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Author Topic: 1974 CB360 Engine Troubles (I think)  (Read 3951 times)

Offline rsjudka

  • Posts: 53
Re: 1974 CB360 Engine Troubles (I think)
« Reply #100 on: Jul 23, 2017, 19:40:35 »
You now need to vacuum sync carbs and run it for at least 200 miles.

So I followed this video when syncing my carbs Is this not vacuum syncing the carbs?

And I'll definitely be riding now that she works! Just gotta wait for the rain to pass  >:( Thanks for the tip on checking the oil level, I'll be keeping a close eye on that.

See you all in 200 miles  8)
« Last Edit: Jul 24, 2017, 10:51:48 by rsjudka »

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #101 on: Jul 24, 2017, 20:49:06 »
You got it.  8)  Now you can dial in Air/Fuel mix adjustment to its happy place. 

Offline rsjudka

  • Posts: 53
Re: 1974 CB360 Engine Troubles (I think)
« Reply #102 on: Aug 05, 2017, 15:29:49 »
Back with an update! (Not a good one unfortunately )

One day while I was starting my bike up I heard something like air seeping through the right carb, so I decided to take it off and check to diaphragm, which has a few tears in it )

Since this is just in the carb, the only thing I would need to redo is the carb sync right? Now it's just time to wait for the diagpgram to come in

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #103 on: Aug 05, 2017, 23:20:52 »
Stink!  a torn diaphragm shouldnt effect sync.  But its an easy thing to check. 

Where is the new diaphragm coming from?

Also, its best to run pure gas, as ethanol is a powerful solvent it will dry diaphragms and o-rings.

You can find a source here.
https://www.pure-gas.org
« Last Edit: Aug 05, 2017, 23:28:08 by trek97 »

Offline rsjudka

  • Posts: 53
Re: 1974 CB360 Engine Troubles (I think)
« Reply #104 on: Aug 06, 2017, 03:45:12 »
The diaphragm was super hard to find, the only place I could find one (aftermarket) was from CMC.

And dang the closest gas station is about 50 miles in ever direction (living in Chicago) :(

What issue would a torn diaphragm cause then?

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #105 on: Aug 06, 2017, 06:46:50 »
When the diaphragm is torn, the slide wont rise.  So, she will go lean in higher rpms.  Wont effect idle or lower rpm running at all.
for pure gas Im in the same boat.  Down here in Champaign Illinois. (3 hours south of you)
Its about a 1.5 hour round trip for me to get pure gas.  So I buy 10-15 gallons at a time.   >:(
Which reminds me its time for me to make the run.

Some guys claim to have good luck w aftermarket, I tried the JBM diaphragms once.  They went directly into the trash can. $40 for the pair wasted.  My 360 wasnt ridable with them.  http://jbmindustries.com/Keihin_diaphragm.html
They were too soft and would allow the slides to rise to quickly.  Making her run crazy rich around 2500 rpm.

I picked up new OEM Honda slides w diaphragms and springs.  (Kit #7 at local Honda dealer).  Runs like a champ now.  8)
I couldnt be happier w them. http://shop.sportlandmotorsports.com/OEMpartfinder.htm#/Honda/CB360TA_(76)_MOTORCYCLE,_JPN,_VIN%23_CB360-2200001/CARBURETOR/CB360T-76-JPN-A/2Y133871AE13387116A
« Last Edit: Aug 06, 2017, 06:52:41 by trek97 »

Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #106 on: Aug 06, 2017, 13:19:06 »


Down here in Champaign Illinois. (3 hours south of you)
Try a 1.5 hour drive 😏 (I drive down there alot to visit my gf at uofi)

Well hopefully the diaphragm I bought will work out, don't feel like spending $100 for the OEM one lol

So could that have been causing the smoke from the one side at higher rpms?

Offline trek97

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #107 on: Aug 06, 2017, 17:52:27 »
Heck we will have to get together sometime.  I work in the University Elevator shop.
Its about 3 hours from my house to O'hare.  I dont exactly live in Champaign but close enough.

I think maybe yes, ( Although, I dont recall mine smoking when it tore a diaphragm) its possible to think a torn diaphragm could cause some smoke at higher rpm.
Since she couldnt draw enough air through the carb. (slide being down)  She may have been sucking air from someplace oily.
Vacuum is a very powerful thing.

Yeah, I noticed the price.   :o  They have gone up substantially since I bought mine.  thinking I paid $140 for pair.
Fingers crossed.  Hopefully the CMC diaphragm is just the ticket for you.  :)
« Last Edit: Aug 06, 2017, 18:09:12 by trek97 »

Offline rsjudka

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Re: 1974 CB360 Engine Troubles (I think)
« Reply #108 on: Aug 06, 2017, 20:42:15 »
Heck we will have to get together sometime.  I work in the University Elevator shop.
Its about 3 hours from my house to O'hare.  I dont exactly live in Champaign but close enough.

That would be cool! Especially since you're the one why pretty fixed my bike up  ;D
And yeah normally its about a 2-3 hour drive down there, but with the right speed and an open road its easy to cut that time in half  8)

So most of what I've been seeing is that smoke is caused by bad rings/valves, but I've consistently been getting ~160 on my compression tests. Could you have good compression and still have bad rings/valves?

Offline rsjudka

  • Posts: 53
Re: 1974 CB360 Engine Troubles (I think)
« Reply #109 on: Aug 10, 2017, 18:48:08 »
So this is kind of unrelated, but one of my blinker bulbs went out so I ordered some led ones (i recently upgraded the ones in my gauges to led too) but the leds I bought dont work. They were amber colored BA15S http://www.ebay.com/itm/2pcs-BA15S-1156-24-LED-Yellow-Amber-Car-Bulb-1156-ba15s-Turn-Signal-Light/311920166763?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 and I tested the bulbs themselves and they work fine. I read that leds should work just fine.