Harley Davidson Sportster Thunderstorm

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freespirits-sportster-xl-thunderstorm-90We decided to work on a XL883R. We think to improve his sportive look and his dynamic characteristics. A lot of things will be the news; the most important it’s the elaboration of the engine that will be bring to 90inch that corresponds to 1470cc, a new complete exhaust system very “race style” and the open primary belt.
We will mount also new wheels of Kineo and of course our clip on bars, triple trees and  footrest. For more info and photos follow us on our new blog https://www.freespiritsparts.com/blog.

freespirits-sportster-xl-thunderstorm-90And here our list of code that we mount on this bike:

049907: This unit that uses generation 3 Dobeck TFI technology and has several advantages over previous models. With this fuel injection unit mixture adjustment is by means of 3 push buttons on the top face of the controller. Supplied with new simplified instructions. Part for Harley Davidson Sportster 883-1200 07-13 and XR1200.

403910: Adjustable and articulated, brake & clutch levers made entirely in Italy by Bolcato racing with high quality alloy. Micrometer precise screw to adjust lever distance. Pivoted levers that fold away upwards, to reduce chance of breakage in case of crash. Simply pushes back into place.

freespirits-sportster-xl-thunderstorm-90 freespirits-sportster-xl-thunderstorm-90

201200: This kit, for Harley Davidson XR1200X, considerably improves original fork, which has an almost absent hydraulic, into a well controlled, progressive and stable unit.
New valve kit, increases front stability, braking characteristics by consenting a perfect control of deceleration even under the hardest braking, it increases the grip entering and exiting a curve thanks to the immediate hydraulic control.
Fork Valve kit contains:
- Billed Ergal pistons (according to the application) for Rebound and Compression
- Fluxed passage holes with centesimal tolerance
- Pyramid shims packs with degressive and linear damping
- Sealing band with high sliding performances
Packaging contens detailed instructions, with attached shims chart.

201201: Progressive springs whereby the top half is easily compressible and compression of the bottom half is much harder, combined with high quality fork oil it’s a warranty that the results is a perfect set-up for every situation. Progressive Spring kits, for Harley Davidson XR1200X, are designed to be fitted to your standard fork improving braking distance, handling, comfort, safety and even lap times. This kit comes with a complete package that includes springs and fork oil.

201206: This kit considerably improves original fork, which has an almost absent hydraulic, into a well controlled, progressive and stable unit. New valve kit, increases front stability, braking characteristics by consenting a perfect control of deceleration even under the hardest braking, it increases the grip entering and exiting a curve thanks to the immediate hydraulic control. You can use original springs and oil.

201213: Suspension riser kit is developed to raise the rear suspension by 58 mm on 04 onwards Harley Davidson Sportster models. Gives more sporty stance and reduces front fork trail for faster steering.

201300: Black anodized Pre-Load aluminum cap to replace original fork tube plugs. Can be easily mounted on tubes thanks to a special 1'' 1/4 anti-scratch socket (included on first kit). Smaller hexagon (19 mm ¾ inch) can easily and quickly load up to 10 mm fork spring. An additional central Allen head bolt is used to facilitate maintenance and oil change without the need to remove the fork tube plugs.

201903: While top shock absorber was created to purely aesthetic, the bottom paddocks stand bobbins with new galvanized steel mounting hardware not only add more secure rear support but also acts as a protection.

202302: This kit for Harley Davidson Sportster, made in lightweight CNC machined billet aluminium, replaces top and bottom triple clamps and it measure 8 inch wide. The increased size of the plates gives more rigidity and control. Kit ready for replacement, including shaft, wheel spacers support for the original lighthouse and dashboard. Spare parts available for this kit.

202400: Clip-on lightweight and machined from solid to ensure the maximum resistance, with collar of 55 mm to set directly on the original fork. Clip on bars 25,4 mm, removable in seconds, with an angle of 8 degrees. For this kit spare parts are available. (Please note: handlebars are ’dimpled’ so stock controls can be fitted). Note: Not compatible with OEM top triple trees.

202407: This part for Harley Davidson & Buell XBS is designed to make possible to fit our dash board kit 209013 - 209015 to models with one piece riser mounted instruments or simply an aesthetic modification.

203705: This kit gives increased stopping power with greater fade resistance. Kit includes two CNC machined caliper relocation brackets (black anodised), two of the latest generation 320 mm brake rotors and fixing bolts. The brake rotors features heat treatment throughout the braking surfaces for better performance. The hubs feature floating pawls in aluminium. Mounts easily on exisiting fittings.Part for Harley Davidson Sportster. For this kit spare parts are available. Please note: This kit does not include the right side caliper and is designed for XL models originally fitted with twin front discs!

204015: Performance air filter designed for the Harley Davidson XL883 / XL1200 models. The 65 mm diameter tubular stainless steel elbow is produced by a unique patented process that allows the use of thin walled lightweight (only 305 gr) construction. The kit includes a well proven Sprint Filter (Water repellent) ‘Cone’ air filter, black finished tubular elbow manifold, crankcase breather pipes and required fittings. For this kit spare parts are available.


205707: Kit with 4 piston Brembo calipers and mounting bracket (Available anodized black). Increases braking power and modulation. Only for disc with 292 mm diameter (11"1/2 Inch). For this kit spare parts are available. Part for Harley Davidson Sportster XL.

206910: Multi adjstable billet aluminium CNC machined rearset footrest kit specifically designed to fit the Harley Davidson Sportster (2004 on). Superbly manufactured and available in either black or silver anodised finish. This feature adjustable footrest position via eccentric footpeg mount. Gear linkage gives more precise shifting. Includes nre brake fluid reservoir and Brembo master cylinder. No more scraping around corners with these fitted!

207600: This light weight pulley replaces stock, made of aluminium billet drive pulley temperate and surface hardened. Special steel galvanised inner part changeable totally stainless, reduced weight at 680 gr. This 29 teeth pulley can be used to increase speed on Harley Davidson XL Sportster 883 2004-2013 and XR1200. Using the original belt.

207665: The Tensioner is developed primarily to dampen the belt tensions in deceleration and stress to the wheel bearings and the pinion, maintaining a constant pressure. This particular model is obligatory where you want to lift up the rear, because the increased inclination of the swingarm, generates (inevitably) a difference in dimensional between the belt drive and swingarm extension, only compensated with a bending of the lower branch to belt drive that balances during the excursion of the swingarm. The aim is to extend the life of the belt and the wheel bearings and gearbox, as well as facilitating the smoothness of the secondary transmission and reducing the excessive tension. Maintenance free belt tensioner. For reasons of space it is necessary to modify the exhaust system and the rear brake master cylinder position.

208506: This new engine protector crash pad has been designed to dissipate/disperse the power of a collision over a wider area and to more points, so avoiding stress at one point (This product has been tested during racing!). Supplied with fitting hardware and available in black, silver or red anodised finish. Part for Harley Davidson XL Sportster. Spare parts are available if required. (Discontinued)


208925: This simple bracket relocates the OEM or aftermarket mirror under the handlebar for a more aggressive and uncluttered look. Supplied as a pair in black anodised aluminium with stainless steel fittings.

209015: Dashboard plate for Harley Davidson XL Sportster 06 up fuel injection models. Utilises the original speedo, with new billet aluminium surround/bracket incorporating the original warning lights. This model replaces the original bracket for use with original handlebar risers. Supplied with full instructions and everything needed for installation.


209813: Lightweight CNC machined billet aluminium designed to attach to front forks of XR1200X in order change the location of the original turn signals, or aftermarket with M8 thread. Fits all 56 mm diameter fork. Two piece clamps can be fitted without removing triple trees! Available anodized black only.


The primary is open. Built originally for racing use with our Buell and due to the experience established, we made it also for this Harley Davidson Sportster 883. To mount it, we open completely the crankcase with purpose of seal the left case (close the bottom hole “primary-gearbox” plus the hole that hold the two shaft of the shifter forks), and make a hole to drain oil from gear box. Obviously we replace all original bearing with sealed one. It’s also necessary to replace with a sealed ball-bearing the original shifter drum bushing, while we do this we also replace the right bushing that will make the shift gear easier and smoother. With this modification, not only we reduce drastically inertial mass but we can also use a good quality oil on the gearbox without that it get ruined by the dust of the friction plate.

In collaboration with Civico 10, the Pordenone based shop, workshop and garage specialised in Milwaukee based company's bikes and twins, the engine has been increased to 90 inches (which means 1470 cm3). Surely, the Sportster gains some more hp, but the most important thing is that the sports behaviour is enhanced.

A new 2 in 1 exhaust system, specifically produced inside Free Spirits laboratory. It foreseen a 1 mm stainless steel header pipes and a titanium muffler. The headers have a particular shape: they look like a person on his knee who is embracing the engine, or even supporting it. It is almost poetic!

The rear has been risen with risers-block and absorbers by Bitubo, to get a cafe racer geometry.The rear fork is CNC machined worked part (still a prototype), specifically realised to host a 200 mm tyre. It is really a good looking at a glance. With this new swingarm, it was necessary to reduce the stress on belt transmission realign fulcrum, pinion and hub with a belt puller.

harley davidson sportster xl 90 thunderstorm harley davidson sportster xl 90 thunderstorm