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Author Topic: 1974 CB360 Engine Troubles (I think)  (Read 10023 times)

Offline redwillissuperman

  • Posts: 997
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Re: 1974 CB360 Engine Troubles (I think)
« Reply #10 on: May 13, 2017, 22:38:28 »
Some other quick things to try:

While the engine is running, squirt carb cleaner into right carb throat. If the right cylinder fires, you have a fueling issue.

These aren't "fixes" but it's an easy way to pinpoint your problem areas.


Offline redwillissuperman

  • Posts: 997
  • Keep it simple- engine, wheels, bars
Re: 1974 CB360 Engine Troubles (I think)
« Reply #11 on: May 13, 2017, 22:39:01 »
Also, NEVER RUN ENGINE ON SIDE STAND- only center stand.

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #12 on: May 13, 2017, 23:11:49 »
Here we go, let the attitude begin.  Good luck, my man.  I hope you get it sorted.  Maybe when we're allowed to, we'll talk about how to diagnose certain symptoms.  But for now, listen to mom.

Haha I knew I would catch hell when I wrote that.   ;)
Its just the guy is talking about buying coils...When hes got blue smoke and oil out of the right cylinder and a ticking sound from top of engine.

Which reminds me...first thing is a compression test.  I believe I have read guys post.  They have rented compression gauge from Autozone etc.
Or buy a compression test gauge.
So do a compression test.  Your valves may be out of adjustment. (ticking sound)  If a seal or guide is worn this can cause oil to enter cylinder.  OR it may need fresh piston rings and bore work OR you may have a bent or cracked valve.

Test compression, Adjust cam chain tension.  Then check valve clearances. etc

Once youve solved the blue smoke and oil problem.  Then start looking at the rest of your list.
« Last Edit: May 13, 2017, 23:29:06 by trek97 »

Offline rsjudka

  • Posts: 92
Re: 1974 CB360 Engine Troubles (I think)
« Reply #13 on: May 13, 2017, 23:50:11 »
Thanks guys for the all the advice so far! I'm going to order all the tools to do the regular maintenance first, and then see whats next.

And sorry guys about all the questions, I've just been reading up so much online about people with similar issues and thought I was heading in the right direction (for example, replacing the coils :-[)

Just out of curiosity, because I may have done this a few times, how bad is it to run the engine on the side stand?

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #14 on: May 14, 2017, 00:39:57 »
As long as the oil is kept at proper level and the bike is sitting on level-ish ground its not an issue, to idle on side stand for a little bit.  But for maintenance stuff it should be done on center stand.  Honda had a bulletin come out in 1976 that recommended changing the oil pickup to a better later design. (CJ360 oil pickup)  To prevent it drawing air when idling on side stand.  If it does draw enough air to run head dry, the head and camshaft will be toast.  Seems it can happen pretty quickly.  I have the later, improved CJ360 pickup installed in mine.  And I still avoid letting it idle on sidestand.

Also, the early 360s (yours 1974) had a cam chain guide recall.  If the guide was replaced by dealer your engine # on the case will have punch mark on it.

Yep, make sure the engine is runnable first.  Then concentrate on getting it running.

Like I posted before Autozone may be able to loan you the compression gauge.  If you find compression is low.  Say, 140 or less add a teaspoon of oil in the sparkplug hole and try it again.  If compression tests higher, this shows worn rings/cylinder.  If compression remains the same you may have a leaking valve.
« Last Edit: May 14, 2017, 01:00:15 by trek97 »

Offline rsjudka

  • Posts: 92
Re: 1974 CB360 Engine Troubles (I think)
« Reply #15 on: May 14, 2017, 01:43:23 »
Yeah I read about the cam chain guide recall, thankfully my bike has that punch  ;D

Thanks for the tip about the compression test.

I won't have any time this week to work on the bike (starting an internship :) ), but as soon as the weekend comes I'll get on it 8)

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #16 on: May 14, 2017, 08:55:14 »
The best way to do a compression test on 360 w CV carbs is pulling the carbs off.   

Im sure youve read plenty about the top end oiling issues.  You could also pick up a tube of 3-bond.  You will need it to re-seal the head cover, when you change out the leaky cam shaft seal behind the points and advancer.  Since you have that seal you could dig into that and take a peek at your cam and tappet surfaces to ensure its not eaten up by running dry.
When you install the oil seal be sure to lube it up pretty good.  If rubber oil seals are installed dry.  The friction caused by the rotating parts will instantly burn the sealing edges and it will leak again.
DTT member, "Sonreir" sells the 3 bond at sparckmoto.com

The workshop manual explains how to remove and re-install the head cover in good detail.
 
Keep us up to date w some pics.
good luck.

Offline rsjudka

  • Posts: 92
Re: 1974 CB360 Engine Troubles (I think)
« Reply #17 on: May 26, 2017, 21:57:31 »
Sorry everyone I've been really busy with finals and work and life and haven't really been able to work on the bike until today.

I was able to do the compression test, and sadly my bike is at 70 psi on both right and left cylinders :( After adding the oil the readings go up to 85~90psi on both sides. Is this a big enough of a change to show worn rings/cylinders? How low is too low of a reading?

Also, not sure if this affects anything, but I bought the bike with aftermarket mufflers, they look like 16" shorties. Would this affect the compression test?

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #18 on: May 27, 2017, 14:43:45 »
No shorties wont affect readings.  Did you have the carbs off the engine?  If not pull them off and re-test.
Then go through and adjust valves.  Honda manual will tell you how to adj valves.  Valves will be the only adjustment you make w a cold engine.
Then re-test.  And report back.
« Last Edit: May 27, 2017, 14:45:36 by trek97 »

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #19 on: May 27, 2017, 14:46:53 »
The engine wont run if its lower than 90 give or take.