Author Topic: CJ360T Great find, a fun ride!...NOT SO MUCH:(  (Read 5301 times)

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Offline dawdish

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CJ360T Great find, a fun ride!...NOT SO MUCH:(
« on: July 29, 2012, 08:10:58 AM »
Hi all, I picked up this 360 about 6 months ago, it had been sitting, garaged for about 20 yrs, and it has about 7500 miles on it. The owner had put "stable"  in the gas, so though the gas was bad, the tank cleaned out easily and the carbs were, generally, ok.
I rode the bike for about 2 weeks in stock form with no problems, then just befor I started the build, it started running crappy. I thought well Ill take care of that during the build. But today, though a little better, it still runs like crap.
The symptom is...it fuel fouls #2 cyl...not wet with fuel, but black soot, and of course then the plug starts cutting out.
The bike idles perfect...and before the plug fouls, it runs down the highway like a bat out of hell.
But at tip in, just off idle to maybe 1/8-1/4 throttle, it spits and sputters. Open the throttle further, and it will go ahead and run, unless its in too high a gear, then it gets worse.
The #1 plug is a nice brown color and has never fouled.
The carbs have been off and apart and adjusted numerous times. All jets and adjustments are "exactly" the same.
The compression, here @ 6K feet elevation is 110# on both cyl., (kick starter only).
What I've done...I cked the ignition system...no power loss to the coils, the spark pattern scopes out perfect side for side... but just for grins, I switched the coils side to side, with no change in the fouling. Last time I had the carbs apart, I found the sliders had turned on the diaphragms, fixed that, and now after a 30 mile ride, though it still spits and sputters @ tip in, it hasnt "totally" fouled the plug, though it is still very black.
Mods...Pod filters, supper trap, and the obvious "Cafe" stuff.
HELP! It's got to be ready for a 250 mile trip in 2 weeks... And thanks much!
« Last Edit: July 29, 2012, 08:13:18 AM by dawdish »
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline CycleRanger

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #1 on: July 29, 2012, 08:23:00 AM »
I'm probably the only other person here with a CJ and your "before" picture is what I want my bike to look like!
Mines in pieces now slowly heading that way. I haven't gotten to the carbs yet.

However there's some other folks here who have CB360's so maybe they'll chime in.
Have you done a carb sync?

You might pop over to http://www.hondatwins.net/forum/ and see if anyone there has any tips.

Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline dawdish

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #2 on: July 29, 2012, 08:51:06 AM »
Hi Ranger, yea I've been over @ 'Twins, but no joy yet;(  Seems to me, and I may be wrong, but there seems to be "more" helpful "pros" on SOHC 4's.
Have fun with your build, when mines running "right" its a screamer!
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline CycleRanger

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #3 on: July 29, 2012, 09:55:20 AM »
Hi Ranger, yea I've been over @ 'Twins, but no joy yet;(  Seems to me, and I may be wrong, but there seems to be "more" helpful "pros" on SOHC 4's.
Have fun with your build, when mines running "right" its a screamer!
Thanks, yes, more good technical help here for sure! :)
Your bike looks like the one I wanted to find to restore..

So you've done a carb sync?
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline seanbarney41

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #4 on: July 29, 2012, 10:20:22 AM »
I'd look for a small, tear in the cv diaphragm...they can be easy to overlook.
If it works good, it looks good...

Offline dawdish

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #5 on: July 29, 2012, 12:51:02 PM »
@ ranger...No I havent done a sync;( just being lazy...the problem seemed to happen all at once...
@ seanbarney....I didnt see a tear, but like you say there easy to mis. But wouldnt that make it run lean? Or would you have to open the throttle more and it would overcompensate?
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline Steve_K

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #6 on: July 29, 2012, 01:19:21 PM »
seanbarney41 has a good suggestion.  The rubber is old.  Take it out and hold it to a strong light and look for tears and holes.  My GIXXER had cv carbs and my rubber parts were toast.  GIXXER parts were 100 buck each.  I got new flatslides.  Hope that maybe you have other issues.
Good luck
Steve
Steve_K

76 CB 550, 73CB750, 86 GSX-R750, 16 Slingshot
Old rides:305 Honda, CL350, 74 CB550
 05 SV1000S, 88 CBR600,92 VFR, 88 Hawk GT, 96 Ducati 900SS, 98 Kaw ZX6R, SV650

Offline seanbarney41

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #7 on: July 29, 2012, 05:12:34 PM »
@ ranger...No I havent done a sync;( just being lazy...the problem seemed to happen all at once...
@ seanbarney....I didnt see a tear, but like you say there easy to mis. But wouldnt that make it run lean? Or would you have to open the throttle more and it would overcompensate?
...don't really know what a bad diaphragm does to the fuel mix, I just know from experience that it will make the bike run bad...I had a '74 cb360t that got a ripped diaphragm, and don't really remember what it did to the plug, and yes, new slides are expensive...
If it works good, it looks good...

Offline jgmmgood

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #8 on: July 31, 2012, 11:58:50 AM »
Hey Dawdish....If you are interested, I can see what parts I have that might help you out.  I just got rid of a '76 360 and they probably have the same carb setup.  I know I have diaphragms and carb springs.  I can take pics if you like. 
Lookin' is for free, Touchin's gonna cost ya sumthin - Chaz Michael Michaels.

Offline dawdish

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #9 on: July 31, 2012, 05:27:19 PM »
@ jgmmgood....Thank you sure I'll look them over :)
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline dawdish

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #10 on: August 01, 2012, 11:26:34 AM »
Ok guys... After 80+/- miles since the last time I worked on the bike, here are pics of the plugs they are d8es.

Cked the compression this AM after the ride to work, both clydrs are 130#...perfect.

The bike is definitely running better...
« Last Edit: August 01, 2012, 11:29:06 AM by dawdish »
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline jgmmgood

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #11 on: August 02, 2012, 08:19:23 AM »
Dawdish,

See carb part pics.  Look OK to the eye.  I received them in 2007 from PO when I purchased the bike. 
Let me know if you're interested.  I have other parts for this 1976 360T as well.....Coils, brake shoes, jets (125 size), kickstart lever, points (used, but look good).  If you have a particular part you are having trouble finding, I can see if I have it.  I also have a 1975 350 that has many useable parts as well.

Lookin' is for free, Touchin's gonna cost ya sumthin - Chaz Michael Michaels.

Offline CycleRanger

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #12 on: August 02, 2012, 08:40:37 AM »
Dawdish,

See carb part pics.  Look OK to the eye.  I received them in 2007 from PO when I purchased the bike. 
Let me know if you're interested.  I have other parts for this 1976 360T as well.....Coils, brake shoes, jets (125 size), kickstart lever, points (used, but look good).  If you have a particular part you are having trouble finding, I can see if I have it.  I also have a 1975 350 that has many useable parts as well.

If he's not interested I might be. I'll be doing the carbs on my CJ this weekend.
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline jgmmgood

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #13 on: August 02, 2012, 08:49:51 AM »
You guys work it out and let me know.
Lookin' is for free, Touchin's gonna cost ya sumthin - Chaz Michael Michaels.

Offline dawdish

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #14 on: August 02, 2012, 07:39:53 PM »
@jgmmgood, what do you need for them ? the diaphrams and slides.
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline jgmmgood

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #15 on: August 03, 2012, 05:38:24 AM »
Dawdish,

I guess these things go for like $65 regularly.....How about $50 for the pair?  If that seems unreasonable, let me know....I am not trying to kill on price.  I will ship them to you for free.....Let me know. 
Lookin' is for free, Touchin's gonna cost ya sumthin - Chaz Michael Michaels.

Offline dawdish

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #16 on: August 03, 2012, 07:47:06 PM »
actually that sounds pretty good 50 for both...
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline jgmmgood

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #17 on: August 04, 2012, 12:51:30 PM »
Dawdish,

Sent u a PM
Lookin' is for free, Touchin's gonna cost ya sumthin - Chaz Michael Michaels.

Offline dawdish

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #18 on: August 10, 2012, 07:29:18 PM »
I know its been a while, but I finally got back to the 360 tonight. Took the diaphragms out and thoroughly inspected them for holes or tears, nothing. Cked all the air bleed passages for...well anything...nothing. So I decided to do a test and see if switching sides with the diaphragms would switch the fouling problem over to #1 cyl.

In this process I noticed that the springs for the slides were different lengths. #2 spring was 1.5 inches shorter than #1, what the heck! Not knowing how long there supposed to be, I stretched the short one to match. Put her back together, and rode her home. It's SO much smoother, the loading up seem to be gone!

My thought is the short spring was allowing the #2 slide to lift too high, too quickly, causing a too rich condition on that cyl.

Going for a longer ride tomorrow and I'll ck the plugs after.


Jim...I'll PM you...
'75 CB400F
'72 CB500 Four
1 CB550 Chappa (barn find)
1 '75 CB550 (barn find)
'81 Guzzi V1000( I couldn't help myself)

Offline cb650

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #19 on: August 10, 2012, 08:58:55 PM »
Cool.  I enjoy mine greatly.  its been over the divide several times.   Need to get down there and compair yours.
« Last Edit: August 11, 2012, 09:17:35 PM by cb650 »
18 grand and 18 miles dont make you a biker

Offline jgmmgood

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Re: CJ360T Great find, a fun ride!...NOT SO MUCH:(
« Reply #20 on: August 11, 2012, 04:02:19 PM »
Good deal Dawdish.  Glad you found the problem!
Lookin' is for free, Touchin's gonna cost ya sumthin - Chaz Michael Michaels.