BMW

MODIFICATIONS TO MY R1100RS

Screens
GS "Tubes"
Melvin Hunter Custom Seat
Solid Handlebar Mounts
Fairing Mounted Mirrors
E=MC "Endurance" Shocks

The First UK R11xxRS Rideout

Screens

There are a number of screens available for the R1100RS. Although there are "economy" versions from suppliers like Motor Works and Moto-Bins (in the UK), the premium choices, at least to me, seemed to be the Wudo, the Aeroflow and the Parabellum.

I rejected the Parabellum as being too ugly but many people rate it highly. The Aeroflow has many fans and is probably the best looking. It is also available in the UK from Calamander if you are not a fan of internet shopping. It is however only 2.5mm thick not the 4mm of the Wudo and the standard screen. Its price of £104 in the UK is also a little steep. Although users of the Aeroflow rate it highly (I believe it pre-dates the Wudo) it cannot be used in the more upright positions at speed.


(Click on the images for a larger version)

The first picture shows the standard screen, the second the Wudo. Despite my poor scans (better pics to follow), the Wudo is considerably less tinted than the standard. Although not a great deal taller, it is the increased width at the top which makes a lot of difference when riding. The Wudo screen is not available in the UK however, Christopher Salzmann at Wudo in Germany speaks excellent English. They can be found at
www.wuedo.de (note the spelling). Although the site has an "English" button it is not working as at 29/12/01. You can get part numbers etc from www.wudo.com which is Cascade BMW in the USA. For a UK buyer, the prices will be much better from Germany. I paid £64 including shipping compared with a quote of $128 + $29 shipping from the states. Of course the price may rise or fall depending on what happens to the Euro after January 2002 but that's another story.

Fitting is simple, the screen uses the existing screws and lines up perfectly. For those of us who are less than fastidious about motorcycle cleanliness, it is important to clean behind the screen as the mounting plate and top of the fairing are clearly visible behind the fairly light tint of the screen. Despite the fact that you do not look through the screen while riding, I prefer the translucency of the Wudo to the opaque nature of the standard screen. It simply looks more "right" in my opinion.

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GS "Tubes"

This is the "must have" easy win modification for the R1100RS owner. It involves simply replacing the air intake trunking from the airbox to the throttle bodies with the parts from an R1100GS. The whole job takes less than 15 minutes unless you re-synch the throttles - not absolutely necessary but a good practice. All you have to do is loosen the jubilee clips holding the throttle bodies to the trunking, pull off the existing intakes and replace with the longer, narrower GS intakes, feeding them into the airbox in the process. Parts (from Motorworks part no POA00010) cost £21.15 (Inc VAT but Exc Delivery). Motorworks describe it as "R1100RS/RT Torque Upgrade.

The effect on the bike is impressive. At a cost in top end speed (which I don't think anyone has recorded), you gain a significant increase in "urge" in the midrange. In general, rideability is improved all round, especially in the "real life" rev range of 3,000 - 5,000 rpm. Another benefit is in town riding where the "shut off" on a closed throttle is much less pronounced making it much easier to ride smoothly.

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Melvin Hunter Custom Seat

The standard seat on the RS is fairly comfortable for most people and the three step height adjustment provides enought range to get your feet down at rest whatever your inside leg (inseam). Like most things however it can be improved and there are a number of options for the discerning rider. The Corbin and the Sargent seem popular but at over £500 they are not for the faint of wallet !

I had put replacment seats on the lottery winning list until I saw a mate's Pan European with a custom seat made by Melvin Hunter at Custom Motorcycle Seats in Coventry. Once I was told that his quality was good, prices reasonable and customer service impeccable, I was hooked.


(Click on the images for a larger version)

I spoke to Melvin the following day and was quoted £180 including contrast piping and a "gelastic" insert for the rider section. The only catch was that he works from an existing seat and I need my bike for the daily grind to work. A quick call to James Sherlocks found a secondhand seat at £35 for the front and £25 for the rear including VAT and delivery. Another hit on the plastic and the seat is despatched directly to Melvin "sight unseen". This way of course I get to keep my "classic/rare" Teal Blue seat in the vain hope that one day it will make me a fortune on eBay !!!

A week later my new seat arrives. It looks gorgeous. The front section slots in nicely but the rear will not latch into place. After some close comparison, there is a "eureka moment" when we remember that fitting the topbox support rails to the rack involved cutting down the underside of the rear section to fit. Two minutes with a Stanley knife and we're "good to go"

On my first trip to Ashford (just over 100 miles), I was somewhat underwhelmed. The seat felt nice and firm but after about an hour I had the usual pains in the cheeks. It was however vey cold (just before 6am - first frosts) and I think the gelastic may have been unable to mould to my shape. The return journey was considerably better and the seat now really lives up to expectations. It looks great and is only subtly reshaped so it doesn't alter the look of the bike too much. It's much more comfortable than stock and best of all, it doesn't break the bank.



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Solid Handlebar Mounts

Solid "billet" handlebar mounts to replace the standard "metalastic" mounts are a hotly debated topic on the R1100RS/R1150RS website
some contributors like the perception of increased "tautness", while others find that the increase in vibration is unnaceptable. Fitting is fairly easy although a long extension helps when fitting the lower bolt.

(Click on the images for a larger version)

Personally, I consider the solid mounts an excellent mod. They are machined in an "8" shape out of billet aluminium and are available from the "usual suspects", Verholen, Wudo and a number of places in the USA. I bought mine secondhand from a "K bike" rider in the UK BMW club and paid £25 (if memory serves). Not only do they make the bike feel as though it is handling better, they also make the bike much easier to wheel about and put on and off the centrestand. To my mind, there is no real increase in vibration but that may simply be because I am insensitive !

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Fairing Mirrors

The standard handlebar mirrors vibrate at speed and are too small for many people. The shape is not in keeping with the rest of the bike, and one alternative is to replace them with the K1200RS mirrors. These however remain on the handlebars. Wudo and Motorworks (see above) have some nice fairing mirrors but these are not cheap (Motorworks £180 pr). I felt certain that at least one other faired bike out there must have suitable mirrors so I set to search.

I am certain that the mirrors from a Triumph 955i Daytona would be ideal (the TT600 seem the same). However these are in the region of £70 a pair. For the dedicated cheapskate, Hein Gericke have the answer. They supply a range of mirrors for Japanese bikes. Part numbers 24000508 & 24000509 are pattern mirrors for the Kawasaki ZXR400/750 and cost £11.95 each (inc VAT).


(Click on the images for a larger version)

Once the dashboard panels are removed, two quick holes and "Robert's your fathers sibling". However if you look carefully at the front view pictures, you will see the blanking plugs where my first attempt was badly located. Although the position of the mirrors appeared fine, I had not allowed for the lack of articulation on the "ball" fitting when used at an angle it was not intended for. Remember on the Kawasaki, as on many other bikes, the mirrors are on the side of the fairing not the front. My second attempt was much more sensible although it did require the shortening of the "outer" mounting screw with a hacksaw.

Overall the bike is a few inches narrower which makes a difference in getting the bike through my gate and in London traffic. My elbows are just visible but I feel I get the best compromise between view and width in town (where a 360 degree swivel and eyes in the back of the head are more useful anyway). On the open road they can swivel outwards for maximum rear vision.


(Click on the images for a larger version)

Although the FZR mirrors did the job, the offer of a pair of slightly scratched Yamaha R1 mirrors was too good to turn down. The longer arms (and generally higher quality ) make them an even better choice. Fortunately, as the third picture shows, they fitted perfectly into the first set of holes. As they are wider, they provide a much better rear view, and the "snap back" feature means that they can be folded in to clear my garden gate. An added bonus is that the bike's cover fits again when they are folded back.

At idle they vibrate like no other, but smooth out as you pull away. They are fine at speeds up to about 70-80mph but blur slightly above that. In the centre lane of a motorway, both the other lanes are fully visible and there are no apparent blind spots. On the R1, they are supported by a fairing stay which bolts to the back of the mirrors. The next stage is to add a "meccano" type steel plate behind the fairing which should increase rigidity. Until someone offers me a free pair of R1100S mirrors, these will do the trick.


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E=MC "Endurance" Shocks

Received wisdom suggests that the shock absorbers are the weak link in the R1100RS suspension setup. At 50,000 miles, it became clear that I needed to replace the shocks on my RS. Research pointed to the Ohlins, or possibly Fournales as the premium choice with Hagons as an economical alternative. There are two problems with the Ohlins. One is that they are hideously expensive. In the UK, a pair work out at £720. This is a result of there being far too many middlemen in the spully chain. A further problem is the supply situation. When I ordered from Motorworks, I was quoted 12 weeks for delivery. The Fournales have no supply problems and are about the same price as the Ohlins. They are oleopneumatic (air) shocks and therefore need a special pump for adjustments. Hagons are much cheaper at £468 for a pair (and British !!), but advice I received suggested that they are "built to a price".

Despite having the Ohlins on order, I continued to search for shocks. A friend manged to find a leaflet from an old Ally Pally racing show for French made E=MC Endurance shocks. After I tracked down Tim Rose of T.R.Engineering, the importers (01933 229670/07970 684816), I decided that here were my economical alternatives to the Ohlins.

At £235 each plus £25 for Tim's "assisted DIY" fitting and setup, the price was right and Tim's obvious expertise over the phone lead me to conclude that even if the Ohlins were of a slightly better quality, properly set-up E=MCs would leave the bike handling better than badly set-up Ohlins. Tim also suggested an 18mm "hike" on the rear to sharpen the handling without upsetting the high speed stability. Delivery was quoted as one week but it turned out to be nearer three - a bank holiday in France being the culprit.

Fitting was remarkably simple. The rear wheel does not need to be removed completely, just unbolted and moved backwards about six inches. However, in order to completely remove the top bolt, one of the seat height brackets has to be unbolted but this is hardly a major job. The photo also shows the "self aligning" bush which is also found on the bottom of the front shock. At the front, things are also easy. The fuel tank needs to be moved back slightly to reveal the top mount and it was necessary to jack under the engine to drop the telelever arm (wishbone) to allow the shock to be eased out.

With everything bolted back together, the static sag was measured and set using the spring preload adjustment. Correct sag should be 25 - 35mm at the rear and 8 - 15mm at the front. After a quick ride, I found that the bike felt much more "planted" at any speed. It rolls into slow corners in a much smoother manner and the bike was entirely stable hauling down from high speed with the ABS thumping like a hammer drill. It did however feel slightly harsh at first but 1 turn on the infinitely variable screw cured that immediately.

The shocks appear to be constructed extremely well, with blue springs, a single combined compression/rebound damping adjuster and neat preload rings. The damper rod is titanium nitrided and this should protect it from the rigours of the road.


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