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Author Topic: CB 360 no label parts build!  (Read 3317 times)

Offline crazypj

  • Posts: 13155
  • Split personality, I fake being smart
Re: CB 360 no label parts build!
« Reply #30 on: Jun 03, 2018, 20:24:36 »
Rings not spaced at 120  won't cause oil burning. It's more likely second ring is in upside down plus they need bedding in which is why it's already less smoke than it was originally
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Stayrad

  • Posts: 57
CB 360 no label parts build!
« Reply #31 on: Jun 04, 2018, 02:20:02 »
Rings not spaced at 120  won't cause oil burning. It's more likely second ring is in upside down plus they need bedding in which is why it's already less smoke than it was originally

Cool, by end of day today all smoke was gone.

Now to tuning. Ugh!!!!! I hate this part. Feel like Iím running in circles.

So far....
Cam chain tension - check
Valves - check
Timing - perfect (Charlieís place ignition)
Plugs - new
Coils - good

The problem
Starts easy and idles perfect
Goes flat at 1/4 throttle or less

Thought it was jets so I tried every combination. Currently running 145 pilot and 160 main 2 turns out

Now Iím thinking itís the advancer
Springs are tight and pull back but maybe too tight.

The reason I think advancer is that I tightened the cam bolt that holds the advancer on. Slightly over finger tight and it ran horrible. I loosened it to confirm that the advancer could flex and it ran better but still canít get past quarter throttle.




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Offline crazypj

  • Posts: 13155
  • Split personality, I fake being smart
Re: CB 360 no label parts build!
« Reply #32 on: Jun 04, 2018, 12:23:01 »
Are you using Mikuni VM carbs?  It isn't possible to jet stock Kei-Hin to work with K&N or Uni's and cheap pods just restrict airflow over 6K
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Stayrad

  • Posts: 57
Re: CB 360 no label parts build!
« Reply #33 on: Jun 04, 2018, 21:45:56 »
Are you using Mikuni VM carbs?  It isn't possible to jet stock Kei-Hin to work with K&N or Uni's and cheap pods just restrict airflow over 6K
Ya they are vm30s


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Offline Stayrad

  • Posts: 57
Re: CB 360 no label parts build!
« Reply #34 on: Jun 04, 2018, 21:54:40 »
The pods are the ones sent with it from dime city. They donít look like they cover the holes. Also itís flat just revving it without the pods


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Offline MiniatureNinja

  • Posts: 454
Re: CB 360 no label parts build!
« Reply #35 on: Jun 04, 2018, 23:41:54 »
VM30s really are much too large for the CB360. that may not be your issue entirely but it's contributing
'75 Honda CB360 - thread

Offline Stayrad

  • Posts: 57
Re: CB 360 no label parts build!
« Reply #36 on: Jun 05, 2018, 00:41:10 »
VM30s really are much too large for the CB360. that may not be your issue entirely but it's contributing

So I messed with advancer tonight and it seems to be working  right. 

What is messing with my head is that it idles perfect. Starts up immediately and idles like a champ.

Just for fun I tried a 45 pilot and a 170 main and it did this weird thing where it would die when I took bike off kick stand and held upright. When tilted on kick stand it would idle.

 




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Offline Stayrad

  • Posts: 57
Re: CB 360 no label parts build!
« Reply #37 on: Jun 05, 2018, 00:49:38 »
I think tomorrow I will try points.


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Offline crazypj

  • Posts: 13155
  • Split personality, I fake being smart
Re: CB 360 no label parts build!
« Reply #38 on: Jun 05, 2018, 11:01:43 »
You need to go through carbs and check things like float levels, etc.
There is a ton of (mis-) information on VM30's. If you fit new plugs and just let it idle, they will be black within a minute or so, pilot is probably too big  Plugs are almost always 'dark' but shouldn't be sooty.. A major issue is the slide cut-away, it's too big in stock carbs so air speed drops as throttle is opened. Low airspeed means you don't get fuel drawn up emulsion tube and motor cuts out.
'Conventional' carb tuning doesn't really work when your pretty much starting from scratch (normally you fix main jet size then work backwards, fine for racing but not so great on the street where you need low/midrange~80% of the time)

'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Stayrad

  • Posts: 57
Re: CB 360 no label parts build!
« Reply #39 on: Jun 05, 2018, 19:02:39 »
Super helpful. Thank you I will try that. Would you say itís possible to get the vm30s tuned for regular street riding?