THE COMPLETE ALL-IN-ONE GUIDE FOR YOUR SUSPENSION

Proper installation and maintenance of your bike is your responsibility and when done properly helps reduce the risk of injury and damage to your bike. We recommend all service and repairs be performed by an authorized Sirris dealer or service center.

OWNER'S GUIDE

Follow the guidelines and instructions provided in this owner’s guide so that you are able to properly set up, use, and maintain your new Sirris suspension products.

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BREAK-IN PERIOD NOTE

The Sirris F43 fork is a symmetrical closed cartridge design with two independent sealed dampers. It will break-in over the first 5 hours of use with significant improvements in friction. We recommend that you don’t make significant changes to clicker positions or valving until after the 5 hour break-in period.

WARNING AND SAFETY INFO

Sirris products should be installed by a professional suspension technician and must follow Sirris installation procedures. Improperly installed suspension can fail causing rider to lose control resulting in SEVERE INJURY OR DEATH. 

Worn or damaged suspension components can negatively impact performance and safety of the motorcycle. If suspension components appear worn or damaged, contact an authorized service center for assistance.  

Do not alter or modify any part of Sirris products in any way. It may cause product failure resulting in SEVERE INJURY OR DEATH. 

Misuse of Sirris suspension may cause failure, resulting in damage or SEVERE INJURY OR DEATH. 

DO NOT carry more than one person on a vehicle installed with Sirris suspension. 

Improper service or use of non-Sirris parts with Sirris suspension may cause the fork or shock to malfunction, resulting in SEVERE INJURY OR DEATH. 

If your fork loses oil, makes abnormal noises, tops or bottoms out easily, do not ride the Sirris suspension. Contact Sirris or an authorized Sirris service center for repair, service or inspection. 

Sirris suspension may fail under rare circumstances that cause bending and/or breaking to any part of the fork or shock. Anything that causes loss of nitrogen, oil (such as a collision or extended periods of non-use) may also cause your fork or shock to fail. A damaged or leaking product could fail, resulting in a crash and SEVERE INJURY OR DEATH. If you think your product has been damaged or not working properly, do not ride and immediately contact Sirris or authorized Sirris service center for inspection or repair. 

SERVICE INTERVALS

SERVICE INTERVALS

To best maintain the performance and durability of your product under normal use, Sirris recommends that you have regular fork and shock maintenance performed according to the service intervals listed below. 

It is important to remember that service intervals can vary depending on climate, trail conditions and riding frequency. Servicing your suspension requires special knowledge and tools. If you are unsure about working on your own suspension, contact your authorized Sirris Dealer for more information on general suspension maintenance.

Failure to follow these recommendations could affect your warranty.  

Long term non-use: If the motorcycle has been sitting unused for more than one year, complete inspection is necessary and maintenance is recommended. 

WARNING: Modification, improper service, or use of aftermarket replacement parts with Sirris forks and shocks may cause the product to malfunction, resulting in SERIOUS INJURY OR DEATH. DO NOT modify any part of a fork or shock, including the fork clamps, steerer, upper and lower leg tubes, or internal parts, except as instructed herein. Any unauthorized modification may void the warranty, and may cause failure or the fork or shock, resulting in SERIOUS INJURY OR DEATH. 

WARNING: Sirris products should be serviced by a qualified service technician, in accordance with Sirris specifications. If you have any doubt whether or not you can properly service your Sirris product, then DO NOT attempt it. Improperly serviced products can fail, causing the rider to lose control resulting in SERIOUS INJURY OR DEATH. 

OIL REPLACEMENT

Oil replacement intervals are highly contingent upon intensity of use and environmental conditions. Use specified Sirris replacement parts during service for the highest performance and longevity. 

Note that heavy use in muddy environments can cause debris ingestion and trigger a shorter rebuild cycle.

OIL NOTE Sirris uses Shell Tellus S2 VX15 (5wt) in the fork cartridge and Shell Tellus S2 VX68 (20wt) as the bath oil. These are cross compatible with other high quality 5wt and 20wt suspension fluids.  Sirris uses a semi-synthetic 2.5wt oil in the shock that is also compatible with other high quality 2.5wt aftermarket suspension fluids. 

You can use 5wt/20wt oils of your preference, Lubefinder.com can be used to source the fork oils. KYB K2C can be used in the shock and has wide availability.

BUSHING AND SEAL SERVICE

As with oil replacement, seal and bushing service intervals are highly contingent upon intensity of use and environmental conditions. Use specified Sirris replacement parts during service for the highest performance and longevity.  

Change fork and shock seals and bushings anytime leakage occurs.  

TORQUE SPECS

For both performance and safety reasons, using a torque wrench is mandatory when installing your product. Torque specifications for individual parts on the Sirris form and shock are listed below, as well as in the step by step assembly instructions later in the manual. For general vehicle maintenance please consult the torque specifications of the component you are adjusting.

f43 fork installation

Make sure your tools are in good condition. A worn allen key can round the hex on a bolt not allowing for proper torque. Torque settings are listed throughout the instructions in this manual. It is important to prep all bolt threads.

WARNING: Follow your brake manufacturer’s installation instructions for proper installation and adjustment of the brake system. Failure to properly install and adjust your brakes can lead to a loss of control of the motorcycle which can result in SERIOUS INJURY OR DEATH.

TOOLS REQUIRED

  • Torque wrench (3-70 Nm)
  • Grease
  • Medium strength Loctite
  • Allen keys (3 mm, 4 mm, 5 mm, 8 mm, 12 mm)
  • 10 mm socket
WATCH ON YOUTUBE

INSTALL PROCEDURE

  1. Remove 12 mm top cap 
  2. Loosen 5 mm upper clamp bolts 
  3. Remove upper clamp 
  4. Loosen 5 mm lower clamp bolts 
  5. Remove both fork tubes 
  6. Grease lower headset bearing 
  7. Install Sirris lower clamp into bike
  8. Tension steer tube bearing to rider preference 
  9. Route cables over the lower clamp 
  10. Place Sirris upper clamp on bike 
  11. Put stock washer on top cap 
  12. Install and lightly snug top cap 
  13. Move handlebars over clamps, install front number plate 
  14. Clean fork outer tubes at clamping surface thoroughly with alcohol or brake cleaner 
  15. Install to the appropriate height for your setting. Refer to user manual for height settings 
  16. Rotate tubes so graphics are facing out, evenly on both sides. (air bleed screw will face directly forward or backward depending on air bleed screw position).  
  17. Add grease to the clamp bolts. When new from factory, the bolts are already greased and can skip greasing when new.   
  18. Torque bottom clamp bolts (top-bottom-top) to 10 Nm with grease 
  19. Torque 12mm allen top cap to 70 Nm 
  20. Torque top clamp bolts (top-bottom-top) to 10 Nm with grease 
  21. Place handlebars in original location
  22. Medium strength Loctite 8mm handlebar bolts 
  23. Re-install Handlebars. Refer to Surron manual for this step and specified torque. 
  24. Install 10 mm brake line guide bolt and torque to 3 Nm 
  25. Install fender with four 10 mm bolts 
  26. Remove 3 mm fork guard brake line guide bolts and plastic top plate 
  27. Install brake line and sensor wire, put top plate back on and snug the 3 mm bolts. Do not over-tighten. 
  28. Install lower sensor wire to wire guide with zip tie
  29. Install wheel and axle
  30. Torque axle bolt to 60 Nm. You may need to temporarily snug non brake-side dropout bolts to achieve axle torque.
  31. Torque brake-side dropout bolts to 10 Nm with grease
  32. Loosen non brake-side dropout bolts
  33. Cycle fork and brakes and ensure non-brake side is floating freely on axle 
  34. Torque non-brake side dropout bolts to 10 Nm with grease
  35. Install sensor wire to dropout
  36. Apply medium strength Loctite to brake bolts and torque to manufacturer’s specs

R46 SHOCK INSTALLATION

Stock Ultra Bee triangle fitment:

For guaranteed fitment on your Surron Ultra Bee, we highly recommend the Sirris rear triangle installed during the shock installation procedure. The Sirris shock is designed to offer the maximum possible piston size and still fit within the stock linkage. Tolerances on each stock Ultra Bee vary. Light contact between spring OD and stock triangle may occur. We highly recommend our higher clearance triangle to prevent this.

WARNING: Some aftermarket triangle links may have significant interference that could damage the shock and/or triangle. It’s important to check clearance as you assemble and cycle the suspension. Do not install Sirris shock if any interference is detected. Failure to properly install the shock with proper triangle can lead to a loss of control of the motorcycle which can result in SERIOUS INJURY OR DEATH.

TOOLS REQUIRED

  • Torque wrench(es) 5-60 Nm
  • Grease
  • Medium strength Loctite
  • Allen keys (3 mm, 6 mm, 7 mm, 12 mm)
  • Sockets (13 mm, 14 mm, 15 mm)
WATCH ON YOUTUBE

INSTALL PROCEDURE

  1. Insert key and remove seat 
  2. Remove two 3 mm plastics bolts 
  3. Remove all four 6 mm subframe bolts  
  4. Remove subframe 
  5. Remove top shock bolt 
  6. Remove linkage bolts 
  7. Remove shock 
  8. Remove stock triangle link via the 2 single shear bolts at the front and the single through-bolt on the rear. 
  9. Remove linkage from shock 
  10. Clean and grease linkage 
  11. Reassemble linkage, triangle and shock. Use Surron recommended torque specs.
  12. Attach shock top bolt using Surron torque specs
  13. Attach linkage to Surron swingarm using specified torques. Lift rear wheel if needed to align the bolt.
  14. Mount Sirris triangle using Loctite on 2 front single shear bolts. Use Surron recommended torque specs. 
  15. Reattach subframe and plastic bolts 
  16. Tighten all subframe bolts and torque to Surron’s specifications 
  17. Reattach seat  

FORK AND SHOCK TUNING OVERVIEW

Sirris offers a wide variety of tuning options to fit your riding needs. The internal tuning is accomplished by mixing the perfect match of spring weight, compression settings, rebound settings, preload settings and oil weight. All are internally adjustable and serviceable by a trained technician or service center.

Hard Enduro Tune* 

Hard Enduro tune is a race-only tune that maximizes plushness and extreme terrain capability at the expense of other riding types. At slower speeds, it’s designed to soak up the impact of the roughest chop and boulders. This tune has a highly progressive damping character with super soft low-mid speed damping paired with a high speed damping catch. 

Trail Tune

Trail Tune is a very versatile and aggressive tune that is sporty and supportive, designed to go fast over a wide variety of terrain. This tune is not Hard Enduro soft but is surprisingly capable on the nastiest terrain. It’s also not a Moto tune but has pretty good bottoming resistance on g-outs and small jumps.

EBMX Tune

EBMX tune is specifically made for modified bikes in collaboration with EBMX.  It’s designed to work with a longer travel front fork (260mm) and is intended for a mix of light moto and aggressive trail. It uses a firmer fork tune than Trail tune for bottoming resistance and a stiffer rear spring to handle increased bike weight and power delivery of EBMX components.

MX Tune

MX Tune is a motocross specific tune with balance, control, and bottoming resistance for the fastest speeds. Firm suspension for maximum control and support for huge jumps, whoops and fast cornering. If you select the EBMX or MX spec, you’ll compromise a bit of trail plushness for improved bottoming resistance.

SX Tune*

SX Tune is a super aggressive firm tune to handle the biggest landings. Ultra firm to absorb the biggest hits.

*NOTE: Hard enduro and SX Tunes are currently not available for sale from the factory. A Sirris service center will have the appropriate parts to retrofit these specialized race tunes.

TUNING DETAILS / RIDER WEIGHT RANGE

Every rider, every riding style. Sirris offers three weight ranges to choose from when selecting your suspension.

Listed weight ranges are body weight + 20 lbs for gear.

LIGHT  130-170 LBS

MEDIUM  170-210 LBS

HEAVY  210-250 LBS

SETTINGS NOTE: Settings are number of clicks from the closed position (full clockwise). Once they are in the closed position, back them out (counter-clockwise) according to the number of clicks indicated in the chart above to get you to factory settings.

*SPRING RATE NOTE: see next page for additional spring rate information

**OIL NOTE: Sirris uses Shell Tellus S2 VX15 (5wt) in the fork cartridge and Shell Tellus S2 VX68 (20wt) as the bath oil. These are cross compatible with other high quality 5wt and 20wt suspension fluids.  Sirris uses a semi-synthetic 2.5wt oil in the shock that is also compatible with other high quality 2.5wt aftermarket suspension fluids. You can use 5wt/20wt oils of your preference, Lubefinder.com can be used to source the fork oils. KYB K2C can be used in the shock and has wide availability.

SPRING RATES

It is not unusual for riders to require spring rates different than what we offer on our light/medium/heavy tunes. If you’re at the heavy end of one of our categories, you may choose to go up a rate based on your riding style. The inverse is true if you’re at the bottom of one of our categories. Heavily modified bikes typically need a 10 N/mm rate bump in the rear. Riders who ride with their weight back or who ride seated may need more rear rate and may need to drop the forks to properly weight the front. An unweighted front is the most common cause of fork harshness.

Sirris offers a full selection of rates for your tuning needs. When rates vary greatly from stock, valving changes may be required to optimize performance.

FORK SPRING RATES 

F43 spring rates (in N/mm) available are: 4.0, 4.4, 4.8, 5.0, 5.4, and 5.8.  Refer to chart above for spring weights included.

Fork springs for Sirris F43 forks are sold as individual units. Two springs are required for your fork. You can combine two sequential rates to get an “in between” total fork spring weight if desired. 

For example, our standard Surron Trail Med Rate is 4.6 N/mm. It has a 4.4 one side, and 4.8 on the other side to get the average of 4.6 for the fork. 

Stiffer rate spring should always be placed in brake side leg.

Oil and clicker settings should be the same on both sides, you do not need to individually change any settings on your left or right fork leg if you use two different spring rates.

SHOCK SPRING RATES 

R46 spring rates (in N/mm) available are: 75, 85, 90, 95, 105, and 115. Refer to chart above for spring weights included.   

If you upgrade your bike with a larger battery, we recommend going up 10 N/mm spring rate to accommodate the heavier bike weight.

Surron Ultra Bee shock springs require a spring compressor because of the short shock length. Max preload = 20mm 

ADJUSTMENTS

SAG RANGE AND BALANCE (Sag is measured with rider in riding gear, standing on pegs in riding position.)

Before changing clicker positions, always make sure the balance of your bike is correct. Too much weight on front or rear will be felt as harshness, instability, or inconsistent grip. Sag is the amount your suspension compresses under your weight and riding gear. Rear sag should be between 25% and 30%. If your rear rider sag is greater than 30%, your fork will not work as intended. An unweighted front is the most common cause of fork harshness. Front sag should be between 12% and 18%. Adjust as needed with preload, spring rate, and fork clamp height. Turn your compression adjusters to the closed position (full clockwise) until they stop. Then back them out (counterclockwise) according to the number of clicks indicated in the charts on previous page.

SAG SET-UP 

  1. Start with recommended rebound, compression, and preload settings.
  2. Adjust rear shock to recommended sag by changing spring preload*. If preload is greater than 8mm, go up a rate. If less than 2mm, go down a rate. If you ride with your weight more back, run sag closer to 25%. If you ride with your weight more forward, run sag closer to 30%.
  3. The best way to adjust fork sag is by changing spring rate. Stock preload is 5mm. You can safely use 0mm but may experience some spring rattle at full extension. You can safely use 10mm or 15mm but you may need to add more rebound damping than optimal. (this is closed cartridge damper, pre-load is adjusted via circlip groove on outside of the cartridge. Grooves are in 5 mm increments.)
  4. Adjust fork position in clamps to achieve the correct balance on bike. If the fork rides high in the travel and feels harsh, move forks up in clamps (move front of bike closer to ground). If greater than 10mm of the outer tube is showing above top clamp, your front or rear spring rate is likely incorrect. Conversely, less than 2mm implies there’s an incorrect spring rate. 5mm and 10mm positions are marked on the gold outer tube.
  5. Adjust clickers by changing 2 clicks at a time. If your suspension is properly balanced and sprung, changing 2 clicks will be felt as a noticeable good or bad change.
  6. When you increase rebound, remove the corresponding number of compression clicks to keep overall force capacity. For example, 2 clicks less rebound should be paired with 2 clicks more compression.
  7. If you find yourself within 5 clicks of full open or closed, something is wrong. It could be either your spring rate, fork height, or the tune could be incorrect for your riding style.