86 pages and profusely illustrated with more than 150 illustrations, diagrams and charts, size 8.25x10.75 inches. The factory never published a workshop manual for the original GT250K/L/M or the later GT250A/B/C models (explanation below). This publication contains the logical compilation of factory documentation that will assist in the maintenance and repair of the 1971-78 Suzuki GT250 series.
As the GT250 evolved from the T250 we have included a copy of 1) the factory T250/T350 Service Manual, 2) a copy of the factory Disc Brake Service Manual, and 3) a copy of the factory GT250A Technical Bulletin. The later 1984 factory publication of the T250/T350 Service Manual includes the Technical Bulletin and no additional data is included.
THE EXPLANATION BEHIND THE 'MISSING' GT250 WORKSHOP MANUAL
1971: The GT250 evolved from the 1967-72 T250 - the very first models, introduced in 1971 for the Japanese market only, were basically cosmetically upgraded versions of the front drum brake T250 but advertised as a GT250. Consequently, the T250/T350 Service Manual was appropriate for maintenance and repair information.
1972: Only available for the Japanese market, the '72 model was now badged as a GT250 with a redesigned cylinder head and Suzuki's 'Ram Air' system. Neither of these modifications affected the major mechanical components and the T250/T350 Service Manual would still suffice. However, the addition of a front disc brake necessitated the publication of a Disc Brake Service Manual.
1973-75: In 1973 the GT250 became available in both Europe and USA with identical specs to the '72 Japanese-only model. In this configuration the GT250 would continue on with minor cosmetic changes as the 1973/75 GT250K/L/M. And the combination of the T250/T350 Service Manual used with the Disc Brake Service Manual was still adequate for service and repair information.
1976-78: In 1976 the GT250 engine was upgraded to a four bearing crankshaft with four transfer ports and 28mm carburetors with rubber mounts in place of the '75 and earlier two transfer port engines that were fitted with 26mm carburetors mounted directly to the cylinders. The new crankshaft incorporated slightly different oilways for lubrication and the cylinders used different stud spacing than earlier models. There was also a change in compression ratio, a washable air filter and revised 2nd and 3rd gear ratios. These modifications required the publication of a Technical Bulletin that identified the differences between the 1973/75 and 1976/78 models and when combined with the T250/T350 Service Manual and the Disc Brake Service Manual should be considered a substitute for a model specific GT250 workshop manual.
The 1971-78 GT250 series can trace its mechanical origins back to the 1962-67 250cc T10 and the 1965-67 250cc T20 which evolved into the 1967-72 250cc T250 that ultimately became the first 1971 GT250 (see above). Consequently, many engine and transmission parts from those earlier machines are interchangeable with the later models. Most of the progression from the T10 through the end of the GT250 series was basically cosmetic to keep pace with changing marketing demands. Other than the 1975 engine modifications the GT250 remained basically unchanged from its 1971 introduction until 1978, when it was discontinued and replaced by the X7, a completely different motorcycle. Therefore, the factory issued workshop manuals for the T10 and T20 motorcycles may also be of assistance to owners of the GT250 series.
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