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Author Topic: 75 CB360 - bad omen "yatagarasu" build  (Read 39965 times)


Offline crazypj

  • Posts: 13467
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #151 on: Mar 26, 2018, 10:47:56 »
Me too, sometimes put some 91 or 93 in but only if I know I'm going to be 'more stupid' than usual  chasing 900's (it gets 87 on the way home  ;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 MiniatureNinja

  • Posts: 522
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #152 on: Mar 26, 2018, 14:23:26 »
do you think with the oil transfer piece opened up a little, the center cam 'bearing' drilled for oil that I could reach 10-11k rpm intermittently without too much issue?

I know the points is a limiting factor... but I have a hard time going with pamco electrics on this bike I've heard they just arent reliable
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13467
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #153 on: Mar 26, 2018, 20:13:45 »
Points are designed to 'bounce' around 11~11,500 rpm, you can use an oil-stone to change points cam profile slightly so it will rev higher but I haven't bothered since around 1975 ish. The other thing people did was 'double spring' thhem using extra spring from old points set.
If it was a race motor it could be worthwhile swapping ignition system  but points ain't too much of a chore unless your riding every day when 1,500 miles comes around quite quick
The oil transfer piece mod is the best mod I've come up with for CB/CJ 250/360. Extra oil hole into journal is also a good idea if cam isn't 'gun drilled'. I consider myself personally responsible for the 'price hike' on 360's, If I hadn't figured out a way to make them more reliable they would still be cheap 'unreliable junk' prone to seizing cam bearings  ;D The cam bearing is really the only issue with t.he motor, generator output is low and reg/rect is 70's technology but both are easily fixed
I have never had a crank or transmission fail (even with the heavy Suzuki GS1000 pistons, 391cc and 10,000+rpm)
That bike even got me on TV as I was having so much fun (still got another 14.48  to go for my '15 minutes of fame'  ;D )
« Last Edit: Mar 26, 2018, 20:29:19 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: 522
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #154 on: Mar 26, 2018, 23:07:20 »
I've only ever seen one CB360 in person - and where I am there are a TON of vintage bikes (mostly BMW R series and triumphs, harleys) there is a vintage bike meet every month at the local taco joint... even last summer people loved my CB360 so many 'old' guys reminiscing about their trips up the coast back in the 70s with their own CB360. Few people recognize it unless they've owned one and when I'm done with it this spring I'll love to talk about all the little details that went into it. Maybe have to make a [ THNX PJ ] custom cali licence plate!
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13467
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #155 on: Mar 26, 2018, 23:48:23 »
Except for polishing one vacuum screw, carbs are done.
 Because the screws to mounting plate ha been loose I had to flatten the plate back with some 220 on surface plate. Did tops an carb bodies, they were actually pretty good compared to a lot I've done in the past. I polished mounting plate, it's kinda a 'trademark'  ;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 MiniatureNinja

  • Posts: 522
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #156 on: Mar 27, 2018, 12:36:17 »
looks awesome PJ! paypal incoming!

now I can't WAIT to get this thing back on the road

I ordered an .050 base gasket today
checking pisting ring gaps today

gotta finish drilling the clutch basket (holes drilled, just need to "smooth" them

also, tomorrow is fabrication day (welding wednesdays) so redoing the rear end. and then looking at possibly hiding the battery and electronics under the tank. I didn't do this before because no room with the coils, but since coils are gone I can make it work I think.
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13467
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #157 on: Mar 27, 2018, 13:53:52 »
Don't put battery under tank, it gets too hot and will 'kill' it.
Mount under front of swing arm behind engine, it's pretty well hidden plus you have various bit's there from centre stand to hang brackets off. You can also direct heat away from it to a certain extent and if it does catch fire you won't have a bomb
0.050" gasket will put you right where you need at 0.039" 'bump' This should be a quick motor even with stock cam (around 120 on a good day)
Almost forgot, I put 110 and 120 jets in a baggie, you have 115 fitted at present, may be a little rich, you'll need some plug chops to find out. Fuel screw is set at 1.5 turns out, will probably need  adjusting? Anywhere between 3/4 and 3 turns is 'normal', less than 1/2 turn needs smaller pilot (I modified the pilots to Kei-Hin spec, didn't touch the new ones so you have options if you like playing carburettors  ;D )
Be very very careful launching over 7k, it's so short and light things get very 'interesting'  ;) (at least to 50~60mph )
« Last Edit: Mar 27, 2018, 14:06:46 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: 522
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #158 on: Mar 27, 2018, 13:59:54 »
Don't put battery under tank, it gets too hot and will 'kill' it.
Mount under front of swing arm behind engine, it's pretty well hidden plus you have various bit's there from centre stand to hang brackets off. You can also direct heat away from it to a certain extent and if it does catch fire you won't have a bomb

well I planned to "shield" it and put heat reflective tape - the rear of the exhaust will be much closer to that area

but I already caught fire on this thing once... so I guess I'll just go back to my original idea and mount it under the seat
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13467
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #159 on: Mar 27, 2018, 14:09:49 »
I edited previous post.
Exhaust is way to short if it's exiting around swing arm pivot point, your not going to run open pipes (could be interesting with 125~130 secondary mains on a dyno to see just what it can do) I would guess around 41~42bhp at te wheel (compared to 36 at the crank that Honda claimed)
CB350's dyno around 26~28bhp, 360's 24~30 at the wheel (obviously more production variations on 360)
« Last Edit: Mar 27, 2018, 14:12:09 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