parts hose work?

A good Honda dealer parts person will be able to see the correct OEM hose for the breather on his screen and order it for you,if it's still available;either way,you'll get a part number to identify the correct size hose.

scubanerdnick · « **Reply #69 on:** July 23, 2023, 08:37:34 AM »

Quote from: grcamna2 on July 23, 2023, 08:31:01 AM

Quote from: scubanerdnick on July 23, 2023, 07:12:22 AM
Gents - Good morning all. Hope you've all had a great weekend.

So yesterday (all my troubles seemed so far away..) I spent a lot of the day doing some small jobs while I wait for the necessary electrical connections/connectors to come in. Mainly I was going to try to figure out where there is sooo much duct tape on various hoses and wires on this bike. Anyway I found that my breather hose (from the crankshaft case (?), top of engine) had duct tape on it so I decided to find out why and sure enough it was two pieces of 3/8" hose joined together and taped up.

Now I did a lot of reading on these forums last night to try to figure out how the hose was supposed to be routed. Seems like historically this has been a hot topic. So I'll not contribute to it further and just re-do what was there before...but I have some questions on the hose itself.

What was on my bike was 3/8" SAE hose connected to the top of the engine by a standard screw clamp like you'd use in a number of other applications. I can from CMSNL that the clamp is wrong but what about the hose diameter? I cannot find any information on what it should be only that it is called a breather hose. Is 3/8" the right diameter and does anyone have any other hose recommendations since I'm going to replace it? Would heater hose from an auto parts hose work?

A good Honda dealer parts person will be able to see the correct OEM hose for the breather on his screen and order it for you,if it's still available;either way,you'll get a part number to identify the correct size hose.

I'll give that a shot. Thanks!

grcamna2 · « **Reply #70 on:** July 23, 2023, 10:36:58 AM »

Quote from: scubanerdnick on July 23, 2023, 08:37:34 AM

Quote from: grcamna2 on July 23, 2023, 08:31:01 AM
Quote from: scubanerdnick on July 23, 2023, 07:12:22 AM
Gents - Good morning all. Hope you've all had a great weekend.

So yesterday (all my troubles seemed so far away..) I spent a lot of the day doing some small jobs while I wait for the necessary electrical connections/connectors to come in. Mainly I was going to try to figure out where there is sooo much duct tape on various hoses and wires on this bike. Anyway I found that my breather hose (from the crankshaft case (?), top of engine) had duct tape on it so I decided to find out why and sure enough it was two pieces of 3/8" hose joined together and taped up.

Now I did a lot of reading on these forums last night to try to figure out how the hose was supposed to be routed. Seems like historically this has been a hot topic. So I'll not contribute to it further and just re-do what was there before...but I have some questions on the hose itself.

What was on my bike was 3/8" SAE hose connected to the top of the engine by a standard screw clamp like you'd use in a number of other applications. I can from CMSNL that the clamp is wrong but what about the hose diameter? I cannot find any information on what it should be only that it is called a breather hose. Is 3/8" the right diameter and does anyone have any other hose recommendations since I'm going to replace it? Would heater hose from an auto parts hose work?

A good Honda dealer parts person will be able to see the correct OEM hose for the breather on his screen and order it for you,if it's still available;either way,you'll get a part number to identify the correct size hose.

I'll give that a shot. Thanks!

That's how I did it;I think the minimum they sell is a 4' length of it.

newday777 · « **Reply #71 on:** July 23, 2023, 12:08:06 PM »

Unfortunately there isn't a reference to size in the parts numbers. #8

scubanerdnick · « **Reply #72 on:** July 23, 2023, 02:02:38 PM »

Can anyone tell me which way the front sprocket is supposed to set? It has a flat side and a raised side. The CMSL diagram appears to show the flat side being out (facing away from motor) but I watched a video on someone working on a CB750 and his was oriented the opposite way.

newday777 · « **Reply #73 on:** July 23, 2023, 02:19:03 PM »

Flat out

newday777 · « **Reply #74 on:** July 23, 2023, 02:28:44 PM »

I had to go through my pictures to see if I had a shot of my K8 front sprocket.

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Author Topic: Starting a K8 project with almost no mechanical aptitude...what could go wrong? (Read 5481 times)