Posted on 31 May 2026 by Archie van Creij — Leave a comment

Vortex V4 aluminum sprockets.

Vortex V4 sprockets: maximum performance for both street and track

For motorcyclists who want to get the most out of their drivetrain, Vortex Racing’s V4 sprockets were developed with one goal: better performance without sacrificing reliability. With an updated lightweight design, high-quality materials and race-oriented engineering, Vortex V4 sprockets offer an instant upgrade for sporty street riders and track enthusiasts alike.

Lighter, stronger and faster

The V4 series is the latest generation of sprockets from Vortex Racing. An optimized design reduces rotating weight, resulting in faster throttle response and a more direct feel when accelerating. Less mass in the driveline means the engine builds up revs faster and transfers power to the rear wheel more efficiently.

Designed for performance

Vortex has decades of experience in motorsports and incorporates that knowledge directly into the V4 series. The sprockets are precisely manufactured to ensure perfect concentricity and optimal power transmission. This not only provides better performance, but also a smoother riding experience and less chain and drivetrain wear.

Ideal for a 520 conversion

The V4 rear sprockets are designed specifically for 520-pitch applications, a popular choice among sporty riders because of the weight savings over standard configurations. A lighter chain and sprocket set contributes to sharper handling and improved acceleration, especially noticeable during sport riding and track use.

Various gears and colors

Whether you are looking for more acceleration, a better balance between pulling power and top speed or a unique look for your bike, the Vortex V4 series is available in a variety of tooth configurations and anodized colors. This allows you to tailor your drivetrain completely to your riding style and motorcycle.

Why choose Vortex V4?

Lightweight racing design for improved performance
Faster throttle response thanks to less rotating mass
High quality aluminum construction
Precise production for optimal concentricity
Suitable for street, sports and track use
Available in various colors and serrations
Based on years of experience in motorsports

Upgrade your powertrain

With a Vortex V4 sprocket, you choose a proven performance upgrade that is immediately noticeable while riding. Whether you want to accelerate faster out of corners, are considering a 520 conversion or simply want to get the best out of your bike, the V4 Series delivers the performance and quality that Vortex Racing is known for around the world.

Posted on 10 November 202318 April 2026 by Archie van Creij

Barnett clutch spring conversion kits

Clutch spring conversion kits from Barnett clutches are the solution to clutch problems on a number of Yamaha motorcycles. Yamaha has equipped some of its models with a clutch equipped with a diaphragm spring. In practice, this system does not seem to work completely flawlessly. This makes the clutch more difficult to operate and sometimes shows very rapid wear of the clutch plates.

Barnett clutch spring conversion kits consist of a new milled pressure plate fitted with a number of traditional clutch springs. Below is an example of this.

Barnett clutch conversion

Less wear and a much more manageable coupling is the result of installing this conversion kit. A relatively simple adjustment with great results.

This clutch spring conversion kit is available for the following Yamaha motorcycles:

YZF-R1 1998-2003
FJ 1100 en FJ 1200
FJR 1300
V-Max 1200
XTZ 1200 Super Tenere
MT-01
XV 1600
Road Star, Royal Star XV 1700
Raider, Roadliner en Stratoliner XV 1900

The different conversion kits can be found on our website

Posted on 6 November 202218 April 2026 by Archie van Creij

Vortex V3 2.0 chain

Vortex chain V3 2.0 in gold and in black

Vortex racing has designed a new chain. This motorcycle chain is available in black and in gold color and has the trusted Vortex quality and finish.

Specifications of the chains are:

– x-ring quality chains

– Available in SX3 quality (strong) and RX3 (super strong)

– Available in different lengths

– available in chain widths: 520, 525 and 530

– provided with locking pins with a hollow end, are therefore easy to rivet

These chains are suitable for most modern engines. Check out our website or contact us for more personal advice!

Sales price from € 121,00 including VAT.

Posted on 16 March 202218 April 2026 by Archie van Creij

Oberon Performance Clutch Slave Cylinders

Clutch Slave Cylinders from Oberon Performance are a nice upgrade for those motorcycles that have a hydraulic clutch. Often this works great but there are also regular problems.

The original slave cylinder (comes with the engine block) doesn’t always work fine and dosage and there are also several that regularly break down, making the clutch not easy to operate. An additional problem is that the original cylinders are often quite expensive.

Solution for this are the Clutch Slave Cylinders of Oberon Performance.

These come with a lifetime warranty (in practice, they hardly ever break down) and with an optimal matching of the parts to the engine. This will in many cases make the clutch work finer and more controllable.

On our website, these can be found and ordered of course. A small repair with subsequent great driving pleasure.

Posted on 10 March 202218 April 2026 by Archie van Creij

Chain riveting…. do it yourself

Chain riveting is possible? Yes, of course you can. however, we recommend using a suitable chain punch for locking links with a hollow pin (e.g. DID, but also most other brands use this system).

Below is an example of a chain punch and a picture of a locking link with x-rings and chain grease

Chain tool in parts:

Chain Punch A : A
Chain Punch B : B
Anvil: C
Punching pin: D

My tip is not to use the chain punch to break the old chain, pin breaks then quite easily, you can simply divide the old chain using a grinder.

Fit the rivet link with the o-ring or x-ring rubbers in the prescribed manner (use the chain grease supplied) and finally fit the striker plate as shown above. I have used a different color locking plate for clarity in the photo.

Take the chain tool part B and place it behind the chain, the pins of the link are in the recesses of chain tool part B.

Insert the pin (part D) into chain punch part A with the thin pin facing inwards, so that the widest part still protrudes a little. Take the anvil (part B) and slide it over the chain punch part B. Make sure that the anvil falls exactly over the locking plate of the rivet link, see the picture below. Tighten slowly by hand so that everything is properly clamped.

You use two wrenches to tighten the punch until it can go no further. Check in the meantime that the locking plate goes straight over the pins). When the punch can’t go any further, the locking plate has been pushed far enough over the pins (can’t go too far!).

As a final step of the chain riveting process, the pins must be “punched”. To do this, remove the anvil (part C). Now position the upper part of the chain punch (part A) so that the pin with the notch is exactly on the locking pin. Tighten the chain punch again by hand and check that it is exactly straight.

Then use 2 wrenches to tighten the punch until it cannot be tightened any further. I recommend checking in between to see if the locking pin is evenly “bent”. Repeat this with the^second pin. You then have the chain nicely riveted without it being too “tight”.

Then make sure you have a good maintenance so you can enjoy your new chain as long as possible. Use a good quality chain spray (spray every 250 to 500 km, note: do this after a ride on a warm chain). Of course you can also choose for convenience and mount a (fully automatic) chain lubrication system.

Are you looking for a good chain set for a competitive price? Have a look at our site to see which set we can supply for your bike.

Posted on 28 August 202118 April 2026 by Archie van Creij

DPNS raceparts

DPNS raceparts is a Dutch company specialized in the design and manufacture of high-tech aluminum parts for motorcycles. Often used by circuit racers.

DPNS raceparts makes rear sets, gas caps and yokes for the well-known brands. This mainly for Honda, Yamaha, Suzuki, BMW and Ducati.

All parts are milled from the highest quality aluminum and color anodized.

Rearset

DPNS rear sets are suitable for normal and reverse shifting. All parts are easy to replace and of course available separately.

Fit is great, each part is specifically designed for the model of bike.

Gas caps

The gas caps of DPNS Raceparts are available for the most driven motorcycles on the circuit.

Available for Ducati, BMW, Yamaha and Suzuki among others.

Top Yokes

There is a replacement yoke for the Ducati Panigale and Panigale S. Super strong and light of course.

For all parts, quality and function is the most important at DPNS Raceparts.

Posted on 5 August 202018 April 2026 by Archie van Creij

Akrapovic mufflers and systems

Akrapovic history

Akrapovic exhaust mufflers. Akrapovic is a manufacturer of high quality mufflers and exhaust systems for motorcycles and cars. The company is based in Slovenia. In 1977 Igor Akrapovič started racing, however he was not satisfied with the quality of the exhaust systems available at that time in the Eastern Bloc countries and the exhaust systems from the “West” were simply too expensive.

He started a small company where they made their own exhaust systems. This company started with the name Skorpion. In 1993 Kawasaki began testing these exhaust systems in Germany and in 1994 they were used for the first time in international competitions including ESBK and WSBK. After that several other Superbike teams like Yamaha, Suzuki, Ducati and Honda started using these exhausts.

In 1997, the name of the company was changed to Akrapovic. After sales had risen sharply, especially in Germany, the production capacity was greatly increased in 1999. For this purpose the company moved to a larger production location. The 450m2 workshop was exchanged for a 3000m2 workshop in Ivančna Gorica. The workshop at this location has since been expanded to 13,000 m2 in 2010.

Akrapovic logo

In 2000, the first WSBK world championship was won by Colin Edwards on the Castrol Honda SP-1. Technical developments continued and in other competitions, Akrapovic exhausts were increasingly used until the MotoGP.

Akrapovic mufflers and systems at Bunkerparts

We have been supplying the exhausts and exhaust systems of this top brand almost from the start of our company in 2004. All these years the quality of the stuff has been absolutely top notch. These are characterized by a very sporty sound (even in the versions with E-approval!), more power, more tractive force and a lower weight. The workmanship and attention to delivery are always complete.

akrapovic bmw f 900 xr carbon — Akrapovic slip-on BMW F 900 XR

Akrapovic exhaust mufflers and systems are definitely in the top segment. Especially the Evolution systems with full titanium exhaust pipes are widely used in the racing world. But also for the “ordinary” street rider the brand has very nice products. Very popular at the moment are the systems for the Yamaha MT-09, the MT-07 and BMW S1000RR and the silencers for the new Kawasaki Z900 and the BMW R1250 GS.

So if you are looking for a top end muffler or exhaust system for your bike, you can stop searching, check our site to see what Akrapovic has to offer for your bike or contact us. We supply the total motorcycle program at competitive prices!

Akrapovic yamaha r1 2020 uitlaatsysteem evolution line — Evolution line titanium exhaust system R1 2020

Posted on 8 February 202018 April 2026 by Archie van Creij

Evotech Performance accessories BMW R1250GS and Adventure

Evotech Performance has developed a nice line of high quality accessories for the BMW R 1250 GS and R 1250 GS Adventure. From Radiator Guard to Navigation Mount. These accessories are a very nice upgrade for your motorcycle.

Evotech Performance Radiator Guards are made from aircraft aluminum and finished with a durable black powder coating. Features Hexagonal holes for proper airflow with optimal protection. Very light weight with only 80 grams each! Mounting can be done on the original mounting points, for this a complete instruction is available. This instruction can be downloaded from the manufacturer’s site.

Evotech Performance spindle protectors (wheel axle protection) are equipped with a system that allows the crashpad to rotate in the wheel. This clearly improves the life span and degree of protection in case of a crash. The end crash pads are milled from aluminum and have a durable black powder coat finish. These spindles provide good protection for the swing arm and calipers in case of a fall.

Evotech Performance Navigation Mount for Garmin mounts to the original mounting points of the windscreen mount. Milled from aluminium and provided with a durable black powder coating. Compatible with all Zumo models from Zumo 220 to Zumo 760LM These are some examples of accessories for these bikes, Evotech Performance also provides engine block protection, hand guards and more.