The early models suffered from both high prices, poor fuel injection mapping and poor reliability. Sold as a premium model, dealers were few and factory support not ideal in the early production time, meaning that customers were asked to pay a number of recurring visits to the garage. As a result, sales were slow, and second hand prices fell quickly due to owners' reliability concerns. One of the common early problems was with the
clutch basket which was eventually replaced under warranty. The intermediate gear was strengthened and concentricity improved. However, the problem then moved to the next weakest part, the alternator drive shaft/Z25 gear, which, in extreme cases could break at a lubrication hole. It commonly manifested itself in the 1130 variant of the engine, as a difficulty to crank the engine when hot. The root cause of the clutch / alternator drive problem was thermal expansion, which reduced the Z25 / intermediate gear clearances to negative. The solution was to improve the concentricity of both the clutch intermediate and alternator drive shaft gears, and increase their clearance. At the same time, the alternator drive hub fastening method was changed from a lock washer to a
belleville washer to stop the bolt from working loose due to heat cycling. With these changes, the engine reliability improved to meet or exceed its peers. Continual development of the fuel injection mapping also improved the rideability. ==Models==