Friday , 23 October 2020
Home » RC Build Blog - Tekno EB410.2 » Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX

Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX

Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX

Tekno’s EB410.2 uses a top-of-the-line set of big bore shocks. They include aluminum threaded bodies, bottom-load cartridges, massive plastic caps (with integrated bleeder hole) and a grub-screw lower portion that keeps the lower spring retainer from popping off. Good stuff!

Build Notes:
Tekno provides #600 weight fluid with the kit (equivalent to 60wt), but I would check with your local track to see what guys there are running. Building shocks with the right fluid the first time is way more fun than having to rebuild them later.

Fluids will be used in this step, and that can get messy at times. Some rags or paper towels should be handy for cleaning up any spills.

Step 1:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
The kit shocks come with 5 different o-rings in the kit (from left to right): shock collar o-ring, inner shock cap o-ring, lower cartridge o-ring, internal cartridge X-ring and bleeder screw o-ring.
Step 2:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
We’re going to work on the front shocks first – build your pair of front shock shafts. A light drop of threadlocker on the screw is suggested.
Step 3:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Install some o-rings; one pair into the shock collars, one pair over the bottom of the shock cartridge area.
Step 4:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Install one more pair of o-rings into the shock caps. Take an extra moment here to make sure these seat all the way in the cap.
Step 5:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Assemble the bottom shock cartridge; blue X-ring, plastic guide, another X-ring and the final guide (note the lip on this last part – it should be facing away from the shock body). Screw on the shock cartridge cap.
Step 6:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Apply a small amount of shock fluid to the threads of the shock shaft assembly…
Step 7:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
…and slowly slide it through the body. The fluid helps prevent the threads from tearing the X-rings.

Press the aluminum ball into the shock bottoms, then install the bottoms on the shafts. Tekno has the gap between the bottom cartridge and the shock bottoms at 23mm – I screwed the shock bottoms on until I reached that gap.

Install the shock collars; a slight drop of shock fluid on the body – at the start of the threads – will help lubricate the thread and make installing the collars much easier.

Step 8:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Fill the shocks with fluid, then SLOWLY pump the shaft up and down until all the bubbles have been released from under the piston. Set the shock aside so the bubbles can rise and dissipate. Build 2 shocks.
Step 9:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
While we’re waiting for the bubbles to float away, let’s check out the shock caps. Here you can see that Tekno has already pre-drilled the caps – love this!
Step 10:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Slide the bleeder screw o-rings on to the screws.
Step 11:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
With the piston pulled all the way out of your shocks, add a little more fluid until it is crowning the top of the shock, then attach the cap. Compress the shock all the way, then install the bleeder screw.

Most likely a little fluid will come out of the bleeder hole in the cap, so be prepared with some towels for clean up.

Step 12:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Install the front spring and the lower spring retainer. Use the M3x8mm grub screw to retain the spring retainer.
Step 13:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
The rear shocks are similar to the fronts, only longer. Build like the fronts up until this point, using the manual-set 29mm as the shock shaft gap length. The only difference is the addition of the black o-ring on the shaft.
Step 14:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Add oil, release the bubbles, add the cap and bleed. Add the spring and lower retainer; add the grub screw.
Step 15:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Add the shock cap bushings to all 4 shocks. Your pretty little dampers should look like this, ready for install.

Clean off any extra fluid that may have come out during the bleeding process.

Step 16:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Install the front shocks – mount on the tower, outside hole in the arm. Make sure you use the reverse-thread chrome screw on the right side of the car, the normal-thread black screw on the left side.
Step 17:
Tekno RC EB410.2 4WD Buggy Build Part 7 – Shocks | CompetitionX
Install the rear shocks – mount on the tower, inside hole in the arm. Make sure you use the reverse-thread chrome screw on the right side of the car, the normal-thread black screw on the left side.

Shocks in place, ready to soak up the track! Awesome job! Let’s gather your electronics and move on to Part 8!

Use the links below to follow each step.
Tekno RC EB410.2 4WD Buggy Build – Opening Page
Tekno RC EB410.2 4WD Buggy Build – Part 1 – Differentials
Tekno RC EB410.2 4WD Buggy Build – Part 2 – Steering/Front Bulkhead
Tekno RC EB410.2 4WD Buggy Build – Part 3 – Rear Bulkhead
Tekno RC EB410.2 4WD Buggy Build – Part 4 – Rear Suspension
Tekno RC EB410.2 4WD Buggy Build – Part 5 – Front Suspension
Tekno RC EB410.2 4WD Buggy Build – Part 6 – Chassis Assembly
Tekno RC EB410.2 4WD Buggy Build – Part 7 – Shocks
Tekno RC EB410.2 4WD Buggy Build – Part 8 – Electronics
Tekno RC EB410.2 4WD Buggy Build – Part 9 – Final Assembly

About Tony Phalen

Tony Phalen - As an avid RC enthusiast, Tony has been building, bashing and racing RC Cars for over 25 years. He has raced everything from 1:18th scale trucks to 1:5 scale motorcycles and everything in-between. He's also worked on both sides of the industry fence; working at and with many major manufacturers (as well as being a sponsored driver) to working for a high-profile industry magazine. During this time he has learned many tricks, tips and techniques and has transferred that knowledge to CompetitionX - the most informative RC website on the internet!

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