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Author Topic: 1974 CB360 Engine Troubles (I think)  (Read 8506 times)

Online trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #70 on: Jul 14, 2017, 07:47:56 »
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.


CV carbs on the 360, so throttle position has little to no meaning. 

At what rpm does it seem to lose power?  between 2500 and 5000rpm?


Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #71 on: Jul 14, 2017, 07:58:23 »
I would say yes, closer to around 3k (sorry don't have a tach yet)

Online trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #72 on: Jul 14, 2017, 08:05:12 »
Did you check timing w a strobe to ensure you get full advance at 3000rpm?

Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #73 on: Jul 14, 2017, 08:29:55 »
Did you check timing w a strobe to ensure you get full advance at 3000rpm?
How would you do that? And what exactly does "full advance" mean?

Online trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #74 on: Jul 14, 2017, 08:47:52 »
First get your electrical sorted and buttoned up.  Then...

Pics From the workshop manual.




As engine rpm increases the advancer (located behind points plate) will cause the ignition to advance, keeping sparkplugs firing when they need to.  Otherwise it will overheat and/or lack power.

Around 3000 rpm, the timing mark on the stator should fall on or between the 2 advance marks. (no more, no less)  As shown above.

If it doesnt you will need to service, repair or replace advancer.



This can ONLY be checked using a stroboscopic timing light.
https://www.harborfreight.com/timing-light-with-advance-40963.html

Static timing is nothing more than a way to initially get the bike started and running.  Then you MUST fine tune the timing w a strobe light in order to get it dialed in to running properly.

   

Online trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #75 on: Jul 14, 2017, 08:54:40 »
If its in the advancer.  Most likely old sticky grease or worn springs.  If its the springs (stretched and loose fitting), sometimes you can cut a coil out and bend the next coil to fit.  Or just disassemble clean and re-grease.

« Last Edit: Jul 14, 2017, 08:56:24 by trek97 »

Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #76 on: Jul 14, 2017, 09:30:04 »
So I set the timing gap with the strobe, but I don't understand how I would fine tune it for the advancer marks.

Am I doing this with the points cover and alternator cover off? And since the bike is on and revving, won't the stator be moving too fast for me to see it?

I'm assuming this whole procedure is in the manual?

Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #77 on: Jul 14, 2017, 09:32:07 »
If its in the advancer.  Most likely old sticky grease or worn springs.  If its the springs (stretched and loose fitting), sometimes you can cut a coil out and bend the next coil to fit.  Or just disassemble clean and re-grease.
Well I have inspected the advancer before when I replaced the seal behind it but it seemed in good condition and didn't seem stiff or worn

Offline crazypj

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #78 on: Jul 14, 2017, 12:53:47 »
I think your confusing a 'timing light' (12v bulb with some clips) and a 'timing light' (12v strobe connected to ignition left or right depending on which cylinder your checking)
 You need some way to have bike leaning to right or oil will run out when you remove generator cover (I put a piece of 1" thick wood under left leg of centre stand)
'Strobe' is connected to bike battery and 'thick lead' to spark plug.
The flash in sync with rotation allows you to see the timing marks on a running engine (same way a fluorescent tube can sometimes show spinning fan blades as stationary)
You use timing plate and points gap to get ignition timing 'spot on' and always check higher rpm by slowly opening throttle to see marks 'move' to full advance position.
Cheap timing light from Harbor Freight works as well as anything else out there, you don't need a 'professional' one (unless your going to start doing this 8 hrs a day?)
'you can take my word for it or argue until you find out I'm right'
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CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
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Online trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #79 on: Jul 14, 2017, 14:36:15 »
Actually the manual says very little about this procedure if memory serves.

A very important procedure, to make her run properly.