CB360's-from build to blog - 2013, MDS (Mo Dumb Shit)

Big R

Heaven is so far away.
Re: CB360- No Evil

Nice work PJ! I'm sure that took maybe a couple hours to do and it looks better than factory.
 

Rocan

"Long after I rest, my steel will live on"
Re: CB360- No Evil

mmm. pretty...

im getting one of those indicator built in headlamps now that i saw it... pretty...
 

Ringo

Active Member
DTT BOTM WINNER
Re: CB360- No Evil

Not sure how I missed this??? Great work pj. That lower mount completes the shock, looks like it was supposed to be there from the get-go.
 

JoeTee

I can't stop going once I've started, it stings...
Re: CB360- No Evil

Pj, killer machine work. I loved the clip ons you made... Im local here in Orlando, any chance I could buy a set from ya? ::)
 

crazypj

Split personality, I fake being smart
Re: CB360- No Evil

Well, checked gas in reservoir, ZERO in one side and 26psi in the other. :eek:
Checked another set, 22psi each side ???
Usual pressure is around 100psi~150psi
Shocks are getting stripped in the morning
I'll find out whats in the reservoir and base gas pressure on piston or bladder compression damping, probably start around 50psi if its a piston type
I'll take some pics of the internals as I can't find the re-build online anywhere
 

Swagger

Putting boot to ass since 1967!
Re: CB360- No Evil

New spring bases look great PJ! Very beefy, doubt you'll have breakage issues whilst catching wicked air! heh
I think the set here was sitting at 70-ish psi but very low on fluid, lots of air in the main body...which unless I'm completely off my nut goes against the whole external reservoir bit. I'll have to dig'm up again....
 

Rocan

"Long after I rest, my steel will live on"
Re: CB360- No Evil

hmmm, guess you get what you pay for.

how do you re-pressurize them?
 

crazypj

Split personality, I fake being smart
Re: CB360- No Evil

Got shock apart, had to make a few special tools and will need to order a couple of things to put them back together.
Had a hell of a time getting bladder out, managed to break Schrader valve off reservoir top (knew I should have removed it before I started) :mad:
Luckily, the bit fitted into reservoir is 8 x 0.75mm thread so I can modify a standard 'bolt in' tyre valve. (after I get the Loctited bit out ::))
Schrader is a real weird size, 7.7mm x 0.394mm pitch, only found one tap online, 70 POUNDS (about $110.00) so I ain't getting one of them :D

Quite surprised, they are not so badly made as I had expected, just not assembled too well.
They do have a shim stack and are probably a knock off of something more expensive
No pics yet, maybe in morning.
Swagger, thanks for pressure info, it will make a good starting point, any thought on suspension fluid?
I was thinking 7.5~10 wt with 75~100psi or 5wt with 50psi?
Rocan, looking at pics won't make you an instant expert on suspension (just letting you know before you start telling people how to fix shocks and set up suspension ;))
 

Swagger

Putting boot to ass since 1967!
Re: CB360- No Evil

I was reading one kats thoughts and he said 10wt (using fork oil iirc) a couple times and 125psi.
I read a forum post saying 12.5 mixed and 100psi.
I bet it's gonna be a trial and error thing. Seems like everyone thinks they are pretty stiffly sprung though......

I got a Ducati 999 (showa) rear shock and it needs to have some factory service (one of the adjusters is completely shagged...like someone used an impact driver on it or something equally ridiculous) but the fluid in it felt like 2wt mister oil!
 

crazypj

Split personality, I fake being smart
Re: CB360- No Evil

I think I'll probably go with 7.5w and start at 60psi, should help soften things up slightly
Here's pic of shock in pieces, you'll have to go to photobucket to see explanation of parts

had to make a peg spanner to get piston rod out, 23.25mm C/C.
The circular piece fits over shock body to allow a tube to be fitted so I can use nut to pull piston rod slowly and not distort body
 

Rocan

"Long after I rest, my steel will live on"
Re: CB360- No Evil

crazypj said:
Rocan, looking at pics won't make you an instant expert on suspension (just letting you know before you start telling people how to fix shocks and set up suspension ;))
dont worry, im still VERY confused. :D
 

JRK5892

New Member
Re: CB360- No Evil

wow! i pull shocks apart all the time and they are never that involved! i have used gas charged shocks on snowmobiles in the past but never on a bike, i do love how they work. i just spent the past hour going though your thread again, man i love how you point out the little things while building the motor, things like how the bee hive springs go in the heads... thank you!
 

thompsonmx100

New Member
Re: CB360- No Evil

If im not mistaken the pressure in the bladder should not affect your valve damping. The pressure in the bladder is meant to prevent foaming of the oil. i believe 125 maybe 150psi is the norm for shock bladders.
 

crazypj

Split personality, I fake being smart
Re: CB360- No Evil

Your right, the gas has no effect on the valving
The gas charged bladder provides compression damping as well as displacing air from the system. (gives the piston something to 'push' against, in a basic shock the bottom of cylinder is sealed)
The damper rod takes up space and causes the bladder to compress as it displaces oil from main cylinder.
Usual pressure on most shocks I work on is 142psi.
The gas pressure does help to extend the shock and does make 'spring' heavier.
A lower pressure and thinner oil although it will reduce damping, will also reduce the amount of 'spring'
I'll see if I can find a better explanation with some pics.
 

Rocan

"Long after I rest, my steel will live on"
Re: CB360- No Evil

im imagining a syringe filled with pressure. as you compress it more, it gets firmer. more air pressure in there, the harder it is to press down, and shock rebounds more quickly?
 

crazypj

Split personality, I fake being smart
Re: CB360- No Evil

Big Rich said:
I'm sure that took maybe a couple hours to do and it looks better than factory.
Yep, I made a pair today, (slightly different design, plus shorter)
Took just about entire day (from cutting 2 x 4" long pieces off a 12" bar I bought, (got wrong size, 2.5" dia means a lot of cutting ::))
I've checked they fit shocks, looks dam good on shock (forot to take pic) also weighed them (8.7oz ;D)
At least 10 hrs total time
 
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