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Author Topic: Dohc Cb750f: possibly a valve issue  (Read 6639 times)

Online pidjones

  • Posts: 882
Re: Dohc Cb750f: possibly a valve issue
« Reply #90 on: Oct 18, 2018, 07:41:59 »
On the machines (sold for around $1.25 M each) I used to work on, we were getting some strange intermitent electrical issues on random circuits. Turned out one of our vendors was using the wrong stripper/crimper combo. They were crimping on the insulation with random contact of the wire to the connector inside the pins. Bugger to chase down. We also cooked some good sized breakers where they had not stripped cables far enough and tightened lug down partially on the insulation. Made contact until real current was drawn through it, then started heating up. So many things can go wrong in wiring. Particularly in connections that rely on compression for current flow.
"Love 'em all.... Let God sort 'em out!"

Offline crazypj

  • Posts: 13388
  • Split personality, I fake being smart
Re: Dohc Cb750f: possibly a valve issue
« Reply #91 on: Oct 18, 2018, 18:29:16 »
Now youíve really got me thinking. The one thing that Iíve assumed is my wiring was good, due to the fact that itís so simple. Iíve got to rewire it anyway, so I might as well pull it all apart and have a look-see.

What is everyoneís recommendations on wiring a bike? Iíve got good tools for crimping and stripping, so I havenít been soldering my connections. Some say thatís fine, but my chopper friends say solder everything. After this experience, Iím thinking solder as much as possible and use less connectors. For example, solder and heat shrink as opposed to bullet connectors.


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Although I've used both (and still do) solder connections can fail due to vibration quicker than crimp connections. As long as wires are clean and crimped properly they are not an issue (plenty of 40+ ye old bikes still running original connectors)  It's easy enough to do a continuity check when bike is hot and cuts out  if removing cover 'cures' problem I would look specifically at the wires from trigger units to control box/coils. Also, check wire routing, I've seen cable clips bent so tight they cut wires and also (again on GS1000) wiring not in clips melted onto exhaust pipe but it only cut out above 80mph when airflow pushed wires onto pipe. At least that wasn't as bad as the GSX cutting out aat sustained 155mph., we ended up giving it back to Suzuki to fix
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline SquidHunter

  • Posts: 109
Re: Dohc Cb750f: possibly a valve issue
« Reply #92 on: Oct 18, 2018, 21:10:27 »
Thereís a very important lesson here. Thanks a lot


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Offline SquidHunter

  • Posts: 109
Re: Dohc Cb750f: possibly a valve issue
« Reply #93 on: Oct 28, 2018, 20:12:15 »
Rode my bike some today. Completely frustrated with the ride, I came home and started digging into the wiring. Sure enough, I had a loose connection. It was the white wire that signals the work coil. Makes sense now.

I should have taken some photos. Ive got the day off tomorrow, so Iím going to attempt to complete the rewire. Iím going to change a few things. 1. Iím going to wire the coils straight to the battery 2. Iím going to wire the regulator/rectifier straight to the battery 3. Iím going to use the least amount of connectors possible


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Offline crazypj

  • Posts: 13388
  • Split personality, I fake being smart
Re: Dohc Cb750f: possibly a valve issue
« Reply #94 on: Oct 29, 2018, 00:15:50 »
If you wire coils direct to battery will you be able to turn them off? Easy fix would be use a relay to get full voltage to coils. I had to do similar on my Katana as it's a known fault that causes overcharging (low voltage to regulator gets 17+volt charge and causes battery to boil dry)
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline J-Rod10

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Re: Dohc Cb750f: possibly a valve issue
« Reply #95 on: Oct 29, 2018, 00:51:15 »
Fused relay is what you want.

Offline SquidHunter

  • Posts: 109
Re: Dohc Cb750f: possibly a valve issue
« Reply #96 on: Oct 29, 2018, 19:43:47 »
Iíve got a fused relay that I was running on my stock coils, to bypass the ignition switch. According to power arc this isnít necessary with their system. The control module turns them on and off 🤷🏻‍♂️. Thatís what they say anyway.

Iím super bummed out. I was supposed to work on it all day today, but got called into work. sigh....


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Offline crazypj

  • Posts: 13388
  • Split personality, I fake being smart
Re: Dohc Cb750f: possibly a valve issue
« Reply #97 on: Oct 29, 2018, 22:04:04 »
Always seems to happen. Either you have time but no money or money but no time. Since looking after grandson I have neither time or money (at least none to do things I want  ;D )
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline SquidHunter

  • Posts: 109
Re: Dohc Cb750f: possibly a valve issue
« Reply #98 on: Oct 31, 2018, 00:04:16 »
Always seems to happen. Either you have time but no money or money but no time. Since looking after grandson I have neither time or money (at least none to do things I want  ;D )

I bet grandkids are rad tho. Iíve got a 4 yo son. Itís pretty fun, but grandkids seem more fun


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Offline crazypj

  • Posts: 13388
  • Split personality, I fake being smart
Re: Dohc Cb750f: possibly a valve issue
« Reply #99 on: Oct 31, 2018, 12:43:05 »
I've been looking after him for 2yrs, he was 3 couple of weeks ago.Much harder work than I expected but mostly great fun. Here is is this morning and a couple of days ago before haircut with Nana's sunglasses  ;D   Kinda surprised how well the 10 yr old 'Kid Tough' camera works, his cousin had it when she was about same age (she's 15 now) 
« Last Edit: Oct 31, 2018, 12:45:59 by crazypj »
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0