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Author Topic: CB360 spark problems  (Read 1412 times)

Offline crazypj

  • Posts: 13199
  • Split personality, I fake being smart
Re: CB360 spark problems
« Reply #30 on: Aug 06, 2018, 14:21:13 »
Depending where you are in the world, indicator bulbs vary between 18w and 23w. Headlight bulb will work as well but if you have a dead short it gets a bit bright and a bit hot. Headlights are usually 35~65w plus, it has a higher amp draw so battery voltage will drop faster (over 5amps for 65w, 12v bulb)
'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

Online Sonreir

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Re: CB360 spark problems
« Reply #31 on: Aug 06, 2018, 14:31:15 »
Still 0 Ohms with the multimeter set to 200, damn! Hopefully I'll be able to get my money back through ebay/paypal.

I did check the secondary resistance too (green wire to plug cap) and I have a correct 14.6 ohms

Looks like you have CDI ignition coils. You'll definitely want to get those replaced.
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Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #32 on: Aug 06, 2018, 15:46:54 »
Looks like you have CDI ignition coils. You'll definitely want to get those replaced.

Hum, the seller I bought the coils from advertised them as perfectly compatible with the 1976 CB360... as a direct swap from the OEM ones, I will need to get my money back...

Theses should fit without problems right ? Plus I already bough from 4into1 and I know they are reliable, although I need to pay 30% of custom taxes to france.

https://4into1.com/ignition-coils-and-caps-honda-cb-cl-sl350k-cb-cl-cj360/

Quote
Depending where you are in the world, indicator bulbs vary between 18w and 23w. Headlight bulb will work as well but if you have a dead short it gets a bit bright and a bit hot. Headlights are usually 35~65w plus, it has a higher amp draw so battery voltage will drop faster (over 5amps for 65w, 12v bulb)

That is good to know thanks, there is no chance of frying the bulb of the indicator doing so?
'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 crazypj

  • Posts: 13199
  • Split personality, I fake being smart
Re: CB360 spark problems
« Reply #33 on: Aug 06, 2018, 19:29:57 »
Only if you drop it  ;D High load or dead short will just make it light up as normal, it should dim if everything is OK as whatever load you have on circuit will 'share' the voltage
'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 tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #34 on: Aug 08, 2018, 11:29:30 »
Haha okay, nice trick anyway :)

I just sent back my faulty coils, waiting to receive my new set of 5 ohms coils from 4into1 to test everything again.
'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 #35 on: Aug 21, 2018, 07:08:35 »
So I just came back from a week of hollidays (I spent working on my CX500 at my parents place :) )and received my brand new coils, these one are finally fine: a good 5 ohms primary and also my new 15A fuses.

I installed everything on the bike, first of all, I do not blow fuses anymore, even with the headlights on! so this is good.

However, I still have no spark at all on the right cylinder, I do have a blue spark on the left cylinder.

When I did the ignition timing, I only replaced the left contact breaker (because the brand new right one I received was faulty with wrong holes for bolts...), could this be the problem? or maybe the contact gap is incorrect?

Here is a quick slow motion video of the contact breakers when trying to start the bike, I can see sparks on both side:
 
'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 #36 on: Aug 21, 2018, 10:08:57 »
Do you have capacitors on there?  Doesn't look like by those sparks.  Do you have resistor caps and do they both check out?  If you're getting spark at the points, power to both coils, but no spark at the plug, then the problem is your plug wire- either where it connects to the coil or the cap.  Also a chance you have a fouled plug, so check that too.

Offline tahitianrider

  • Posts: 43
    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #37 on: Aug 21, 2018, 11:06:54 »
I finally figured it out!! well to be honnest the potential problem has been mentionned before here, but when I check it the first I've somehow not seen it.

I tried to start without the points cover and boom, perfect sparks!
So I cheked the wires again and they were not shortening to the cover... but then I check the connector of the wire to the contact breaker of the right cylinder, and it is the connector that was touching the cover so making a short and so no spark on the right cylinder!
So I pushed the connector further back inside, put back the cover and the bike fired up perfectly at first try!! :)

I feel so stupid for not seeing this the first time, plus you guys mentionned the problems with wires touching the points cover.

The bike idle smoothly and is no longer running on one cylinder at idle :) I'm going for a test ride right now !
'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 #38 on: Aug 21, 2018, 11:10:48 »
I paint the inside of my points covers with liquid tape.  Just a little extra insurance against shorting.

Offline tahitianrider

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    • tomracingdesigns.com
Re: CB360 spark problems
« Reply #39 on: Aug 21, 2018, 11:38:14 »
That's a great idea! I had the exact same one I thought "hum I should liquid tape the inside of the points cover", I was worried the performix liquid tape would not hold the heat but if you don't have any problems I'll do it too :)

I just came back from the test drive: the bike runs perfectly!!
Before it was bogging as hell, I couldn't rev the bike properly and it was running on one cylinder at idle, plus it was stalling when not and would not restart...

Now that I did the ignition timing, new coils, condenser & plugs, plus I fully rebuild the carbs and gas tank, the bike is perfect I love it :)

Thanks a lot for your help on this 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