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Author Topic: 1974 CB360 Engine Troubles (I think)  (Read 10512 times)

Offline rsjudka

  • Posts: 92
Re: 1974 CB360 Engine Troubles (I think)
« Reply #80 on: Jul 14, 2017, 14:55:13 »
Actually the manual says very little about this procedure if memory serves.

A very important procedure, to make her run properly.
Any tips then? 😬

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #81 on: Jul 14, 2017, 16:31:36 »
Any tips then? 😬

Yes, get your electrics sorted out.  That may give me some time to find or put something together myself.   ;)

Offline rsjudka

  • Posts: 92
Re: 1974 CB360 Engine Troubles (I think)
« Reply #82 on: Jul 15, 2017, 16:13:18 »
Good news!

Today I decided to go through the timing adjustment and carb sync (for the 4th time ) but this time I guess I did it right, because I can go faster than 30 mph now lol

But there are still some problems with it. Occasionally, when I pull the throttle quickly, there is some white smoke coming from the right muffler. I don't see it when I ride normally, only on those quick blips.

The only other issue I noticed was when im slowing down to a stop, the bike dies. Is this an electrical issue?

Also, when I did the timing adjustment, I noticed the right point contact plate isn't flat, like its worn more on one side.

Offline crazypj

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #83 on: Jul 15, 2017, 17:24:40 »
It's more than likely a carb issue.
With stock airbox plus 'paper' filters, (even 'reconditioned' seem to work) the exhaust doesn't seem to matter (it does lean out with short systems requiring 'over size secondary main jets)
The stock carbs cannot simply be up jetted without various modifications if you fit K&N or Uni filters. Cheap 'pods' cause all sorts of issues, main problem is restricted airflow somewhere after 6~7,000 rpm.
You have 'second generation' 3 jet carbs, really the last ones that could be modified relatively easy.
A couple of people have found setting, parts and pieces that work for their set up 
As for one set of points 'wearing' more than the other, pretty normal event, particularly if ignition has been left on when one side points are closed (this can also heat return spring enough to cause miss-firing at lower rpm (generally around 5,000 up)
« Last Edit: Jul 15, 2017, 17:30:03 by crazypj »
'you can take my word for it or argue until you find out I'm right'
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 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
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CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
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Offline rsjudka

  • Posts: 92
Re: 1974 CB360 Engine Troubles (I think)
« Reply #84 on: Jul 15, 2017, 19:54:16 »
It's more than likely a carb issue.
With stock airbox plus 'paper' filters, (even 'reconditioned' seem to work) the exhaust doesn't seem to matter (it does lean out with short systems requiring 'over size secondary main jets)
The stock carbs cannot simply be up jetted without various modifications if you fit K&N or Uni filters. Cheap 'pods' cause all sorts of issues, main problem is restricted airflow somewhere after 6~7,000 rpm.

So I currently have the stock filters and stock mufflers on. Are there any other modifications the PO could have made that's causing the white smoke? Not sure if this matters, but on the right muffler air leaks from a few places.

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #85 on: Jul 16, 2017, 07:53:18 »
Once set correctly carb sync shouldnt change.  As long as lock nut remains locked.

Did you get your battery replaced, charging system working properly AND timing set with a timing light?

As long as points are gapped to spec. and clean.  They should be fine.  Unless as PJ said.  The spring has been compromised due to overheating.

Not sure about white smoke unless youve got a cracked or poorly seated valve.  (blue smoke)
Maybe steam from water condensation evaporating out of the muffler???

(white) smoke is usually seen coming from vent tube in the head cover.  (Steam)  due to water condensation in the oil.

Dying on decel is most likely a lean condition.  You need to adj A/F mix or have dirty jetting, OR vacuum leaks.
« Last Edit: Jul 16, 2017, 08:13:20 by trek97 »

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #86 on: Jul 16, 2017, 08:06:02 »
If you want to make any change, mufflers or filter setup. 
I recommend sending your carbs to crazypj for proper modifications and overhaul.

But before doing that you really need to de-bug her first.  By getting everything set up to run decent and reliable.

A lot of times Electrical issues can "look" like carb problems, and, Carb issues can appear as electrical.
If you start making changes before solving problems they tend to snowball.  And you end up chasing your tail.
Wasting time and money.

Just make sure one system is correct, then move on to the next.
« Last Edit: Jul 16, 2017, 08:11:32 by trek97 »

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #87 on: Jul 16, 2017, 08:24:13 »
One of the very first things I do on my bikes is go through and clean EVERY single electrical connector.

From headlight bucket to tail light to bar controls to neutral switch and every one in between.

It takes some cussing a few hours.  But once its done its done.  And can eliminate a myriad of troublesome issues upfront.


Offline rsjudka

  • Posts: 92
Re: 1974 CB360 Engine Troubles (I think)
« Reply #88 on: Jul 17, 2017, 00:19:36 »
A lot of times Electrical issues can "look" like carb problems, and, Carb issues can appear as electrical.
If you start making changes before solving problems they tend to snowball.  And you end up chasing your tail.
Wasting time and money.

Alright so I'll leave the engine/carbs alone for now and focus on the electrical since thats where it seems things are tripping up.

I'm definitely going to go through and clean all the cables and connectors to eliminate any issues there, and I definitely need a new battery as 48 hours of charging it did nothing for it. I'm planning on getting an AGM battery but I'm not sure how much CCA I need. I read some people saying 140 should be enough, but the on AutoZone the only batteries labeled as "12ah" had a CCA of 200 or higher.

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #89 on: Jul 17, 2017, 08:46:36 »
If you plan on keeping the stock battery box in its stock location.  Just get an agm that fits it properly.
8 - 12ah will give you what you need.