Meguro 350cc : Y2 Rex Meguro 350cc: Y2, the middle class "Rex" as updated models, from March 1957 until February of '59, 1050 cars were produced in about two years. Y2 Rex is positioned as a model in Meguro Motorcycles rare experimental production, and other models from its appearance is not Meguro sense, the structural features seen. The Y2 is also said first and only Meguro, combining a steel pipe and press, the composite frame has been adopted. Around this time, the other major motorcycle manufacturer in Japan, was becoming mainstream welded frame assembly member was press-formed steel in the structure of the body. As characteristic of this style, and to build (monocoque), to assign such authority to be able to pay on the inner surface consisting of a hollow steel member can be thin, light and rigid frame can be configured outer shell frames . And, also cost down, due to a pipe frame of conventional manufacturing steps can be reduced, from that you can pass Do extended thin the product, the name of the high initial costs (such as tooling cost for the press) larger the number of mass production, about pocket bike sell in huge numbers, the effect could be expected. Meguro seems to be, as a reference situation and motorcycle manufacturer in Japan such, the use of stamped parts by reasons of design in the overseas manufacturers, it has its own experiment Meguro. As Syowa and Honda, but did not configure and monocoque, or, or maintenance of the design of Meguro, to withstand the mounting of heavy engine, where necessary, has a structure from the former by pipe frame or it will not be. Part by member As can be seen in the vehicle, was press-molded, in the back from near the saddle at the rear of the institution, such as those aware of the moped design was out of the popular small car at the time, rounded, the design of unique stamping parts is. Compared with the Y-"Rex" of the previous model, the difference stand out in that smart. In addition, the rear wheel suspension system employs a swing arm aligned to the senior model. Has been designed for the business while, with an emphasis on running also. However, cases such as the headlight is configured to be simple compared to the previous model, which is a specification tailored to the Meguro model during the same period. Another technology, Y2-"Rex" was adopted for the first time, there is a "Sendaite-metal" special steel castings by casting process. "Sendaite-metal" as a result of basic research by Dr. Masao Honma, Institute for Materials Research, Tohoku University, was invented as a unique method of producing high-duty cast iron (patent), which is the casting process. In Meguro, take advantage of the manufacturing process of casting for the part of cylinder block uptake of this technology within the company, its characteristic is exhibited. Was used to type L2:OHV4 cycle single cylinder engine for Y2. "Sendaite-metal" is also used to Meguro 650cc : T2 Senia, confirm its usefulness. Since then, all that will be used to the new motorcycle in Meguro. Dramatically with respect to the engine, to see the difference compared with the previous model for the L-type engine is small, by the adoption of "Sendaite-metal", the performance is from 13.0HP/4000rpm, to 16.0HP/5200rpm has improved. In Y2 there was willingness to work in Meguro, or because it is an experimental element, also found that failed part. Weight reduction through the use of stamped parts that are expected to initially, heavier from 178kg, to 186kg will specification halfway through composite frame with pipe frame from the traditional, compared to the Y-"Rex" of the previous model as a result that. Such a failure, in the matter at the time began to be adopted member lightweight is the name of common, as the failure of a scooter "Junoo" Honda's famous, the material itself even though it is something light and strong, and how to design immature, the stress data are unknown at the time could not be a proper use is a factor. (Although aimed at weight reduction adopted in FRP-reinforced plastic body at the time, was noted tip member and the light and strong, has been a failure becomes too heavily on the reverse) However, such attempts will be based, you are to achieve lightweight and high rigidity frame is current. Another speculation is that it came off, at the cost down by reducing the production of man-hours, Y2 did not sell in huge numbers in the model such as a pocket bike. As a result, the initial cost was expensive it becomes deficit is directly passed on to the product. Meguro's flagship product seems to be a motorcycle, so medium-sized or larger, at around several thousand, the extensive use of stamped parts and was difficult even in the model number of monthly "Junior" highest number of sales. After all, in Meguro motorcycle press frame was adopted in addition to Y2 was not produced. In terms of sales, the market was shifting 350cc middle class is to pocket bike with reduced popularity, became more powerful style well. Its sales performance, stay slightly to one thousand units. In 1959, with the advent of the new model was adopted OHC4 cycle engine of high performance, be carried over to the middle class in Meguro and type YA as a sport model. Seems to be the remaining number of Y2, in order to manufacture a small number, and considerably less. *** Principal statistics *** * Total length : 2,190 mm * Full-width : 820 mm * Total height : 1,050 mm * Distance between axis : 1,435 mm * Weight : 186 kgf * Engine type : L2 type : Single cylinder OHV 4 cycle * Entire aerodynamic volume displacement : 348 cc * Installed capacity : 16.0 HP / 5,200 rpm * Full speed : 110 km/h * Fuel economy : 40 km/L * Transmission : Advance 4 step rotary * Tire : (Front) 3.00~19-4 / (Rear) 3.25~19-4 * Starting system : kick