LONDON, England - Yamaha has unveiled its 2014 YZ four-stroke line-up and it’s headed for SA!The new 2014 YZ-F range includes the YZ250F and YZ450F, the company’s latest “stride towards off-road excellence”.Yamaha SA’s Adrian Bac says: “Unfortunately it is too early to give any indication of pricing and local availability at present. I am pretty sure that both the YZ250F and the YZ450F will be available in SA later in 2013 based on historical information of past years to garner this.” DIFFERENT STROKESThe new bikes share the same platform and range of technology. The models sport a rear-slanting engine and new snaking exhaust pipe from the back of the cylinder head. The layout sets the YZ-F family apart from the competition. According to Yamaha, the YZ450F has benefited from this design since 2009 and has been the benchmark in terms of performance, feedback and tractability for 2014.At the core of the 2014 YZ-Fs is the same beating heart - the shared engine principles is a major calling card for the company. Both motors are fuel injected with the latest propulsive engineering available on the market for more power, response and grunt.INDIVIDUAL CONFIGURATIONThe YZ250F might share ingredients of its "big brother" but the configuration has special components of its own: a new cylinder head, piston, larger intake and exhaust ports, valve mechanisms and ignition timing with a lighter crankcase to help with weight reduction.The 450cc fuel injected, liquid-cooled, four-stroke, four-valve, DOHC, rearward-slanting single cylinder engine of the YZ450F now boasts a more user-friendly character. Larger valves makes for better performance and a new ECU and gear rations mean more playful torque in the first gears with a strong push through the powerband up from third gear. Other elements enhancing the bike are the overhauled intake and exhaust ports, cam profiles and crank ratios.There’s also a "MX Power Tuner" accessory for both models which allows a fast modification of the motor’s settings for preference or different terrain.The YZ250F and YZ450F benefit from mass centralisation features such as the snaking exhaust pipe layout and deeper location of the bigger fuel tank, central placement of the engine ECU and a new wire harness. The 250 boasts a new, stronger gear-shift system that works in with a smoother clutch. Yamaha says the new models scream "race us!". The biggest change is the disappearance of the fuel tank hub with the whole 7.5 unit buried into the machine yet, still easy to reach. The seat and rear fender have been redesigned, with the air scoop as a prominent feature. New lines are evoked through Yamaha’s "in mould" graphics: the graphic film is inserted into the injection mould before the part is cast so that graphics are morphed into the piece itself. The result is a translucent look and a more scratch-resistant surface. PIMP YOUR YZThere is a treasure trove of accessories and add-ons that can reduce more weight, customise the aesthetics or boost performance. GYTR performance parts can replace the OEM clutch components for even lighter replacements and improved cooling and lubrication. A GYTR ported cylinder head will push torque and engine output even higher and the cylinder head is delivered completely pre-assembled for easy and quick mounting. The machined alloy ignition cover and the Akrapovic slip-on muffler and titanium header pipes can all be purchased for more weight reduction.The two colours available will be Racing Blue and Sports White.The YZ450F will be on sale from August 2013 with a price tag equivalent of R103 500 and the YZ250F due for November at about R100 000 in the UK.