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Author Topic: 75 CB360 - bad omen "yatagarasu" build  (Read 22591 times)

Offline MiniatureNinja

  • Posts: 427
75 CB360 - bad omen "yatagarasu" build
« on: Jan 15, 2018, 18:54:11 »
OK here we go. I bought this bike in February last year from the second owner, who in an attempt to rekindle his youth decided to "cafe" the bike and had a younger friend 'help' him do so. It was quite a mess, I don't know why he chose to chop up an otherwise perfectly good bike.

I never intended to document anything or make a thread so I didn't take many pictures of anything but we are starting over this winter making this thing proper so you guys get yet another cb360 thread (thanks PJ)

the bike ran well, even with velocity stacks and no exhaust (and I mean no exhaust, the guy cut all but the first 9 inches of bend off the pipes and left it, I dunno what he was going for.
the first thing I did was put exhaust on it. the electrics were whack, but the bike ran and rode well, i rode it all summer only ever catching on fire once.

so here we are now!
before I rode it I did some things, I changed fork fluid, changed oil, PO said it was recently "maintained" whatever that meant. Tires on the bike are shit Chen Shen or something. Gonna have to fix that. Everything else is as follows. FOLLOW ALONG!



yes, this is where I am right now. in my back garden, with nothing but a tarp for protection and some less than stable work surfaces! But hey, its fun. friends are helping with welding and the larger machining tasks.



this is what the under seat looked like after it caught fire (charging system not up to snuff, not my wiring!)



new rick's kit - should fix that





chopping down the rear (will add hoop here as soon as I get new tuffside seat in so that it can match well)



comparing clubmans and clip ons. these clipons are trash, I ordered better ones




drilled some holes. may drill more to clean the rest of the rotor these holes will just leave grooves I fear



engine out



new valves are in order. debating the extra $50 each for 1mm larger intakes


rest of the engine is in remarkably excellent shape. pensioners are the OLD style, and look very worn. will replace.
I am planning to bore the engine out using tried and true methods of the GS850 pistons, which I already have in hand, with rings and new hardware. copper gasket, some mild porting to clean things up. stay tuned, Lots more to come. Now that I know I need to make a thread, I will do better with pictures
« Last Edit: Apr 11, 2018, 14:52:37 by MiniatureNinja »
'75 Honda CB360 - thread

Online irk miller

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #1 on: Jan 15, 2018, 19:16:42 »
Awesome.  The ebbs and flows of CB360 threads on DTT.  It's nice to have another upswing. 

Offline MiniatureNinja

  • Posts: 427
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #2 on: Jan 16, 2018, 15:55:52 »


Found some new old stock gs850 pistons. Gonna be punching the cylinders out (well having it done locally)
« Last Edit: Jan 16, 2018, 16:36:37 by MiniatureNinja »
'75 Honda CB360 - thread


Offline WhyNot

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #4 on: Jan 16, 2018, 16:26:19 »
Interesting build.

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

2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline MiniatureNinja

  • Posts: 427
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #5 on: Jan 16, 2018, 16:29:00 »
Interesting build.

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

the 350 i believe uses a 15mm wrist pin, where the cb360 and gs850 both use a ~16mm diameter wrist pin.

so short answer is - anything can be done with enough money
long answer is - it's gonna take a lot of money to do that
'75 Honda CB360 - thread

Offline WhyNot

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #6 on: Jan 16, 2018, 16:30:03 »
the 350 i believe uses a 15mm wrist pin, where the cb360 and gs850 both use a ~16mm diameter wrist pin.

so short answer is - anything can be done with enough money
long answer is - it's gonna take a lot of money to do that

lol....thanks
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Online Sonreir

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #7 on: Jan 16, 2018, 18:17:36 »
Following along.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline advCo

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #8 on: Jan 16, 2018, 18:33:55 »
Definitely drill out the rest of the rotor, it will squeal like a piggy and gouge the pads if you run it like that. Ask me how I know  ;D
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline crazypj

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Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #9 on: Jan 16, 2018, 19:40:13 »
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.
Cheng Shin made in last 5~6 yrs are OK  particularly at the price point and far superior to some of the overpriced crap out there (the price of one nice square Firestone will probably get you 3 Cheng Shin OK tyres)
« Last Edit: Jan 16, 2018, 20:03:27 by crazypj »
'you can take my word for it or argue until you find out I'm right'
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"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