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Author Topic: CB360 spark problems  (Read 1413 times)

Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #10 on: Jul 14, 2018, 11:13:14 »
I tested the secondary again with the other wire that goes to the contact breakers. I get a solid 19.5 on the left and 17.2 on the right , so about the same.
When connecting my 2 meter leads together I get 000.

The leads on the coils are far from clean Indeed but since I have the same secondary Reading with the other wire doesn't that mean that it may not be thé problem ?
'94 BMW K75 Racer
'84 Yamaha XJ 600 "Rocket" Racer
'76 CB 360 old school cafe
'96 CM 125 Brat bike
'80 CX 500 soon to be racer
'K15 MT-07 "The only bike I can actually use everyday" lol
www.tomracingdesigns.com

Online irk miller

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Re: CB360 spark problems
« Reply #11 on: Jul 14, 2018, 11:30:45 »
What setting do you have the meter when testing primary?  It should be on 200.

Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #12 on: Jul 14, 2018, 11:43:33 »
Yes I have it on 200, so does that means that there is a problem with the coils themself and not the leads ?
« Last Edit: Jul 15, 2018, 06:03:52 by tahitianrider »
'94 BMW K75 Racer
'84 Yamaha XJ 600 "Rocket" Racer
'76 CB 360 old school cafe
'96 CM 125 Brat bike
'80 CX 500 soon to be racer
'K15 MT-07 "The only bike I can actually use everyday" lol
www.tomracingdesigns.com

Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #13 on: Jul 31, 2018, 15:22:22 »
So I found a great deal on some coils and installed brand new coils along with new plug wires and cap.

Yet the bike didn't fire up. So I check the right cyl plug: no spark at all, then I wanted to check the left cyl and suddenly no more power at all: the main fuse blew up...
So I'm pretty sure there is a short somewhere... The wires at the points cover seems fine.

The I checked the wiring harness, which was a total mess... The previous owner made this bike a cafe racer and did a terrible job pretty much everywhere. 75% of my work on this bike is about fixing the mistakes he made...

So in the harness, first there are a ton of unplugged female terminals, well I guess that is because he removed all the speedometer and techometer units...
They were somehow insulated though.
BUT I found an unplugged white/red (or green/ red? Im color blind...)wire that was not insulated at all and touching the frame. Givien its color I'm pretty sure it has power and may have cause the short.
I now need to find what this wire is and where to plug it.

Oh and many terminals were loose too which may explain why I had no spark ? But the coils did feel hot when I tried to start previously...
'94 BMW K75 Racer
'84 Yamaha XJ 600 "Rocket" Racer
'76 CB 360 old school cafe
'96 CM 125 Brat bike
'80 CX 500 soon to be racer
'K15 MT-07 "The only bike I can actually use everyday" lol
www.tomracingdesigns.com

Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #14 on: Jul 31, 2018, 15:23:11 »
The wire
'94 BMW K75 Racer
'84 Yamaha XJ 600 "Rocket" Racer
'76 CB 360 old school cafe
'96 CM 125 Brat bike
'80 CX 500 soon to be racer
'K15 MT-07 "The only bike I can actually use everyday" lol
www.tomracingdesigns.com

Offline Maritime

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Re: CB360 spark problems
« Reply #15 on: Jul 31, 2018, 16:43:55 »
that is green w red stripe. look it up on the wiring diagram and see what it does.
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Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #16 on: Jul 31, 2018, 17:52:56 »
So on the wiring diagram there are :
- One green and red wire: this one goes to the starter magnetic switch and the clutch switch.
- One light green and red wire: this one is for the neutral indicator light.

I'm thinking this is the light green and red wire for the neutral light isn't it? Since the previous guys removed all the indicator light and did a terrible job, I would not be surprised if he just let that wire like that after removing the neutral light without even insulating it...
So it may have cause the short and blew up the fuse, but may not be the cause for no spark at all.

Maybe my kill switch is faulty?
Unfortunately I have to wait to receive my new fuses to figure this out
'94 BMW K75 Racer
'84 Yamaha XJ 600 "Rocket" Racer
'76 CB 360 old school cafe
'96 CM 125 Brat bike
'80 CX 500 soon to be racer
'K15 MT-07 "The only bike I can actually use everyday" lol
www.tomracingdesigns.com

Offline raptormeat

  • Posts: 400
Re: CB360 spark problems
« Reply #17 on: Jul 31, 2018, 19:11:10 »
that might be your problem. again, check that condensor mount to ground resistance...the one with all the dust on it...

also, this is worth it, no more fuses.
https://revivalcycles.com/products/waterproof-3-circuit-breaker-block
Minimal CB378 Brat
http://www.dotheton.com/forum/index.php?topic=53242.0

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Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #18 on: Aug 01, 2018, 06:25:55 »
Yes I'll check that, I also have a brand new condensor I didn't installed yet, I will install the new one and check that ground. What should be the resistance from mount to ground?

That circuit breaker looks nice indeed
'94 BMW K75 Racer
'84 Yamaha XJ 600 "Rocket" Racer
'76 CB 360 old school cafe
'96 CM 125 Brat bike
'80 CX 500 soon to be racer
'K15 MT-07 "The only bike I can actually use everyday" lol
www.tomracingdesigns.com

Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #19 on: Aug 02, 2018, 15:57:01 »
So I installed the new condenser and insulated the wires terminal that were not with electrical tape.

I didn't had 15A main fuse so I used a 10A fuse from a CX500 Sport I had laying around,

I turned the ignition key on, it had power for about 30sec, didn't had the time to test for spark before the main fuse blew up again...

I find this weird... it didn't blew main fuses up before... then I changed the coils and it starts blewing up fuses... I mean, if there is a short somewhere on the wiring harness, why did it not happened before?

Oh and do you guys know if the CB uses fast fusion 15A fuses or slow fusion 15A fuses?

Thanks again for all the help
'94 BMW K75 Racer
'84 Yamaha XJ 600 "Rocket" Racer
'76 CB 360 old school cafe
'96 CM 125 Brat bike
'80 CX 500 soon to be racer
'K15 MT-07 "The only bike I can actually use everyday" lol
www.tomracingdesigns.com