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Author Topic: 75 CB360 - bad omen "yatagarasu" build  (Read 22517 times)

Offline crazypj

  • Posts: 13118
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #410 on: Jul 20, 2018, 12:37:39 »
It may be better to just live with it until you get exhaust finalised as it's highly likely you'll have to do it again. Colortune is really only for idle mixture (and vehicle emission inspection), under load they heat up way too fast. If engine isn't under load it's almost certain to show a rich mixture
'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: 424
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #411 on: Jul 20, 2018, 14:05:37 »
Ah ok gotcha.

So I went for some more runs, dead spot seams to be more like 5k and only when light on throttle... if I give it all the throttle (and lean over the tank to keep the front end down) it pulls like an sr71
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13118
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #412 on: Jul 21, 2018, 14:29:15 »
LOL, Almost forgot, you need around 200miles/2 tanks gas before doing major carb tuning. Very few people believe just how quick a 378 is - until they ride one. My buddy Brendon has surprised a lot of people with $20,000+ bikes getting away from lights way quicker than anyone expected (me included a few times)
'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: 424
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #413 on: Jul 21, 2018, 14:56:50 »
Yea flat spot seams to be going away actually... this morning on the way to work it was just smooth all the way through. I'm gonna swap sprockets to the stock size 34t to see if it's the engine or the 35t sprocket that is trying to through me off the bike. Haha
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13118
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #414 on: Jul 21, 2018, 16:21:44 »
You could probably use a 33 or 32 and lower cruising rpm.I don't think you can go smaller than 32 as chain contacts hub? (maybe it's 30t, been almost 30 yrs since I checked ?)  I wouldn't even consider a 35 or larger with a 110 tyre, although I'm probably going to fit a 38 on 'Blue Bike' as it's got a 4.50 trail tyre on it  and is going to be used off road sometimes
'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: 424
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #415 on: Jul 28, 2018, 00:34:46 »
Got some more badass lightweight aluminum for the bike today, courtesy of speedy siegl racing. nearly finishing touches on the exhaust
'75 Honda CB360 - thread

Offline Sderbyshire

  • Posts: 221
  • Into Sailing, classic Triumph cars and motorbikes.
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #416 on: Jul 28, 2018, 05:21:44 »
Got some more badass lightweight aluminum for the bike today, courtesy of speedy siegl racing. nearly finishing touches on the exhaust

Those are nice.....

Offline MiniatureNinja

  • Posts: 424
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #417 on: Jul 31, 2018, 14:25:14 »
Well this sucks.

After  getting better and better the more I ride it, I barely made it home the other night.
Bike ran great high RPM or WOT, but coming off a light or anything below 3k it wanted to die. I got home pissing off every car alarm and business owner on my street. left spark plug was wet, almost like oil fouled. Right plug was coffee brown

Is this bike running too rich?
Changed plugs, bike starts and runs great then about 10 minutes later similar symptoms. I'm afraid to ride it home again I'm leaving it at a friends house until I can get it sorted
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13118
  • Split personality, I fake being smart
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #418 on: Jul 31, 2018, 15:12:55 »
It may be a little rich, you neerd it running right to check though. For it to get worse after 10 mins, it may be ignition heating up? If you have a timing light you could check spark isn't breaking down. Otherwise, check all carb jets are tight, maybe vibration loosened something off? Carbs are still level? If the rear 'sags' it raises fuel level causing rich mixture. How many miles on it now? Did you fit new points? They may have closed up. Did you check battery voltage? When it's low bike 'drops' a cylinder
'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: 424
Re: 75 CB360 - bad omen "yatagarasu" build
« Reply #419 on: Jul 31, 2018, 16:21:31 »
So things I checked:
Battery voltage (because I've had these problems before) its and antigravity lithium 4cell. 13.4 volts running at 13.6
Rick's high output stater and regulator for lithium batteries too, so that checked out

Ignition coils are nice and cool actually, being out in the wind must help, even sitting over the headers they are cool to the touch.

I took carbs off and checked all, float was set st 25mm, not sure what it was supposed to be, I left it alone. They are on there straight and the boots are in very good condition.

Nearly every other bolt had vibrated off, had to buy new ones and drill them for safety wire, bike vibrates a LOT I think more than it used to... not sure what's up with that. Feels like I'm sitting on a gravel packer.

Points are original for 1975... I should probably replace them, but they spring back and gap is good. I'll have to time it dynamically to see what's going on for sure. I just dont have a center stand yet and dont want oil pouring out the left cover
'75 Honda CB360 - thread