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Author Topic: 1974 CB360 Engine Troubles (I think)  (Read 3952 times)

Offline irk miller

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #60 on: Jul 11, 2017, 08:45:41 »
Since you have the plugs out, stick your finger over the hole.  When it wants to blow your finger off the hole, you'll know you're on the compression stroke.  Then, go to your mark.

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #61 on: Jul 11, 2017, 08:51:00 »
Easiest and quickest way Ive found to adjust static timing.
1.  set the gap on left point to open spec distance.  I start at either .12 or .14.  I think specs say 12-16.

2.  next, use your light or I prefer to use meter.  Rotate plate til Left opens on LF exactly.  snug plate down & rotate engine counterclockwise

3.  Then without using your feeler gauge.  Simply, tweak right point gap until it opens exactly on L, it should "automatically" fall within .12-16 specs. 

If right turns out to be more or less than 12-16, start over w step  1.  This time set Left to open either .12 OR .16 gap...repeat steps 2 & 3.

If you adjust Left throughout the .12 -.16 range, opening exactly on LF and find you just cant get Right within spec opening on L,   replace worn points.

If points are set less than .12 they will remain closed to long allowing the coil to heat up and fry.  (not enough cool down time between charging cycles)

If open beyond .16 the coils will have less time to charge = weak spark.

Step 4, start bike put your strobe on it and adjust plate for proper operation.  Recheck gaps. done.

Offline crazypj

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #62 on: Jul 11, 2017, 17:14:09 »
I don't have anything to test the battery, but I'm going to take the battery the Auto Zone to get it tested. And if they say the battery is good, then I'll rent a tester and test on the bike.

So when the bike idles the ticking is gone, but with any pull on the throttle the ticking comes back. I've watched a few cb360 test ride videos on youtube and the ticking can sometimes be heard, is that normal?

For the timing adjustment, you first check left side on the compression stroke at the LF mark then rotate 180° to the F mark, or would you first rotate a whole revolution and then go to the F mark?


You can get a multi-meter that's good enough for checking electrics for about $5.00 so not having a tester is poor excuse. Load testing isn't really needed, if yu use electric starter about 4~5 times then it won't hold high enough voltage to crank and spark on 6~7 attempt, battery is shot. (takes around 60 amps to get motor started spinning then less than 40A to keep it spinning)

The crank turns twice for the cam to turn one full360 degree rotation. TDC comes up twice, onece with both valves closed, once with both valves slightly open (intake is opening exhaust is closing)

The best way to find actual TDC C (compression) is to watch intake valve go down then as it comes up your getting the correct position to do valve adjustment or ignition timing. It's quicker to just watch valve on each cylinder than messing around nd getting timing marks right but on wrong rotation
« Last Edit: Jul 11, 2017, 17:20:04 by crazypj »
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CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
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Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #63 on: Jul 11, 2017, 19:50:00 »
So I went a got a multimeter and at idle the test reads 12v and while revving the highest it went up to was ~12.6v

However, I was unable to start the bike using the electric starter, I had to kick start it.

Is it time for a battery replacement? Regulator/rectifier upgrade? Both?

Offline Sonreir™

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #64 on: Jul 11, 2017, 20:03:02 »
Possibly both. I'd try the battery first. Sometimes a dead battery can suck a lot of juice out of your system, which causes an overall voltage drop.
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Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #65 on: Jul 11, 2017, 22:53:03 »
So I re-did my timing adjustment because I don't feel like I did it right the first time based on what trek said. I'm pretty sure I've taken a step backwards because one of the mufflers is getting hot (and a clean spark plug) while the other one is staying cold (and a carbon fouled spark plug). Is there any way to know you set the timing "correctly"?

Because I re-did the timing, does that mean the carbs need to be resynced again?   :'(

And on the topic of the battery, I can get the bike to start up about 3 times (bike only idles for about 5 seconds then dies) using the electric starter, then after that its dead. Is the battery done?


Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #67 on: Jul 11, 2017, 23:55:04 »
Also forgot to mention, after I did the timing adjustment I tested with the multi meter at idle and while revving and it was reading 11 and around 11.3 respectively

Offline crazypj

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #68 on: Jul 13, 2017, 17:51:10 »
Voltages are low but battery may recover with a decent charge. Needs 48~72 hrs at a low amperage (1amp or slightly less)
 Check various 'wall warts' you already have to see if any are 12v 6~800 milliamps then connect it up for a few days.
 Batteries charge in two ways, surface charge where you have the surface of plates holding a voltage and deep charge where the entire 'body' of plate is holding voltage and full amperage.  Battery should be around 13.2 volts when fully charged and stay at that voltage at least 24 hrs (may be slightly higher initially, up to 14V is OK)
It's always interesting to check cranking voltage. If battery is good it won't drop below 12v. If OK but on the way out, around 11~11.5
Lower than 10v cranking means battery is definitely on the way out although not using electric start could easily get you another year or so out of it.
You need a fully charged battery to be able to do proper charging checks (although I would check rectifier connections, in block and at unit).
« Last Edit: Jul 13, 2017, 17:52:59 by crazypj »
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 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
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #69 on: Jul 13, 2017, 23:41:02 »
Thanks for all the info about batteries PJ. So I was charging my battery and about 30 minutes into the charge my whole garage smelled like that rotten egg smell, so I'm just going to replace the battery to be on the safe side.

Before that, I did redo my points adjustment (3 times now) and synced my carbs.

It idles alot better now, also feel full power while idling.

However, when I take it out for a ride, anything past 1/2 throttle open has no power.
« Last Edit: Jul 13, 2017, 23:47:03 by rsjudka »