75 CB360 - bad omen "yatagarasu" build

MiniatureNinja

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CJ360 swingarm is slightly longer (by about an inch) than the CB, and I really liked the look of the CJ brake pedal.



yea lets drill holes in it
 

crazypj

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MiniatureNinja said:
CJ360 swingarm is slightly longer (by about an inch) than the CB, and I really liked the look of the CJ brake pedal.
I got hold of an XR200 'Pro Link' swing arm (about 4" longer) plus CJ brake pedal for 'Blue Bike'
Just need to get my arse in gear and get some work done on it again
 

MiniatureNinja

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crazypj said:
I got hold of an XR200 'Pro Link' swing arm (about 4" longer) plus CJ brake pedal for 'Blue Bike'
Just need to get my arse in gear and get some work done on it again
I debated chopping and going 3 inches longer, I really want to retain the original appearance of the bike just make it low and mean. I suppose aluminum swingarm is nice and light, just looks out of place to me
 

MiniatureNinja

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side by side, stock cb360 vs GS850

Wonder if I will have to do anything to combustion camber in head to make these work properly
 

MiniatureNinja

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irk miller said:
Even with the flat part around the piston? Does that effect flow or combustion?
I'm thinking it will work for sure yes, seeing the larger number of people that have used these pistons but optimally... I guess modifying the piston is easier. Is there a compression change with the more dome shape?

Also just realized I have to use the gs piston pins, even thought I bought new cb ones, because they are about 1mm shorter and the clips won't work with the cb pins
 

crazypj

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Don't touch pistons or head, you set clearances with different thickness gaskets. CR comes up a bit due to size of overbore.
If you run 0.040" piston to head you can still use 87 Octane without problems Although I try to get 0.037"~0.038" and 2:1 - 87/93 when I can't get 91 octane. Bit nervous first time I tried it but couln't feel any difference even running a couple of tans 87
XR swing arm is silver painted steel, alloy would be nice but stock XR is direct fitand much easier to weld mounts for twin shock. I would have gotten an earlier twin shock one or XL but XR was easier to find
 

irk miller

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I used the XL250 swingarm on my second 360. It was a super easy swap to dual shocks. And like PJ said, I also used 042 copper base gasket to get deck height right.

 

MiniatureNinja

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crazypj said:
Don't touch pistons or head, you set clearances with different thickness gaskets. CR comes up a bit due to size of overbore.
If you run 0.040" piston to head you can still use 87 Octane without problems Although I try to get 0.037"~0.038" and 2:1 - 87/93 when I can't get 91 octane. Bit nervous first time I tried it but couln't feel any difference even running a couple of tans 87
XR swing arm is silver painted steel, alloy would be nice but stock XR is direct fitand much easier to weld mounts for twin shock. I would have gotten an earlier twin shock one or XL but XR was easier to find
I got my gasket kit in, and ordered a .040 copper head gasket, will have to see if I need to do something with base gasket to get the right clearance - copper base gasket worth it? seams like every time I click a thread or photo searching for info or vendors on this stuff I get a dead link or expired photo.
 

crazypj

Split personality, I fake being smart
There was a link from SOHC4.net telling you how to re-set the photobucket pictures, it worked for me with Firefox 57.??.
Very few people are going to pay the Photobucket 'ransom' of $400.00 a year, I sure as hell ain't doing it particularly as it's possible to post pictures directly to site now (just have to find all the hard drives and flash drives where pictures are stored ::) )
The way to find out what you need is have block bored for pistons then do a dry assembly without rings to check dimensions. Use a copper base gasket for better heat transfer to crankcase. When I first 'invented' the GS piston conversion I wasn't aware there were production variations in crankcase deck height (plus got lucky) so didn't tell people to dry run first (plus, I've been doing this so long I assumed anyone building a modified engine would automatically check)
I ended up taking about 0.025" off head surface plus 0.020" off block to get 'zero deck' It would have been easier to just get a thinner base gasket from Lani
 

MiniatureNinja

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I have a habit if researching the crap out of stuff before I actually commit to it, this bike has been and adventure in NOT doing that. LOL there were mistakes made (anyone ever see a scrambler exhaust on right side of the bike? no? that's because it interferes with the kickstarter.... go figure)
 

trek97

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MiniatureNinja said:
(anyone ever see a scrambler exhaust on right side of the bike? no? that's because it interferes with the kickstarter.... go figure)
I seen it once, just a bit of MAP gas and a simple tweak..Viola, easy peasy. ;)





The real trick on CB360 is keeping clear to access the dipstick.

 

irk miller

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Call Lani at http://www.coppergaskets.us/. He's a super nice guy and he has the templates to do the CB360. Once you figure out what you need, he'll make them up. Turn-around is very reasonable. Usually, within a week from order you have them in your hands. Key to using copper gaskets is a proper temper. Some will argue that the best headgasket is MULTI LAYER STEEL (MLS). Cometic can custom make them for you, if they are not in stock. A combination of a copper base and MLS head gasket would not be a bad way to go. That said, I'm running copper base and head gasket on my 378.
 

MiniatureNinja

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trek97 said:
I seen it once, just a bit of MAP gas and a simple tweak..Viola, easy peasy. ;)

http://www.dotheton.com/gallery/11494-181215062659.jpeg[img]

[img]http://www.dotheton.com/gallery/11494-170118181841-31472004.jpeg[img]

The real trick is keeping clear to access the dipstick.

[img]http://www.dotheton.com/gallery/11494-170118182654.jpeg[img]
[/quote]

oh that looks great!
nice
 

trek97

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I think Irk may have just done the same w his 360???

Yes Irk did and also thinking way back CrazyPJ did it too.

 

MiniatureNinja

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This was mine. I did it because the engine case stuck out more on this side and it seamed right. That was until I got to put the kicker on
 

trek97

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Ooo thats a really nice job. :)

Adding a couple small heat shields will make all the difference.

I made mine from some thin stainless and hose clamps. Not too pretty, just effective.
 
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