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Author Topic: '74 CB383 (CB360) - a Mighty Mouse adventure bike  (Read 19346 times)

Offline Mydlyfkryzis

  • Posts: 3062
  • 当有疑问时踢你的敌人在生殖器上,你可以道歉后
    • CB360 Build
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #30 on: Feb 25, 2013, 10:44:53 »
Properly functioning valves rotated slightly with every activation.  I have never heard of a leaning valve.

I would say the valves are bent, if your description is accurate.
There are 10 kinds of people, those who know binary and those who don't
Ignorance is bliss....and there are a lot of happy people out there!
AlphaDogChoppers: "A friend of mine once said, "There's no such thing as a stupid question, but there sure are a lot of inquisitive idiots."
"if you need a hammer to do something...  you are probably doing it wrong" - LazloH

DTT Blue CB360 Club - We discriminate!
Mydlyfkryzis = Mid Life Crisis
------------------------------------------
1991 Honda Nighthawk 750
1976 Honda CB360t
http://www.dotheton.com/forum/index.php?topic=41649.new#new

Offline crazypj

  • Posts: 12629
  • Split personality, I fake being smart
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #31 on: Feb 25, 2013, 11:01:32 »
If you have a gap to seat when rotated, valves are bent and you need new ones.
You did clean up the steps in exhaust port 'bowl'?
 you can take out some more material in the 3:00~9:00 positions (ref pic)
 You also need to check guide wear/damage
Get down the sides of guide boss as well, the exhaust is the main restriction on 360 (btw, how are you getting a 383?)
'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 Finnigan

  • Posts: 1945
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #32 on: Feb 25, 2013, 13:34:14 »
Not really sure it would help but I can send you my spare set of 360 valves for you to reference.  If you end up needing them you can throw me a couple bucks (they need to be cleaned off though)

Offline Treesus

  • Posts: 69
  • Probably not sane.
    • Half Day Around
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #33 on: Feb 25, 2013, 13:54:52 »
Played with them a bit more this morning. Definitely have a slight bend to them. Will need to check the guides more thoroughly after my FAA medical appointment.

Damn. Can anyone recommend a source for good valves and guides?
I see a few on ebay. Looks like 350 valves will work in a 360?

Finnigan- Thanks. I will keep you in mind. Do you need them or not mind parting with them?

PJ - I will go back and take out a bit more. I cleaned up the combustion chamber side all around the valves and plugs, as well as behind the valves (bowl?) so I don't think that is an issue with the seating. 383 is from 69.5mm pistons. (+.5 GS850).

~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: 1945
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #34 on: Feb 25, 2013, 14:00:49 »
I JUST bought some valve guides from ebay

http://www.ebay.com/itm/HONDA-CB350-CL350-SL350-CB360-BRONZE-VALVE-GUIDES-WITH-VITON-SEALS-/230927566181?pt=Motorcycles_Parts_Accessories&hash=item35c45b0565&vxp=mtr

but you need to buy the special driver and then buy a reamer to kind of bore them out (they mushroom inside after getting driven in)

I pulled these valves off a spare head and don't need them.

If you need the valves and buy the guides I'll send you the driver and you can mail it back when you're done
« Last Edit: Feb 25, 2013, 14:02:20 by Finnigan »

Offline crazypj

  • Posts: 12629
  • Split personality, I fake being smart
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #35 on: Feb 25, 2013, 18:10:26 »
Ah-ha, thought it was a 69.5 but wanted verification ;D
I wouldn't have bought guides until you know you need them, they are quite spendy, particularly when you need driver and reamer
I would get a reamer from China, takes a couple of weeks but it's massively cheaper than Honda one from Japan
 As for driver, any local machine shop could turn a pilot on a piece of bar, it doesn't need to be hardened if your only doing 4 guides
350 and 360 valves are the same, one of the few parts that swaps over
'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 #36 on: Feb 25, 2013, 18:38:25 »
I found a pair of unused 69.5mm pistons with rings and pins as a set for a price I just couldn't pass up  ;D  Also, I was (at the time) having a hard time finding rings for the 69mm pistons I bought.



I was just playing with the guides in a pretty unscientific way. I don't have any means to actually measure them.
So, I just slid them in to feel for any wiggle. Intake sides don't seem to have any movement other than the proper in and out.

Exhaust valves are able to move very slightly around... enough to say to me that they do need replacement. I guess that means I might as well do all four and go bronze? (Finnigan)
Haven't purchased anything quite yet. I was originally planning on leaving all that alone for no. Projects do what they want, not what you have planned though.

Anyone used Stainless valves? Is there any advantage to carbon build up, longevity, weight or performance over stock?
~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: 12629
  • Split personality, I fake being smart
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #37 on: Feb 25, 2013, 18:47:57 »
No advantage unless you go 1mm oversize  ;)
 I still can't justify the $200+ it's going to cost me though (which is why I'm running stock ones  ;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 #38 on: Feb 25, 2013, 18:55:16 »
1mm oversize on just the exhaust or both?

They guy who sells the seals also offers valves. Says he'll do oversize for the same price...
~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: 1945
Re: '74 CB383 (CB360) - a Mighty Mouse adventure bike
« Reply #39 on: Feb 25, 2013, 18:55:56 »
Haha I have .75 oversized rings if you want them, BRAND NEW