Tracker/Cafe Racer - FJ600

[dano_02]

Hey acm177,

The linkage has recently been changed, but you can see some detailed photos and CAD images on my blog. Check it out:
http://danojung.blogspot.ca

Cool linkage on the rear suspension. Can we see a close up?

 

[dano_02]

I haven't posted much on here in the last while because I've been busy working away! Since my last post I've built a seat plug (to be used for making a seat mold), rebuilt the engine, stripped all of the components and am now reassembling everything to check fitment before paint. Next project - making a seat mold.

Enjoy!

 

[smarsh]

Looking good, nice work man! Did the engine need much work?

 

[dano_02]

Not much work was required on the engine. I replaced the seals, honed the cylinders and replaced the piston rings. Other than that, it was mostly cleaning.

Looking good, nice work man! Did the engine need much work?

 

[Patmanbbe]

that isn't the stock gas tank. what bike is that tank from? was it a direct fit?

 

[dano_02]

Suzuki GT380 1975.

More or less a direct fit.

 

[adventurco]

Looking good mate. I'm liking the lines on the seat, and way to use the flat-pack method to make the mold ;D

 

[jpmobius]

Lots of very nice work! I am very curious to learn more about your process in designing the rear shock linkage. Did you do an animation or end to end (travel) analysis of the rate? "Eagle eye" engineering makes me think the spring and shock will be overpowering. You have some fairly strong angles and unexpected rocker arm ratios - but not seeing your version 2 unless it is nearly the same as the original. Really like the basic concept style wise, any pics - solid works or actual of the system fully compressed?

 

[canyoncarver]

Cool bike build. I have that same engine in a Radian.

 

[strang]

like it!

 

[dano_02]

Lots of very nice work! I am very curious to learn more about your process in designing the rear shock linkage. Did you do an animation or end to end (travel) analysis of the rate? "Eagle eye" engineering makes me think the spring and shock will be overpowering. You have some fairly strong angles and unexpected rocker arm ratios - but not seeing your version 2 unless it is nearly the same as the original. Really like the basic concept style wise, any pics - solid works or actual of the system fully compressed?

Thanks!

I used SolidWorks for the design and FEA aspect. The shock is from a BMW 1000rr so I matched the bike's free and static sag values as best I could, which set the direction for my rocker arm lengths. Then I balanced the lengths and angles to arrive at a reasonable amount of wheel travel and spring compression under full load (2g on bike and rider). For this task, excel worked well as there are obviously many variations so it was about finding a balance between all of these variables.

Once I had a rough idea of geometry, I printed the parts in ABS and installed them to check fit and actual angles on the bike.

Not sure how it will perform on the street - we'll see! Would be nice to connect linear transducers to collect data and analyze response but that's a whole other project.

Dan

 

[damarble]

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