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Author Topic: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)  (Read 350852 times)

Offline MrMister

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #880 on: Mar 07, 2016, 01:32:51 »
From your experience, do you think cb360's work better with 2 into 1, or keeping them 2-2?

Offline crazypj

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #881 on: Mar 08, 2016, 14:01:58 »
Because of the 180 degree crank they should work better with a 2:2 but I haven't found a lot of difference.
On the street it doesn't really matter much which you use but if I was building a 'race' motor I would probably go with a 2:2
'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 ridesolo

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #882 on: Apr 15, 2016, 23:31:26 »
I'm about to order a copper head gasket from Lani for my 378.  Is 1.06mm thick and the bores cut to 69.5mm is right?  Thanx! 
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

This is cooking away out in the shop:
'75 Honda CL378: http://www.dotheton.com/forum/index.php?topic=56547.0

This is an on-going Non-Motorcycle saga:  http://www.dotheton.com/forum/index.php?topic=71319.0

This one is FINALLY done: (!)
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline crazypj

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #883 on: Apr 16, 2016, 12:33:22 »
1.06 is same as stock thickness. Bores at 69.5 give 0.25mm clearance at top of cylinder. 69mm will 'move' into combustion chamber when hot and can contact piston crown
'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 ridesolo

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #884 on: Apr 16, 2016, 17:02:43 »
1.06 is same as stock thickness. Bores at 69.5 give 0.25mm clearance at top of cylinder. 69mm will 'move' into combustion chamber when hot and can contact piston crown 

Excellent!  1.06mm & 69.5mm is what I'll order then, thanx! 
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

This is cooking away out in the shop:
'75 Honda CL378: http://www.dotheton.com/forum/index.php?topic=56547.0

This is an on-going Non-Motorcycle saga:  http://www.dotheton.com/forum/index.php?topic=71319.0

This one is FINALLY done: (!)
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline crazypj

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #885 on: Apr 17, 2016, 17:48:06 »
You need to check piston to valve clearances with some clay (plasticene on top of piston)
There were production variations over the years and some GS piston combo's get a little close to head/valves
It's the reason I don't recommend skimming 0.020" off head and/or block any longer.
Honda probably bumped the compression slightly but didn't tell anyone? (sounds reasonable to me  ;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 ridesolo

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #886 on: Apr 17, 2016, 22:08:49 »
You need to check piston to valve clearances with some clay (plasticene on top of piston)
There were production variations over the years and some GS piston combo's get a little close to head/valves
It's the reason I don't recommend skimming 0.020" off head and/or block any longer.
Honda probably bumped the compression slightly but didn't tell anyone? (sounds reasonable to me  ;D

Understood, thanx!  I figure the thing is going to be more healthy, that's the idea, right?  However when it's all said and done it's still a 40+ year old less than half-liter bike that will never be a 'Busa or anything close so why try and take the specs out to the edge to gain a half horse or a few extra RPMs.  I hope to make it run and run well, but don't intend to get obsessed with trying to squeeze out every last bit of possible gain.    8)   
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

This is cooking away out in the shop:
'75 Honda CL378: http://www.dotheton.com/forum/index.php?topic=56547.0

This is an on-going Non-Motorcycle saga:  http://www.dotheton.com/forum/index.php?topic=71319.0

This one is FINALLY done: (!)
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline crazypj

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  • Split personality, I fake being smart
Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #887 on: Apr 18, 2016, 12:49:31 »
One thing that will 'scare' other bigger bike owners, just how damn quick it can get off the line and to around ~60mph without appearing to be revving stupid high. Launch around 5~6K and rev it to normal red-line
Unless your with a group who know what they are doing, you won't have much if any problem  on 80~90mph roads  8)
'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 Sonreir

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Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #888 on: Apr 18, 2016, 12:50:47 »
You need to check piston to valve clearances with some clay (plasticene on top of piston)
There were production variations over the years and some GS piston combo's get a little close to head/valves
It's the reason I don't recommend skimming 0.020" off head and/or block any longer.
Honda probably bumped the compression slightly but didn't tell anyone? (sounds reasonable to me  ;D )

+1

I swapped over to GS850 pistons with .040" skimmed and had clearance issues.
Sparck Moto - http://www.sparckmoto.com

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1976 Puch Maxi - APuchalypse Now
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Offline crazypj

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  • Split personality, I fake being smart
Re: CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)
« Reply #889 on: Apr 21, 2016, 11:08:58 »
Been screwing around with Jeep Liberty transmission last few (months?)
42RLE is a weak point on them but Liberty owners groups get real upset when you mention how fucked up they get.
All the planetary gears are totally trashed but all the clutch friction and steel plates just about perfect
I think son-in - law or stepdaughter did a 'bootleg turn from reverse to forward and broke it but everyone is saying they were ' just driving along'
Does anyone know of any modifications other than enlarging hole in valve plate and modifying one of the shuttle valves?(without spending any more money)
Surprised the parts were not totally outrageous, around $700.00 with shipping (modified trans around $6,000, re-build, ~$1,600 minimum)
Here's some pics of carnage





sorry that one is so blurry, trying to get pic of the 'removed' gear teeth  ;)
This is service manual pic of the parts
« Last Edit: Apr 21, 2016, 11:11:31 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