Building Moto2 Honda CBR600RR Race Bike Engines | Take a Behind-the-Scenes Look…

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Honda CBR600RR 140 hp Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

Any Honda Racing fans? I’m a big sucker for what goes on behind-the-scenes when it comes to motorcycle / sport bike racing whether it be Moto2 like we’re going to be talking about today and of course the usuals with MotoGP, World SuperBike etc. The things that these companies have to do to show up on race-day and actually race are amazing! There’s so much that goes on behind closed doors that none of us will ever get a chance to see and that’s what today’s blog post is about. We’re going to dive into the Moto2 race series, a race series that is the breeding-ground for the likes of MotoGP etc. Every team that races Moto2 uses the same engine, a Honda CBR600RR engine. Of course this little gem of an engine gets worked over and that’s what we’ll be learning a little more about today with what goes on over at ExternPro who takes care of the CBR engines for Moto2…

Moto2 riders have ridden to the moon and back almost three times since the creation of the Honda-powered intermediate World Championship in 2010.

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The company behind this incredible figure is ExternPro, based at Motorland Aragon in Spain. ExternPro took over Moto2 engine preparation from Geo Technology at the end of the 2012 season and is responsible for more than half the total distance travelled by Moto2 riders in the championship’s five and a half seasons, which stands at around two million kilometres.

Each Moto2 rider gets a new or reconditioned CBR600RR engine at every third race throughout the 18-race series, the engines allocated via a lottery system.

Seven staff work full-time at ExternPro to ensure that all riders receive engines that offer reliable and equivalent performance. They have about 200 CBR engines, which are in constant circulation between the riders, the rebuild bay and the dyno.

Moto2 CBR600RR EnginesThe Externpro crew behind Moto2’s Honda CBR600RR engines; left to right: Carlos Lorenz (engine builder), Alfonso Cartujo (data engineer), Trevor Morris (technical director), Alejandro Soriano (dyno engineer), Asier Maldanado (parts man/coordinator), Juan Uson (engine builder) and Alberto Omedes (engine builder)

Moto2 CBR600RR EnginesParts man Asier Maldanado with a few Honda CBR600RR engines. Externpro has 200 CBR600RR engines in rotation between racing and rebuilding

“Our motto is ‘no mistakes’,” says Trevor Morris, ExternPro Technical Director who has been involved in Grand Prix racing since 1980, working with a who’s who of GP racers, from John Ekerold and Niall Mackenzie to Nicky Hayden and Mika Kallio. “We probably go a bit over the top with our preparation, but the idea is to maximize reliability and equality between all engines.”

Moto2 engines are lightly tuned versions of Honda’s standard CBR600RR streetbike engine, using HRC race kit parts that include a ported cylinder head, camshafts, valve springs, ECU, AC generator and a taller first gear. Pistons, crankshaft, connecting rods, gearbox and so on are standard CBR items.

Honda CBR600RR HRC Race Bike Engine / CBR SuperSport SportBike 600 RR

Moto2 CBR600RR EnginesMost Moto2 engine tune-up parts, including the ported cylinder head, are taken from the HRC World Supersport CBR600RR race kit

Engines are reconditioned after three Grands Prix with new pistons, crankshaft and rods. All engines are numbered, with a detailed record available for each, and sealed in four places to ensure that teams cannot make their own internal modifications.

Moto2 CBR600RR EnginesLeft to right: engine builders recondition CBR600RR engines every 1500km in Externpro’s building bays. From left to right: Lorenz, Omedes and Uson

Moto2 engines live an incredibly tough life, with the world’s best up-and-coming riders taking them to the limit and beyond in a quest for success that they hope will take them into the premier MotoGP class.

Moto2 riders execute about 90,000 gear shifts per Grand Prix weekend, which adds up to 1.6 million for the season! The ECU has a rev limiter set at 15,900rpm but some riders regularly exceed this limit on downshifts.

“We’ve had some top riders who like to use over 17,000rpm on downshifts,” adds Morris. “As part of the Moto2 system, we get all the data from all the bikes immediately after every session and race, so we can make sure that no one is doing anything they shouldn’t do. Our software automatically highlights anything that’s outside the normal parameters, like extreme rpm or high water temperature. If we see a rider using too many revs when he’s going down through the gears, I’ll visit his team to tell him the engine will be fine, but if he keeps over-revving it like that, it’s bound to lose a bit of power by that engine’s third race.”

Honda CBR600RR Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

ExternPro’s contract with MotoGP rights-holders Dorna allows a three percent variance in peak horsepower – just under 130 horsepower – but the company’s dedication to excellence has helped them to reduce that difference to around one percent.

“We’ve just tested a batch of 60 engines and they were all within 1.2 horsepower of each other – that’s down to Honda production quality and the work we do at ExternPro,” says Morris, who has worked on all kinds of Honda race bikes over the years from the NSR500 two-stroke to the RC211V MotoGP bike.

“We replicate all our processes to minimize any discrepancies, then we put together graded batches of engines, to make sure that there’s virtually no difference between all the engines in each batch. That way, all the riders know they’ll have a competitive engine.”

Moto2 CBR600RR EnginesDyno engineer Alejandro Soriano puts a CBR600RR Moto2 engine through its dyno test. Note samples of engine oil to be sent away for specialist analysis

After the rebuild process all engines – which run on Elf fuel and Liqui Moly lubricants – are run in and tested on ExternPro’s in-house dynamometer. The power made by each engine is transferred to the electricity grid.

Moto2 CBR600RR EnginesEach new or rebuilt CBR600RR engine spends two hours on the dyno, for running-in, general analysis and a horsepower check

“We run them in for two hours on the dyno, so that the guys can use maximum throttle from the moment they first get the engine, so they don’t have to waste valuable track time running in. After we’ve run in each engine, we record its horsepower, make a pressure check and analyze an oil sample to ensure the run-in procedure was completed without problems.”

Moto2 CBR600RR EnginesDyno engineer Alejandro Soriano puts a CBR600RR Moto2 engine through its dyno test. Note samples of engine oil to be sent away for specialist analysis

The concept of the Moto2 series is low cost and equality of technology, which helps riders shine through with their talent.

“There’s also another benefit which some of team owners tell me about,” says Morris. “They like the series because the costs are very black and white. They pay a set amount for engine supply per season means so they can budget much more accurately. They don’t have to worry about paying for engine R&D, paying a new tuner, paying for engine rebuilds and breakages and so on, which are all unknowns in a normal race series.”

Honda CBR600RR Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

Honda CBR600RR Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

The philosophy of Moto2 is to focus on the riders, who can concentrate on honing their skills because they don’t need to spend so much time in the pits setting up their engines.

Moto2 riders are now spending more and more time on track, with 2014 champion Tito Rabat starting the trend of leaving the pits at the start of each session and returning at the end, rather than making several visits to his crew for minor adjustments. This allows riders to perfect their skills for each track; it also means that many riders now exceed the 500 kilometers allowed per weekend, but without any negative effect on the engines.

ExternPro have had just five engine failures in a million kilometers. Three of those were due to broken cranks bolts, a problem that was traced to running the engines without the standard starter motor, a modification that altered the engine’s harmonics. This issue was solved by redesigning the crank bolt and thrust washer.

“Having worked in motor sport for a long time I know that many engine failures are due to human error, so I really push the guys to understand that every little thing they do to the engines really does count,” Morris adds.

The Aragon Motorland Technology Park was established with the help of local government grants, which were made with the intention of getting locals back to work. Thus Morris is the only non-local at the company. The other six staff were all new to the motor sport world: engine builders Carlos Lorenz, Alberto Omedes and Juan Uson, data engineer Alfonso Cartujo, dyno engineer
Alejandro Soriano and parts man/coordinator Asier Maldanado.

Engines are transported in flight-cases, via the ExternPro truck in Europe and via Dorna’s chartered planes for flyaway races.

Honda CBR600RR Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

Honda CBR600RR 140 hp Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

The current Honda and ExternPro Moto2 contract continues to the end of the 2018 World Championship season.

What type of rules and regulations are there for the Moto2 Race Series?

1. Fuel tank size and shape is free – there are no fuel consumption limits for the stock engines. As with MotoGP, fuel is carried as low and as centrally as possible. Eni is the series sole supplier.

2. The engine management ECU is supplied, and software modifications are banned. Teams have a limited range of settings, while organisers have the right to swap ECUs at any point.

3. Four-cylinder 600cc engines are identical sealed units, supplied and maintained by ExternPro (formerly Geo Technology), on behalf of the organisers. Based on the Honda CBR600 engine, they produce about 140 bhp.

4. Air intake design is free, but must feed a standard airbox, as supplied to the teams. Throttle bodies and injectors are also supplied, along with fuel lines.

5. Two different Dunlop tire specifications of front and rear tyres give riders a limited choice. Each gets seven front and nine rear slick tires for the race weekend, plus three sets of wet-weather tires.

6. The chassis “must be a prototype”, with no production parts. Designers are free to explore chassis possibilities, within existing racing rules. As in all classes, full streamlining is banned.

Honda CBR600RR Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

7. Choice of front and rear suspension is free, but electronic suspension controls are banned, along with high-pressure hydraulic systems.

8. Wheel dimensions are fixed, 3.75” x 17” front and 6.00” x 17” rear. Composite construction wheels (eg carbon fiber reinforced) and carbon brakes are banned. Both rules help control costs.

Moto2 was created to replace the 250 class. The aim was for a competitive World Championship that would offer exciting racing for the fans and a valid stepping stone to MotoGP for the riders.

Moto2 was conceived as a prototype class using 600cc four-stroke engines. At the same time, the concept was refined with two radical innovations:

Control engines – Each rider is allocated an engine (sealed) from a pool of identical Honda units that we discussed above. Only the fuel and oil provided by the official fuel supplier can be used.

Control tires – Each rider will have exactly the same choice from a total of 16 slick tires per race weekend. Dunlop was awarded the supply contract in 2010.

The rules ensure equality in these fundamental areas, while allowing chassis designers freedom to explore different solutions in full prototype motorcycles.

The engines, based on Honda CBR600 street units, and delivering up to 140 horsepower are race-prepared and subsequently maintained by the appointed supplier. A racing slipper clutch and a six-speed fixed-ratio gearbox are included. The fuel, and lubrication systems are also part of the standard package.

Engines are allotted to teams by the race organization’s Technical Director, on a random basis. They must be returned to the official engine supplier for rebuilding at regular intervals 932 miles (1500km).

Honda CBR600RR Moto2 Race Bike Engine / CBR SuperSport SportBike 600 RR

Crucially, organizers will also supply the engine management system, with a same-for-all standard ECU. Certain basic tweaks will be permitted using a standard software setting tool, which comes as part of the Moto2 kit. Other software modifications are banned, and the Technical Director has the power to swap ECUs, as well as to check their recorded data. A standard datalogger system is also supplied.

Exhaust is free, but maximum noise level is set at 115dB/A.

All maintenance will be performed centrally. Teams may not touch the engines, beyond basic set-up and running maintenance, such as oil changes, or replacing plates in the standard slipper clutches. Radiators are free, but use of the standard oil cooler is compulsory.

Chassis design “must be a prototype”, the rules state, with no production parts used. At the same time, exotic metals and electronic suspension are banned, and brakes will be steel rather than the costly carbon used by MotoGP. Composite wheels are also not permitted. Minimum weight of the complete motorcycle is 135 kg / 297 lbs.


Equality in tires is also the goal.

Dunlop developed five front tire compounds of which a choice of two were brought to each round. As the season progressed it was clear that two of these compounds (a medium and hard compound) were favoured by all riders.

For rear tires there is a wider choice of seven compounds, for which two are chosen for each race. This year the softest compound, 6712, has been dropped and improvements made to another three. Feedback and lap times from the pre-season testing was good.

A maximum of 16 slick tires may be used per race weekend. All tyres are barcoded and allocated on the day before practice starts to each rider by the Technical Director. Some circuits will require ‘dual’ tires, with different compounds on the left and right shoulders and, in some special cases (like Australia’s Phillip Island) also possibly asymmetric construction.

Three sets of wet tires in one specification will be allocated: if every practice and the race are declared wet by Race Direction a further set of wet tyres will be authorized. As in MotoGP, no “intermediate” tires will be supplied.

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3 Comments on this post

  1. Hi looking for a 600 to go micro sprint car racing in California Yamahas are the thing but i am a Honda guy any suggestions.

    Russell Barber /
  2. Hi,I`m a member of a Fsae team and we use a Honda 600rr motor. Can you provide us de solidworks file of de Honda 600rr motor?

    Fernando Tsukamoto /
  3. I’m after performance exhaust valve springs for 2016 CBR600RR. Have searched the web for quite some time. Unable to track down HRC springs and have been informed that they have been discontinued. Would appreciate any input regarding manufacturer and availability.

    Kelvin Hawtin /

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