> Description

As the inventor of the Centax clutch, the 2-speed gearbox and many other things that are now industry standard, we also integrated some new solutions on the suspension.

Another major point of development was to reduce weight, reduction of vibrations and ease of set-up and maintenance.

Ultra-narrow chassis with improved flex characteristics. The chassis is milled down in less load-stressed areas to make it as light as possible and still remain stiff in areas where needed.

We kept the possibility to have a weight in the very bottom which is easily adjustable in it’s position.
At the same time we improved the way it is it mounted to reduce vibrations by using a carbon weight bridge which is mounted in anti-vibration rubbers.

We also have added 2 more locations for another weight, one underneath the engine and another one underneath the servosaver.

The central weight bridge allows the use of max 3 weights

All weights are mounted as low as possible to improve the center of gravitiy

The brake now features a 2.5mm thick disc with improved ventilation and braking stability

The pulley adapter is a much lighter construction for better inertia and improved acceleration

A new shorter internal gear ratio of 2.4 helps acceleration and increases the active range of the overall gear ratio. Using 19/24 now is almost like 18/23 on the 988.

Also the overdrive has changed slightly to have the perfect rear/front drive balance with ENS and EFRA hand out tires

New side belt tensioners improve clearance with the engine manifold.
It also reduces vibrations on the sidebelt.

The new super-light midshaft assembly also acts as adjustable belt tensioner as well as pipe wire holder

The completely new gearbox has less inertia than the one from the 988. This improves acceleration.

Despite being lighter it offers new features to improve reliability and consistanty

New shaped fueltank mounted on top of the radioplate.

The new tank is more consistent in adjustment no matter if it’s full or almost empty.

The new tank seal keeps a higher pressure and keep things dry and clean
The cap of the tank is higher to allow even faster refueling.

The volume of the tank is 125cc and needs to be adjusted by the user to perfect volume inside the rules by using inserts

New superlight, one-piece bumper for improved aerodynamics.

n this way it is possible to change heave adjustments more or less independent of roll adjustments.
As an example it is possible to have a very light roll damping combined with a very high heave damping, something which is not possible with a classic suspension.
The third damper can be used to only alter the damping characteristics without a third spring, but also to add a spring to alter spring rates for heave
The front and rear heave sets are available as an option.

Other main specs

- 4wd belt-driven race car
- Serpent spring steel axles with quick change system for the wheels
- Front and rear spring steel cvd shafts
- NSK bearings for the transmission
- Low friction belts and ball raced belt-tensioner
- Black anodized front shaft with one-way bearings and narrow rear solid axle
- super low inertia 2-speed gearbox
- Independent suspension with hydraulic low-friction shock absorbers
- Ball raced front and rear anti-roll bars

7075 T6 Aluminium 5mm chassis plate
The 5mm aluminium chassis has perfect symmetrical shape for even flex and weight distribution. The ultra-narrow chassis is very light, while it still remains strong in critical places. The Viper 989 logo is laser engraved.

The newly developed front bumper is a very light and easy to use design.
The strong aluminium front body posts are eccentric, to allow movement of the body a few mm forward and backwards to optimize steering and downforce.

The steering blocks, which are equal left and right, offer a system to change the axle position to a “trailing” or “leading” position, and the ability to change the kingpin-inclination and offset. This allows multiple options to fine tune steering balance in all phases of the corner. The steering block features an aluminium plate to connect the spring steel track-rods. They have 2 Ackermann options.
Optional carbon fibre disks can be mounted on the side of the steering blocks and uprights for aerodynamic adjustments.

The long durable front lower wishbones are in a new hollow type design with closed bottom for improved aerodynamics and have separate top mounted moulded inserts. An aluminium shock mount plate is screwed onto the lower wishbone. This allows the shock attachment point to be placed further outwards improving shock motion. The front lower arms are mounted to the front brackets with nylon holders. The kit includes 2 versions: in and out. This system also enables quick and easy front drive shaft maintenance.

The left and right interchangeable upper arms are mounted with 3 position nylon suspension pin inserts. The 3 position inserts allow camber-change adjustments and are held in place by the anodized aluminium top brackets. Below the top brackets, spacers can be used to change their angle or height. Caster is adjusted with clips on the upper pivot pins. The same clips are also used on the lower pivot pins to change wheelbase.

The wire type front anti-roll bar is ball raced. It is easy to change and adjust due to the open front end design. The standard wire is 2.5mm and 2 optional thicknesses are available. The pivot ball link system directs the suspension movement to the bar and allows easy tweak adjustment.
The steering blocks are connected to the arms with spring steel 8.5mm pivot balls, which run very smooth and well protected in nylon cups, and are easy to adjust with a 2.5 hex tool.

Optionals
A large selection of optional parts is available to even further improve performance, speed, weight and looks.
www.serpent.com/903018

Communications
- Website
- Promopage
- Facebook page
- Viper 989 Facebook user group
- Serpent Advanced user Manuals pages
- YouTube video’s
- Online set-up sheets
- Support from distributors, dealers and team drivers worldwide

Merchandising
A nice selection of shirts, sweaters, jackets, caps, bags, tools and decals.

Design
Serpent Viper 989. Designed by Michael Salven.
With great help from all team-drivers and 988 drivers!