New clutch: a total overhaul has produced a lighter, more compact 6-spring clutch that improves its engagement, precision and stability as operating temperatures change. A new design to the clutch cover is more streamlined and stylish.New gear shift system: improves the precision of the transmission and eliminates any uncertain mis-shifts.New cylinder: new two-piece design for closer machining of the power valve increases performance in terms of power and torque throughout the rev range while keeping the power delivery perfectly linear.Domed piston and new cylinder head profile: together with the new cylinder, these increase engine performance and improve running at low revs.Crankshaft: rotating mass values were revised to match the new features of the engine and the crank pin was reinforced to improve reliability.New connecting rod: reinforced lower bearing area to reduce friction and heat while improving reliability.New centrifuge: with larger spheres to better adapt to the new primary drive ratio, ensuring better power delivery.New combustion chamber: a slight increase in compression ratio has boosted performance.. Fans of the Beta Xtrainer will be happy with the news that Beta are launching a 250cc two-stroke model to join their already established Xtrainer 300. Following the great success of the XTrainer 300, Beta launches on the market the 250cc version. Originally born for non-European markets, the brand. These important technical innovations put the new Xtrainer in a particular niche of the Enduro market, making it the perfect choice for those looking for a 2-stroke bike with slightly softer power delivery while still offering excellent ride-ability and ease of use..