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The 2011 season marked an exciting time for BMW Motorrad Motorsport WSBK team. After an encouraging debut season in 2009, where the team achieved 17 top 10 finishes, followed by a first pole position and podium in 2010, 2011 was going to be the year that the team could concentrate on racing for more podiums and perhaps an ambitious win…

Rainer Baumel, previously technical director, moved into the role of Head Of Race Operations, while Stephan Fischer became Head Of Development and logistics, personnel, finance and responsibility for the race factory was placed in the hands of alpha Racing Manager Josef Hofmann.

There were extensive changes to the machine for 2011. The engine specifications were dramatically altered to give more mid-range power, evident by the use of a new shorter exhaust pipe. But maximum power was increased to 220RWHP. The year began with specification engine number nine and spec 10 was introduced mid season. The goal was to increase top end without losing mid range. This was achieved and saw a 5hp increase.

However, maximum power is not the only criterion in WSBK, with throttle response being equally important. The BMW S 1000 RR throttle-bodies are controlled by a ride-by-wire system that was continually developed throughout the season. It is controlled by an RSM5 management system, developed in-house by BMW Motorrad Motorsport.

Chassis-wise, there was also a lot changed for 2011. The weight distribution of the bike was optimised with the seating position of the rider shifted back to increase weight over the rear of the bike. The fuel tank was also new, as was the rear sub-frame and new Ohlins TRSP25 forks were used. Also, interestingly, a cast rear swingarm replaced the previous fabricated swingarm. Lastly, new livery was added to the carbon-fibre fairings to make bike look more like the limited edition blue and white road version. Nice touch…

THE RIDE
By the time I rode the BMW of hero Troy Corser, I’d already sampled the Althea Ducati, Yamaha, Alitalia Aprilia and a few 600s. So I was well and truly back in the groove on the track and the nerves had settled. As much as they can when riding a World Superbike!

The BMW Motorrad Motorsport pit set up was the most professional of the lot. It was incredibly clean and the team were really friendly. Fellow Speed TV WSBK face Steve Martin was hanging around so I had a chat with Steve about the bike he played such a big role in developing. Troy Corser popped in to the pit garage however I was not able to get a chance to chat to the two-time WSBK champ sadly.

Looking over the bike, the attention to detail is incredible. From the stunning Akropovic shorty four-into-one to the amazing and huge handmade radiator, the bike is incredibly perfect to the eye. Not a mark or a scratch and nothing looks like its worth anything under a million bucks.

I’d overheard a few fellow journalists complaining that the electronics on the bike were too intrusive, perhaps set too conservatively for some of us, so as the team fired up the bike I was a little concerned the ride might be less than the real deal – so far on the day every other team had left the bikes as raced, and showed us the data to prove that – and the settings they used.

The bike was fired up and I jumped on. The first thing that blew me away was just how tiny the machine is and how compact Troy must be! He’s no Marco Melandri midget but I was more cramped on Troy’s bike than on Marco’s, Checa’s, Rea’s or Biaggi’s machines.

The ‘bars are very traditionally positioned – wide, pulled back with an angle downwards. The levers are tiny and only for two-fingers. And the footpegs very, very narrow. The seating position feels way back over the rear wheel and despite the ride height in the bike; it feels rear biased and low. Overall, tiny. I felt like I was on a 250!

The engine idled over at a fast pace as I clicked up into first gear and headed off down pit lane with a fist full of revs to get moving in the tall first gear. The pit lane limiter kept me at 40km/h then automatically switched off as I exited onto the end of Portimao’s fast chute.

I was lucky again as I had new tyres. So I put my head down and started to push from turn three onwards. The peaky nature of the bike was immediately noticeable and it did not have the punch and throttle response off the turns that the other fours enjoy and nowhere near the Ducati. However, the throttle could be opened really early without torque tying the bike in knots – and the top-end acceleration was incredible. Much more than the Castrol Honda or the Yamaha and similar in feeling to the Alitalia Aprilia.

It was about now that I got into a rhythm and the electronics started to spoil my fun. At anything but close to upright the bike would cut ignition and fuel and splutter off the turns slower than a 600 supersport bike. In fact, the bike felt slower than the street bike in some instances. Off any of the first or second gear corners, right on apex when I started to pickup the throttle and feed some power in, the traction control would cut in and sometimes it almost caused me to crash when the bike did not react to the throttle and pick itself up to drive off the corner. To adapt I had to basically park it turn, stand it up and fire it off the corners. It was a shame as most of us there were experienced racers and should have been given the opportunity to ride the bikes as raced.

The only other theory s that Troy is carrying more speed and higher rpm at that lean angle and the TC is set to be less intrusive there – so I was not riding in the same rpm range as him, therefore the TC was misbehaving. However, after speaking with the other test riders, the experience was a common one apart from for the really slow guys that were not opening the throttle hard enough.

The handling of the bike was different to the other four-cylinder machines. Firstly, Troy has the set-up very stiff compared to all of the other superbikes. And as mentioned, you really feel like you are riding the rear wheel everywhere – whereas looking at the bike in 2009 and 2010 it looked very forward biased and Troy was a weapon at running it into corners blindingly fast.

With the narrow footpegs and tiny levers, I felt like I was slipping off the bike and I could not get the hang of the thumb rear brake – but I did make a point of trying it. I reckon once you got used to the mental mechanical action it would be brilliant.

Initial turn-in on the bike is brilliant. The steering light and agile and I could get the turning process done more quickly than I could on the other fours. There is a mix of braking turns and non braking turns at Portimao and the bike was great in both situations, turning with accuracy and speed and not much effort. However, I found that I had to put quite a lot of effort into keeping the BMW on its side through a turn, really using my outside knee to hold the bike down. On picking up the throttle for exit, the bike would snap and try to stand up. So running a long, accelerating line off a corner was difficult. It was a shame, as the lack of torque made the bike easiest to open the throttle early on and the chassis should not get upset so much without torque there to tie it in knots…

I think it was a combination of me not fitting in the seating position and having my 90kg at the time weight over the rear wheel, plus the aggressive nature of the engine in the higher rpm in some situations, that caused the reaction in the faster corners. In the slow corners I can’t explain it…

On the brakes the bike was extremely stable and the slipper clutch and back-shift system was brilliant. But with the thumb rear brake and stubby levers on the handlebars, the experience was different and would take some getting used to.

Acceleration down the front chute was definitely a thrill on the 220hp S 1000 RR as the electronics battled to keep the front wheel on the ground coming over the crest at 200-odd km/h before accelerating to close to 300 before the braking area. And experiencing how the electronics work was great, although it would have been more interesting if it was raining for example.

Overall I really enjoyed the ride but left thinking that the ASBK winning S 1000 RR of Glenn Allerton is a better handling package and I wonder how Troy would go on that if it had another 20hp…

BMW Motorrad Motorsport 2011 Season
Team Partner: alpha Racing
BMW Motorrad Motorsport Director: Bernhard Gobmeier
Head of Race Operations: Rainer Bäumel
Head of Development: Stephan Fischer
Managing Director Stephanskirchen: Josef Hofmann
Riders: Troy Corser, Leon Haslam
Crew Chief Troy Corser: Tom Larsen
Crew Chief Leon Haslam: Giacomo Guidotti

TROY CORSER – active WSBK 1992 – 2011.
Date of birth: 27th November 1971 in Wollongong
Place of residence: Monte Carlo
Nationality: Australian
Marital status: Married to Sam, two children: Kalani and Kelisa
Height: 1.70m
Weight: 68kg
Hobbies: Golf, wakeboarding, karting, jet ski, motocross
Passion: Racing
Favourite circuits: Phillip Island, Valencia, Portimão
First bike: Yamaha TY80, Honda CR80
First race: 1989 Australian Production Series 250cc
Career highlights: 1996 Superbike World Champion, 2005 Superbike World Champion
World Superbike record: 377 race starts, 130 podiums
33 wins, 47 seconds and 50 third places, 43 pole positions, 45 fastest laps

Troy Corser’s WorldSBK BMW S 1000 RR Specifications

Power: Over 220hp
Wet weight: 162kg
Fuel capacity: 23L

Engine: Liquid-cooled, inline four-cylinder, DOHC, 16-valve, four-stroke, Bore and stroke 80 x 49.7mm, 999cc, compression ratio: 14:1, fuel delivery: Dell’Orto fuel management system with 48mm throttle-bodies, gearbox: Six-speed cassette-style, clutch: wet multi-plate slipper clutch

Frame type: Twin-spar alloy frame with adjustable geometry
Wheelbase: Adjustable
Rake: Adjustable
Trail: Adjustable
Front suspension: Ohlins forks
Rear suspension: Ohlins TTX shock
Front brakes: Dual 320mm Brembo rotors with Brembo four-piston radial-mount monoblock calipers and radial-pull master-cylinder
Rear brake: Brembo
Front wheel: OZ Racing
Rear wheel: OZ Racing
Front tyre: Pirelli Slick, 120/70 – 16.5
Rear tyre: Pirelli Slick, 190/50 – 16.5 or 200/55 – 16.5
Instruments: BMW Racing

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So when the chance came up to ride the very last version of the famous and successful TZ250 I couldn’t say no and just quietly I was quite looking forward to it. This bike was a little special though, it had come directly from the Garage 4413 team who campaigned it to the runner-up slot in the All Japan 250cc Championship. The bike’s current owner, Harry Danilidis, purchased it from the team two years ago, straight after the Championship.

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Harry chose it simply because, in his own words, ‘it was a pure race bike and the last of its breed’. Harry’s passion for the bike is evident when he lets us know that it only did one season and was never crashed so therefore the spares kit is still full. It made me feel quite privileged to be given an open pit lane, a clear circuit and a brand new set of soft compound Bridgestone slicks to use as I saw fit.

On the technical side, the bike is a kitted TZ250-5KE and the final evolution of the original TZ250. In standard trim the bike puts out a claimed 93hp but with the addition of the kit that is boosted significantly to 105hp. The cylinders are factory items but the porting is done in-house by the team. A few other parts are sourced from ‘The Japanese Tuning House for Yamaha GP bikes’.

The ignition system is Yamaha along with the dry clutch and the factory exhausts. Trevor Lusby of Scott’s MC was our mechanic for the day and looks after the bike. He mixed the fuel at a fairly conservative fuel/oil mix for us journos and has jetted the bike slightly on the rich side just to be safe and taking into account the cool morning temperature.

I had previously ridden a GSX-R750 earlier in the day testing some Pirelli tyres and that is usually considered a pretty nimble bike in terms of the big four-strokes so when I jumped on the TZ and accelerated out onto the private circuit more affectionately known as ‘The Farm’ I knew I was on the right bike. Anyone who has ridden at The Farm will know that there is absolutely no rest and corner after corner that includes a five-changes-of-direction chicane to give a grand total of 29 corners. If there was any bike you would want under you while negotiating 29 corners per lap then this little Yamaha is the one.

As I wound up to speed and got used to the two-stroke again, the brakes were the first thing that took me by surprise with their incredible stopping power. The Nissin calipers give great feel and that coupled with the Bridgestone front tyre soon pushed aside any concerns I had of stopping without the assistance of the engine braking that I have come to rely on. I simply just squeezed the TZ’s brakes a little harder and never missed an apex all day.

I have to mention the Bridgestones that Trevor had fitted for me because from the moment I went out and got the bike on my knee, they gave me great confidence and feedback. The front actually seemed to get better and better the harder I pushed it and although the rear started to slide on the corner exits towards the end it was very predictable and a lot of fun. This was typical of a soft compound tyre getting a little hot and starting to move around a little.

The engine pulls from as low as 6-7000rpm exiting the slow turns but builds revs really quickly as I went up through the gears all the way to the shift point about 12,500rpm via the quickshifter. It flattened a little right at the top but as Trevor mentioned earlier this was due to him going on the rich side with the jetting. This also made it a little rough on initial opening from closed throttle at low rpm.

The real reminder that you are riding a true race bike comes when going back down through the gearbox. Rushing into one of the turns in fourth gear then banging it down all the way to first reminds you how easy and quickly this is done on a two-stroke. I went down three gears while braking really hard with the rear wheel barely touching the surface and there wasn’t the slightest unsettling from the rear during the downshifts.

Initially looking at the bike I assumed it would feel very cramped and small with the high footpegs but once I was on the bike and lapping I had plenty of space in the turns and no problem getting tucked in down the two straights.

The TZ gives the feeling and response that I remember chasing on the four-strokes for years. The little Yamaha turns in very easily without being unpredictable and comes into an apex time after time and holds its line on the exit because it steers on the throttle.

Finally I have to bring up the five-corner chicane again because on most bikes you would be thinking, oh no not again but on the TZ you finding yourself looking forward to reassuring yourself that it really is that easy. Sadly though, these pure race bikes were built for one reason and are destined for museums, parade laps and passionate collectors. Very few will have the opportunity to sample these thoroughbreds, which is a shame.

Jeffs Thoughts
I’ve wanted to ride a proper late model 250GP forever. Having raced 250 proddies for years and being part of a top running Honda team in Japan that ran 250 GP bikes (I was riding 600s and 1000s), I’ve always drooled over 250 GP machines. But a few things stopped me ever racing one – mainly money and my fat arse! 

The first thing that grabs me is the size. I’m 25kg heavier than I was last time I rode a 250… Once I squeezed in I was OK. And after the initial amount of clutch slip and rpm took me a second to get used to after so many years of four-stroke riding, I was off up the chute. The bike was hot and the tyres too so I wasted no time. I put my head down and ran the bike through to 12,500rpm. I like to do that – rather than ease into a shock of power just get the shock over with! Once I had a feel for the powerband and throttle I was off.

I’ve done a million laps of The Farm and never been fully satisfied on any bike I’ve ridden on the challenging layout. There is always a section that doesn’t suit a bike in some way. But not this time. The TZ250 is perfection.

The bike was jetted on the rich side so it was a matter of rolling off the throttle very gently mid-turn to lean the bike out then it would snap into its powerband and that sticky rear Bridgestone would step out. So much fun! The gearbox actuation was incredible and the quickshifter sensational.

But the big thing for me was the performance of the front-end – the tyre, brakes and forks all worked together to give feel and accuracy that I simply have never felt before. No chance of running wide or missing an apex whether on or off the brakes. The chassis was inch perfect everywhere and the most amazing section, the Famous Five Esses, was a dream on the 100kg 105hp pure racer.

The bike was so well presented and it was a real honour to ride it. I can honestly say I’ve never had so much fun on two wheels. It’s over and above the ride on John Kosinski’s Cagiva 500 or Broc Parkes’ ZX-6R. It was just a dream come true for this boy racer!

2009 Yamaha TZ250 5KE SPECIFICATIONS 

Price: N/A
Power: 105Hp
Wet weight: 95kg

Engine: Yamaha 5KE 250cc two-stroke GP engine, SJK internals
Bore & stroke: 54 x 54.5mm 
Displacement: 249cc
Compression: 7.2 – 7.7:1
Fuel delivery: Keihin flatslides
Exhaust: Yamaha Racing
Gearbox: Cassette-style adjustable ratios
Clutch: Dry
Final drive: Chain

Chassis: Aluminium, hand made
Wheelbase: Variable
Rake & trail: Variable
Suspension: Front: Showa; Rear: Showa
Brakes: Front: Nissin/Brembo Rear: Nissin
Wheels: Front: 2.75 x 17 Magnesium Rear: 5.50 x 17 Magnesium
Tyres: Bridgestone slicks

2009 Yamaha TZ250 5KE Gallery

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Firstly, any motorcycle used for competition, in our case, road racing, must by National and State motorcycle racing governing bodies standards, have certain parts lock wired for safety reasons. Parts including, drain plugs, oil filters – either spin on type or cartridge type oil filters, filler caps, radiator caps, water overflow caps front brake calliper mounting bolts and any other plug or drain that can allow the escape of any fluid from the motorcycle must be lock wired and inspected before the motorcycle can be used for any competition.

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Track bikes, although not race bikes, should still be lock wired. Track bikes are under far more stress over a short period of time than a road bike. Any mechanical device has an inherent vibration or harmonic point that can loosen bolts, nuts and fittings with great ease, everything may be tightened to torque specifications, but with constant high rpm many of these fittings will loosen and can then cause a weep or a spill of fluid.

Obviously any fluid spilt onto a track during racing or track days is a highly dangerous event. It can sometimes take half a lap or more before a rider of a leaking bike may realise he has a oil or fluid leak, or it may cause him or her to crash as a result of the same fluid leak, it can also of course, cause other riders to crash when they run over the spilt fluids. As you can imagine this can seriously delay any racing or any track sessions while the offending fluid spill is cleaned up from the track to then allow racing or track sessions to continue. As a racer and track day manager of Eastern Creek Ride Days I’ve seen the results of these spills in both lost track time, damage to machinery and personal injuries.

By adopting the attitude of safety and lock wiring the motorcycles drain plugs, filters, filler caps and radiator caps; these unnecessary track incidents could almost be eliminated completely. I can hear some of you saying, if I lock wire my road bike, when I sell it people will think it has been raced. It only takes a few dollars to replace the drilled parts with new; no one will really know what you have done. The reality is most race bikes sold as road bikes have had this done already. The benefit is, you have made your bike safer for you for either on the track or road.

Special lock wire tools are available from most good car or bike performance centres. Stainless steel wire of different gauges are available also, but too light a gauge wire may break too easily during fitting, so a reasonably strong wire is best that is also flexible enough to be twisted by the tool.

Once you have identified the bolts and plugs that need to be lock wired, use a sharp drill bit, use either a bench drill (for more control) or a variable speed hand drill to do the necessary drilling of the parts. Try to think about where you are drilling, thinking ahead to where you will attach the lock wire from the part to another securing point on the bike. Try to position the two points so that the plug or part can’t unwind any distance, imagine how the plug would unwind, and attach the wire so it can’t rotate from the locked position.

If you have a spin on oil filter, attach a good quality hose clamp around it and have that clamp pinching the lock wire under it, then you can use the tool to spin the two strands of wire and then attach the wire to another point on the bike, again think about the direction that the filter will unwind and counter that with the anchoring of the lock wire.

The tool is simple to use, cut a length of lock wire, pass it through the pre drilled hole you have created in the plug or part, then double up the wire so you have the two strands next to each other. Hold the wires to where you are going to attach to the frame or other anchor point, at this distance place the tool over the wire and clamp the wires tightly, then lock the pliers shut.

You can then pull on the spiral knob at the end of the plies and they will automatically twist the wires together. Do this a number of times till the wires are twisted like a rope, be careful not to over twist or you will break them and have to start again. Find the anchor point you are using and pass one wire either side of the anchor point and then lock and twist the wires around the anchor point, you can then trim and fold the twisted wires out of the way. You have now successfully lock wired your bike!

Lock Wiring Costs

• Lock wire tool  $35 – $70
• Stainless steel wire per container   $30

Lockwiring is one of the most important things you should do to your bike before heading on track… Words & Photography: Paul Bailey

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