Aprilia RXV Rally

This is in fact the “Rally Bike build” part two, my new Aprilia RXV 550 makeover.

In the last few Dakar Rally’s the only serious opponent for the dominant KTM bikes were the two cylinder Aprilia’s.  In fact some say the engine of the Aprilia is the only 450cc engine which will last a complete Dakar, and on top of that it is more powerful than the single cylinder KTM. Rumors are that KTM is lobbying with A.S.O. to allow only single cylinder engines to compete in the Dakar. This would proof the superiority of this unique engine. Unfortunately the Aprilia off road sales department is not as successful as KTM and therefore there is no budget to invest in Dakar anymore. There top pilot Francisco “Chaleco” López Contardo signed at a brand new Italian team called Bordone Ferrari. His results in le Dakar on the Aprilia were 3-rd overall in 2010 and 4-th place in 2011. In 2012, his last year on the Aprilia, he crashed on the stage 7 and was out of the race.

Blog1

My choice for the Aprilia RXV is purely based on the engine and because I will not compete in Dakar I didn’t need to be limited to 450cc and went for the 550cc engine. Aprilia off road has stopped producing the 550cc and I got the last version of this model, recognizable by the red frame. Aprilia sells their factory rally replica bike engineered by the Aprilia Racing department complete or as a conversion as a kit, which specialist companies like Giofil in Italy and Behego in The Netherlands have used to convert standard Aprilia RXV 450’s into rally bikes. This kit will set you back EUR 16.000,- (excluding labor and the donor bike) A complete bike costs EUR 37.000,- I decided to make the rally conversion myself.

For smaller rally’s I want to keep the bike light and will not need the extra fuel capacity of the Dakar kit. All I’ll do is swap the standard fuel tank for a larger 12 liter (3 gallon) one. This way I can use the standard exhaust and rear frame. Downside is the limited autonomy of only 125 kilometers (about 75 miles) in competition. The front of the bike is very similar to the Factory bike because of the necessity of the same navigation equipment. In order to be able to read from your roadbook holder and tripmeter, both have to be placed high up on the navigation tower behind a proper fairing.  I was able to get my hands on an original fairing which was used in the Dakar 2011, refurbished it and took a mould. Now I can make my own.

First things on my list were the modifications: new wiring loop and the welding of the frame. The welding I commissioned to a specialized company called Lameier Photowelding here in Belgium. The new wiring was necessary in order to relocate the ECU and power regulator to the navigation tower. They were on top of the airbox not leaving enough space to change the airfilter properly. I placed them high up in the navigation tower together with the fuse box and horn which were also moved from their original position.

Untitled-1 copy

I designed and fabricated the navigation tower with the original Aprilia rally bike as an example. In order to have maximum flexibility during the design process I used 4mm plywood for the prototype. After I had figured out the exact and best position of all the attached parts, I used the plywood plates as a mould for the final aluminum plates.

blog 4

The Aprilia RXV is quite an exclusive bike and as a result there almost no special parts suppliers available. I used several parts from Meca’Systems in France, one of the few companies which make some aftermarket parts for the Aprilia RXV.  I have found some compatible components designed for other bikes which will fit to my bike as well. For a larger front brake disc I used a Yamaha bracket (which also has Nissin calipers) from Braking. The navigation tower is held by two adapter plates from KTM and the BRP submount for the steering stabilizer is for a Honda which has the same top triple. I also used a Ducati oil cooler and a replica of a KTM rally front fender.

With a little help from the internet and creative thinking of some suppliers, I managed to get almost everything I needed for the conversion. Only the pin which carries the fairing had to be machined out of a piece of aluminum. The headlight brackets and light protectors are also handcrafted, all the rest is “of the shelve”. Here is the final result:

Aprilia 2

What about performance? My RXV was tuned “fully open” by the Aprilia dealership at 78 BHP and has a secondary transmission of 15/50. A 14-tooth front sprocket is supplied with the bike but I won’t use it. With the 15-tooth sprocket at 100 km/h (60 mph) the engine speed is 6.850 RPM… I swapped the 50T rear sprocket for a 46T and now it’s running “only” 6100 RPM at 100km/h.  The Dakar 450 bikes run 15/48 BTW. Downside of this high performance engine is the poor fuel economy, from a full (12 liter) tank I could only manage to get 135km of range off-road, with 0,6 liter left in the tank. This is 30% more than the 690!!

Aprilia 1

Aprilia 3

This summer I added a Baja Designs KTM EXC 5 liter auxiliary rear fuel tank. With some modifications to the rear frame (cutting off a piece of the sub frame and welding a special made aluminum bracket to hold the tank) I managed to fix it to the rear of the RXV nicely, modifying the plastic of the side panel and rear fender. It’s the same width as the exhaust and very lightweight, so I barely notice it even when it’s full. Now the autonomy is about 185 km which is enough for most Rally’s (>150km)

I simply connected the outlet of the auxiliary tank to the air vent of the primary fuel tank. This way an extra fuel pump is not required, you make sure the extra 5 liters are fully used and you get rid of the extra weight right away! The pump is strong enough to suck a strong enough vacuum to empty the rear tank, no problem: It has worked for 1600km now!

Blogfoto copy

Advertisements

20 responses

  1. david

    sell the kit just for parts or sell the whole kit and have some contact email

    April 2, 2013 at 03:21

    • I don’t understand your comment or question, please explain.

      April 2, 2013 at 16:27

  2. patrick

    Frank heb jij nog rally delen van die RXV?
    kuip, toren etc…

    gr
    Patrick (patrick2wd op t allroadmaniacs forum)

    October 26, 2013 at 08:58

  3. Mitja Japelj

    Very very nice!!! I would like to contact you for more details about the modification of the Aprilia that you have done.

    November 10, 2013 at 12:09

    • No problem, I’ll be happy to help you.

      Cheers,

      Frank

      November 10, 2013 at 18:06

      • Mitja Japelj

        I’m interestet in the same modification for my RXV 450. Is it possible to somehow get the fairing?

        Regards,

        Mitja

        November 11, 2013 at 16:37

      • Hi Mitja, I’m afraid that is a difficult one.. I made a deal with someone who knew the owner of a 2011 Dakar bike to make a mold of the fairing. The deal was that I would make the mold for him and I would have one fairing for myself. The mold is gone now but is wasn’t good at all. The fairing has a very difficult shape. The pieces I was able to make from it I had to finish off by hand which took a lot of hours..

        A real headache, same as the wiring loop, the welding of the frame, the headlights and recently I finished a 5 liter rear auxiliairy fuel tank.

        But it’s worth it, The RXV550 is the best bike I have ever owned!

        Can’t help you with a fairing I’m afraid.

        Cheers,

        Frank

        November 11, 2013 at 17:06

      • Mitja Japelj

        I understand. Thank you for help. Can you post some pics of rear tank?

        Regards

        November 11, 2013 at 17:11

      • I added some pictures of the rear tank to the Aprilia post on my Rally blog.

        Cheers,

        Frank

        November 12, 2013 at 11:42

  4. patrick

    of andere delen…

    November 10, 2013 at 19:20

    • wel een deel van het plastic, de 8L tank, carterbescherming, stuurschakelaars, en het rode zadel als je dat bedoeld.

      November 10, 2013 at 23:36

      • patrick

        Kan je mij fotos mailen van die carterbescherming, een met zon tankje erbij? Of…?
        En welke stuurschakelaars van ico enz?
        Laat maar weten.. gr Patrick

        November 11, 2013 at 02:07

      • Een aantal dingen zijn te zien op deze foto: tank met stickers, radiatorkappen, zadel met tasje, vorkbeschermers, carterbeschermer in kunststof met koelwatertankje, lichtschakelaar stuur links, richtingaanwijzers voor, verlengd achterscherm met richtingaanwijzers, dat soort dingen.

        Stuur me even je email adres, dat is makkelijker als je foto’s wilt hebben.

        groet,

        Frank

        November 11, 2013 at 11:12

  5. patrick

    even zo dat het niet herkend wordt door een spambot:

    sail_dude {at} hotmail punt kom

    November 11, 2013 at 16:25

  6. Scott

    Any chance you can be more specific on the front brake caliper and bracket you used? Thx

    August 26, 2015 at 08:10

    • Yes of course, its a Yamaha rally bracket from Motomaster for the standard Nissin caliper. Then you can use a large Braking disk:

      http://www.amazon.com/Moto-Master-211023-Supermotard-Adapter-Bracket/dp/B0051TFX8Y

      August 26, 2015 at 10:36

      • Scott

        Ok, so what did you use for a caliper? Size? Also what is the spacing bolt pattern? I can’t seem to find it anywhere? I have been searching, but it seems all I can find is a 320mm, which I have been told is actually a 267mm. Can you say confused .
        Thx Scott

        August 29, 2015 at 07:14

      • Patrick is right, you only need the 320mm disk and MotoMaster adaptor and you can bolt it together using you standard RXV caliper from Nissin. Cheers, Frank

        August 29, 2015 at 10:31

      • patrick

        Check de rxv thread on the http://www.apriliaforum.com/
        Plenty of info, including my 320 front end rebuild…

        August 29, 2015 at 11:17

      • patrick

        Check ebay .de
        There is a guy offering a turn-key ready to fit adapter.
        Buy a 320 disk of a supermoto rxv put both together and you have a 320 disk on your rxv.
        Also check apriliaforum.com, us site with heaps of info….
        Goodluck
        Patrick(2wd)

        August 29, 2015 at 09:26

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s