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Author Topic: 75 CB360 - bad omen "yatagarasu" build  (Read 24367 times)

Offline MiniatureNinja

  • Posts: 457
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #10 on: Jan 16, 2018, 20:00:42 »
The extra 22cc is best bang for the buck ever.
Oversize intake valves are a good idea but not 100% necessary, all my engines so far are running stock valves.

the valves im only debating because "while it's apart" still up in the air - gaming computer components are stupid expensive right now so i have decided to put that stuff on hold, opening up the bike budget some - carburetors is what I am really worried about tackling probably gonna pick up a jet kit from common-motor.com bike had symptoms of running lean and i imagine that the larger displacement, porting, and exhaust that i plan on making will require more fuel

one question: do I have to split the case? it's never been open before, bike had pretty low miles on it and shifted flawlessly. I'm wondering the pros and cons to splitting the case
'75 Honda CB360 - thread

Offline irk miller

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #11 on: Jan 16, 2018, 20:07:53 »
Don't split the cases unless you know the transmission and/or crank are a mess.

Online crazypj

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #12 on: Jan 16, 2018, 20:12:32 »
No need to open case unless you really want to have a look inside or kickstart return spring breaks. All the 'important' stuff you need to do can be done with just the covers off.
 If you want to run K&N wit stock carbs they cannot be  just jetted but need extra stuff done to them (and for road use modified stock are almost always superior to Mikuni VM) The only thing that as to be changed is secondary main jet and that is totally dependent on the exhaust system more than extra 11cc per cylinder. the extra 'vacuum' is self compensating with stock carbs. Trek is using smaller than stock primary mains (65?) with stock bore and I'm pretty sure he won't need to change  back to originals  (68) with the 378 he's doing
 I've never seen a broken transmission in a 360, it's designed for more power tan bike can ever make (unless you get into full turbo/supercharger, nitrous, etc) Same goes for crank although parking bike in a lake for a few months would probably screw the bearings pretty good. Small ends can get scuffed if left idling but even that takes a long time plus dirty oil
« Last Edit: Jan 16, 2018, 20:17:26 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

Online crazypj

  • Posts: 13157
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #13 on: Jan 16, 2018, 20:22:20 »
Interesting build.

I don't suppose you can do this same trick to a CB350 twin can you?

You sorta can but it's more work. I think GS 550 pistons work or it may have been Kawasaki 650? (been a long time since I did one)
It's a little more expensive but easier to get a Todd Henning kit for 350 although I can't remember if CR is a bit higher than you want for road gas?
Biggest issue with 350 compared to 360 is the offset stud spacing so you have to bore block offset to get major capacity increase plus you then ave to use same offset on crankcase top. 360 will got to a 70mm bore but 350, never going to happen unless you weld all the stud holes then make a new block and head
« Last Edit: Jan 16, 2018, 20:33:17 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 MiniatureNinja

  • Posts: 457
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #14 on: Jan 16, 2018, 20:37:42 »
No need to open case unless you really want to have a look inside or kickstart return spring breaks. All the 'important' stuff you need to do can be done with just the covers off.
 If you want to run K&N wit stock carbs they cannot be  just jetted but need extra stuff done to them (and for road use modified stock are almost always superior to Mikuni VM) The only thing that as to be changed is secondary main jet and that is totally dependent on the exhaust system more than extra 11cc per cylinder. the extra 'vacuum' is self compensating with stock carbs. Trek is using smaller than stock primary mains (65?) with stock bore and I'm pretty sure he won't need to change  back to originals  (68) with the 378 he's doing
 I've never seen a broken transmission in a 360, it's designed for more power tan bike can ever make (unless you get into full turbo/supercharger, nitrous, etc) Same goes for crank although parking bike in a lake for a few months would probably screw the bearings pretty good. Small ends can get scuffed if left idling but even that takes a long time plus dirty oil

thanks man. you still doing carb stuff?
'75 Honda CB360 - thread

Online crazypj

  • Posts: 13157
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #15 on: Jan 16, 2018, 20:41:41 »
Yep but I'm really slow 6weeks to 3 monts turn around(too much other stuff going on plus (gasp) I'm getting older
You need to drill the 'extra' holes in rotor so they 'overlap' slightly, that way pads stay flat and rotor stays 'clean'
'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 MiniatureNinja

  • Posts: 457
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #16 on: Jan 16, 2018, 20:41:56 »


Will need to find a new way to mount the tank, this all has to come out to do what I want with the seat
'75 Honda CB360 - thread

Online crazypj

  • Posts: 13157
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #17 on: Jan 16, 2018, 20:53:23 »
Use a Yamaha rear mount and drill a hole for bolt/washer combo (or weld a tube/nut to frame) or weld  CB piece to frame with original rubber mount. I don't remember how I did last one of mine when I swapped tanks
« Last Edit: Jan 16, 2018, 20:55:04 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 MiniatureNinja

  • Posts: 457
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #18 on: Jan 16, 2018, 21:30:02 »
I was thinking actually stock front bumpers and Velcro,  or old school tank strap
'75 Honda CB360 - thread

Online crazypj

  • Posts: 13157
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #19 on: Jan 16, 2018, 21:42:18 »
Velcro  won't hold it if you hit a decent pothole plus tank can move around if your 'using' it when cornering. Even stock mounts are marginal when your 'leaning on it' a bit ;)
'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