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Author Topic: '74 CB383 (CB360) - a Mighty Mouse adventure bike  (Read 22941 times)

Offline Treesus

  • Posts: 69
  • Probably not sane.
    • Half Day Around
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #40 on: Feb 25, 2013, 19:00:55 »
Haha I have .75 oversized rings if you want them, BRAND NEW

Valves or piston rings? My pistons are installed. 2.5mm oversized  ;)
~Tree

CB360 Adventure build http://www.dotheton.com/forum/index.php?topic=43834.20

"I think it says in the Bible that there is a time to listen to techno, and a time not to." -Joe Strummer

Offline Finnigan

  • Posts: 1954
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #41 on: Feb 25, 2013, 19:49:55 »
oh haha i meant piston rings

It's crazy how much your thread is coinciding with my build, I just got my reamer delivered to me today (7mm high speed steel spiral flute style...i think) I'll try it out tonight on my new valve guides and see how it all works with standard valves
« Last Edit: Feb 25, 2013, 19:53:08 by Finnigan »

Offline crazypj

  • Posts: 13221
  • Split personality, I fake being smart
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #42 on: Feb 25, 2013, 20:46:59 »
Actually, you only need 1mm OS intakes if your doing 1mm OS exhaust.
As the exhaust is the major restriction on 360, maybe 1mm OS would wake it up a bit more?
'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 Treesus

  • Posts: 69
  • Probably not sane.
    • Half Day Around
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #43 on: Feb 26, 2013, 16:48:24 »
I emailed a guy in CA selling valve guides and making valves. He sells the guides with viton seals (which I already bought before I knew the valves were bad). He agreed to cut me a good deal combining the guides and valves with no seals.

Also, I can't find a single instance (on the net) of someone putting in 1mm oversized intake/exhaust valves on a CB360. I know someone, somewhere has to have done it, but its not been posted so far as I can tell. Anyone have a link or seen it up?

This lack of information sweetens the notion of trying it out. And then sharing the results. I may have to put this bike on a dyno when I get it tuned up. You are a (bad) influence, PJ.  :P

As far as I can tell, new seats aren't required. (any contradictions on that?) I just need to have them machined. Already talked to a local guy interesting in doing that.

~Tree

CB360 Adventure build http://www.dotheton.com/forum/index.php?topic=43834.20

"I think it says in the Bible that there is a time to listen to techno, and a time not to." -Joe Strummer

Offline Treesus

  • Posts: 69
  • Probably not sane.
    • Half Day Around
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #44 on: Feb 26, 2013, 17:08:03 »
Also, can anyone recommend a good source for a full set of different jet sizes at a decent price?
I remembered, again, that since I moved from 5,000ft elevation to sea-level in addition to the engine rebuild I will need to start from jetting scratch.
Might as well just get a full set so I can play with them without having to order a bunch in sequence.
~Tree

CB360 Adventure build http://www.dotheton.com/forum/index.php?topic=43834.20

"I think it says in the Bible that there is a time to listen to techno, and a time not to." -Joe Strummer

Offline crazypj

  • Posts: 13221
  • Split personality, I fake being smart
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #45 on: Feb 27, 2013, 03:20:11 »
Stock jetting will probably be close @5,000ft
 Brendon is now up to 125 secondary mains, but, we are at sea level (although it rained so much today it felt like we were below it  ;D )
 Sonrier fitted OS valves in his 378

http://www.dotheton.com/forum/index.php?topic=19672.475
« Last Edit: Feb 27, 2013, 03:30:02 by crazypj »
'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 Treesus

  • Posts: 69
  • Probably not sane.
    • Half Day Around
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #46 on: Feb 27, 2013, 07:32:41 »
Not too much rain here in Anchorage. Plenty of snow, though it got nice and warm today. I think a high of 37*f  :o

Tinkered around with a few items today since I can't finish the head. Put new bearings in the wheels. Took off my old rear sprocket and replaced it with a new one. The new swingarm requires a longer chain, so both sprockets are getting swapped.

I was running stock front and a 35T rear. New rear is back to the stock 34T. For the front I got a 17T and an 18T just to play with and see if it is too tame, or if it works well on the highway.

Anyhow, if you've ever wondered what the difference in diameter one tooth makes between the 34T and 35T at this size, its about 10mm



Spent a good couple of hours slowly opening up the exhaust ports and trying to get them roughly the same. I took more out of the sides, and shaved a lot of the excess off the guide protrusion, then quite a bit off the bottom curve opposite the guides (shortest pathway for the exhaust gases to take). Ran out of grinder stone bits so the one still needs to be cleaned up a wee bit.




Also took a fair amount out just behind the valve seat, but couldn't get a good angle for a photo.

Any feedback?

I've never ported a head before.

~Tree

CB360 Adventure build http://www.dotheton.com/forum/index.php?topic=43834.20

"I think it says in the Bible that there is a time to listen to techno, and a time not to." -Joe Strummer

Offline crazypj

  • Posts: 13221
  • Split personality, I fake being smart
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #47 on: Feb 27, 2013, 14:23:28 »
You should have left most of the bottom of port in position and made it more 'D' shape (next time  ;D )
Opening up all the way around won't harm high rpm but you loose a little mid range (not that you had much to start with  ;D )
'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 Treesus

  • Posts: 69
  • Probably not sane.
    • Half Day Around
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #48 on: Feb 27, 2013, 16:08:27 »
Ah! Thanks, PJ. Always trying to learn.

I was focusing on the sides at first but with the header studs in the way I was having a hard time getting as much material off as I wanted. I guess I got a little impatient and just went all the way around. Doh! (Homer Simpson voice with a palm to the forehead)

Hopefully with all said and done, it will still be a bit "better," if not ideal.

I am realizing sadly that today is my last day to tinker for a while. Back to work tomorrow until March 15, then off to HI for a week long photo job (other work, I guess), then to Utah for a friend's wedding. Hopefully back in Anchoragua by March 25. Damn. Nearly a straight month of motorcycle abstinence. CHEAP.
~Tree

CB360 Adventure build http://www.dotheton.com/forum/index.php?topic=43834.20

"I think it says in the Bible that there is a time to listen to techno, and a time not to." -Joe Strummer

Offline 3DogNate

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Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #49 on: Feb 27, 2013, 16:21:22 »
Just found this thread for the first time.... VERY cool