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Author Topic: CB360 w/slow crank after rebiild  (Read 636 times)

Offline stu.belshe

  • Posts: 126
CB360 w/slow crank after rebiild
« on: Jul 31, 2018, 14:50:14 »
Engine rebuilt on my CB360 project. While trying to test fire, I noticed the electric start only generated a really slow crank. So I tried manually kicking it to see if the cam was tight, but the kick felt normal and the bike fired.

- Battery is new, it's not even a standard bike battery, it's a bench test battery, a car battery at that.
- I jumped the solenoid and same result
- I tried multiple ground points
- I've tried 2 different starters, same issue

Any other ideas or anyone seen this before? I read a bit about the potential for quality wire issues. I'm using new 8AWG copper, I've used it on other bikes, including 360's with no issues.

Thanks
'72 CB350
'74 CB360

View my builds and bikes on Instagram @ instagram.com/standardvmoto/

Offline Sonreir

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Re: CB360 w/slow crank after rebiild
« Reply #1 on: Aug 14, 2018, 14:31:24 »
Might be a grounding issue, especially if you've been painting. Ensure the ground strap has a good solid metal-to-metal connection between the battery and the engine cases.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline stu.belshe

  • Posts: 126
Re: CB360 w/slow crank after rebiild
« Reply #2 on: Aug 14, 2018, 14:36:03 »
Thanks. I've changed the ground twice, but that's not to say it's resolved, I've chased bad grounds further than that.

I have this stripped down to nothing on the bike but the motor, solenoid, battery and starter. Is the absence of some additional component a potential problem? None that I can think of but I'm pretty much out of ideas so I'm stretching.
'72 CB350
'74 CB360

View my builds and bikes on Instagram @ instagram.com/standardvmoto/

Offline Sonreir

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  • Oregon
Re: CB360 w/slow crank after rebiild
« Reply #3 on: Aug 14, 2018, 14:52:55 »
If the battery and the wiring are good, the leaves just something with the starter motor...
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline stu.belshe

  • Posts: 126
Re: CB360 w/slow crank after rebiild
« Reply #4 on: Aug 14, 2018, 14:55:30 »
That was what I thought as well, I've tried two separate ones with the same result. Ever seen any load issues with 8AWG with thin brains as apposed to 8AWG with thick braids? I've used thin braids before with no issues, but that's the only non-stock item here aside from the battery.
'72 CB350
'74 CB360

View my builds and bikes on Instagram @ instagram.com/standardvmoto/

Offline Sonreir

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  • Oregon
Re: CB360 w/slow crank after rebiild
« Reply #5 on: Aug 14, 2018, 15:36:39 »
I usually use 8 AWG for wiring of the starter motor as well. I've used 10 gauge a few times and that has worked, too.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline stu.belshe

  • Posts: 126
Re: CB360 w/slow crank after rebiild
« Reply #6 on: Aug 14, 2018, 15:39:01 »
It has to be the ground or I'm the one unlucky person with 2 bad starters. I guess theres a chance the solenoid is bad, but I've never seen one just run slow, I've only seen them work or not.
'72 CB350
'74 CB360

View my builds and bikes on Instagram @ instagram.com/standardvmoto/

Offline Sonreir

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  • Posts: 10915
  • Oregon
Re: CB360 w/slow crank after rebiild
« Reply #7 on: Aug 14, 2018, 15:46:58 »
If you've bridged the solenoid (solidly) with a box wrench or similar and the starter still won't engage, then you know that's not the issue.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline stu.belshe

  • Posts: 126
Re: CB360 w/slow crank after rebiild
« Reply #8 on: Aug 14, 2018, 15:47:51 »
True, and that has been done. Ground or starter.
'72 CB350
'74 CB360

View my builds and bikes on Instagram @ instagram.com/standardvmoto/

Offline Sonreir

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  • Posts: 10915
  • Oregon
Re: CB360 w/slow crank after rebiild
« Reply #9 on: Aug 14, 2018, 16:05:51 »
That's my feeling as well.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys