[RVP3]

Remember when Murray was polite?

http://cx500forum.com/forum/technical-help-forum/4254-78-carbs-1980-a.html

Ahhh... Those were the days!

 

[murrayf]

This is all a much gone over topic but here is the main crux Recycling any exsisting mono shock into a direct action has 2 Major flaws and they are as follows The original design they come from uses a linkage system That linkage system reduces the total travel the shock needs to move . So when used in a direct action the stroke of the shock does not provide enough swing arm travel The same reduction linkage is why the shock needs a much stiffer spring buy close to plus 40 percent in order to support theLevered weight excerted on the shock by direct action Hence the pogo stick comment This is all stuff that has been tried proven discussed And worked thru It is also basic engineering in fact in last weeks,Exact same discussion i quoted Archemides on it

 

[purplecx500]

there are very few non lever mono shocks as the lever

changes everything as a rising rate the valving is completely

different to a linkless system, the progressive rising rate

has to be in the spring and this makes it impossible

to just change to a heavy spring the damping would

be Insufficient exacerbating the "Pogo"

the KTM I heard has link-less system but I have been unable to

find what model If it even exists.

I like the idea of a mono shock.

But at this point the expense to do the conversion

is not cost effective.

Except for the system that was in the build thread

posted,or somthig very similar.

Crickets are a symbol of Silence and peacefulness

something we should have ,sometimes its wise not to post

till we think things over,and let cooler heads prevail.

Having a low tolerance for stupid i try to avoid it myself,

sometimes no comment is the best message.

 

[guelli02]

something we should have ,sometimes its wise not to post

till we think things over,and let cooler heads prevail.

Having a low tolerance for stupid i try to avoid it myself,

sometimes no comment is the best message.

Good point.

But persons with a so called helper syndrome will not stop posting their help/hints/tips/recommandations/their own truth/jokes/..........



But swarm intelligence isn't bad

 

[ChopperCharles]

If anyone does find a shock that works for those eBay kits, let me know. I'd love to have a setup like that on a bike. It looks really sweet... unfortunately, I want my bikes to handle...

Charles.

 

[purplecx500]

thick skin, you know how guys are if you show

any weakness you will become the target.

just go forward.

http://www.yssusa.com/suspension_problems.html

 

[reclinedrelic]

If one wants to use a shock from a linkage type application on a CX500 with a simple mount on the swing arm, is it possible to have a linkage mount for the top of the shock instead of the bottom?

 

[ramprat06]

Don't pay any attention to me, just a short thread-jack.

 

[murrayf]

if you weight the srung weight of the bike loaded with the driver (and passenger is so desired)

then deduct the unsprung weight

and you measure the fulcrum point to axle and fulcrum point to swingarm bearing center

plus the desired range of motion at the fulcrum point

then a shock can be made or tailored for your application

if anyone needs help with the calcs just ask

 

[murrayf]

me testing the water

78 carbs on a 1980?

 

[purplecx500]

Yes the linkage could be at the top.

I could't say where you could score 1 that would

work for you.

 

[ChopperCharles]

Hmm, KTM Duke has a shock bolted directly to the swingarm and to the frame. No linkage. It's a very light bike, though, so who knows if it will work on a modified CX.

Charles.

 

[purplecx500]

Victory Motorcycle: monoshock Pro-Link system di Honda Tralis?

As you can see from the animation

applying this principle to a top mounted

lever system will be a real challenge.

 

[purplecx500]

I revisited the images of the KTM

it got a HUGE rear travel and a high ratio of

wheel travel to shock compression less

travel needed for cx means more mechanical

advantage for the shock.

basically this shock seems to have possibility's

you will need to get the specs and do the math

to decide.

going to be as pricey ,maybe less than others

due to the quantity factor.

Watching.....

 

[Thumper]

I know I have seen plenty of cafe builds that feature a monoshock Cx but have no idea of what shock they used or if it worked worth a damn.

 

[murrayf]

so far (and i collect info on this ) none of teh direct acting shocks work right if you are over 150

and the spring rate will not fix the issue alone as the dampening and rebound is a mess to

the bikes i have driven slump when you gun it so even with my carbs for get ever doing a wheelie

i wish some of the people who have done this would fess up and write about it and the crappy handling

and stop some of the copy catting

 

[JakeSH]

Soooo.... what I'm getting from this thread is its better for me to just stick to dual shocks. (I can't even weld, let alone do the engineering of swingarm/shock fabrication)

 

[Thumper]

You might search for a GL swingarm conversion with a Prolink shock mounted to a plate at the top of the CX main frame , but sounds like not worth the effort.
Which points out why CX cafes are more popular (prettier) than GL cafes due to the typical habit of CX cafes to cut the entire ass off, weld on a seat holder, convert to monoshock, put on pods which neatly flank the frame centertube, trash the H-box for straight pipes, locate underpowered lithium battery where the H-box used to go, run the exhaust pipes right by your lower legs with wrap to mitigate burns, etc...etc...
Am I missing any?
Check out the cafe websites for the latest fashion.

 

[murrayf]

Not unless you just care about looks Or are willing to pony up for a custom shock

 

[purplecx500]

There you go.

Have source for hardware

that's suitable/cheap.

Basically need a baseline for

spring rate appropriate to

the load/leverage/ location

on the CX swing arm.

Damper adjustable/serviceable.

Travel 6 to 9 inches.

Want to brainstorm

and collaborate, you know

how to contact me.

Either way I'm going to

try.