300 kg ( respectively). Less than a year after the introduction of the 550, the wider and longer Hijet Wide 55 (S60) appeared, but the Hijet 550 continued in production and even underwent a facelift in April 1979 and now carried a blacked out grille. In April 1981, the four-stroke S40 Hijet 550 was discontinued, but the two-stroke S38 continued to be available until August 1981 as a low-cost version (by which time the sixth generation Hijet was already on sale). The later ZM-engined versions had . The two-stroke was also popular in many Southeast Asian markets, where emissions regulations were more lax and its lower purchasing price had a bigger impact. Fifth generation (S60) In April 1977, production of the truck version of the fifth generation began. Called the "Hijet Wide 55", to draw attention to its wider body and bigger 550 cc engine, this was the first Hijet to reach export markets in any serious numbers. The 547 cc AB20 was a four-stroke, water-cooled two-cylinder unit with a single overhead camshaft and balance axle. Power output is at 5,500 rpm, while max torque is at 3,500 rpm. Export versions, which had to face less stringent emissions requirements, offered at the same engine speed and at 4,000 rpm. The only transmission installed is a four-speed manual with a floor-mounted shifter; export versions could reach a claimed top speed. The engine is mid-mounted just behind the front axle, and access is gained by simply lifting the front seats. Chassis code is "S60", with the succeeding letter "P" signifying a simple pickup bed with one opening flap; "T" for the three-way dropside pickup; and "V" for the vans. Three months after the introduction of the pickups (in June 1977), a glassed van with sliding doors and also a "panel van" version were released. The panel van was simply a truck with a box mounted on the rear; this version was not exported. For export, a van version without windows or rear seats was preferred. A low floor dropside bed was added in December 1977, and a minor facelift took place in September 1978. The changes were limited to different colored bumpers and headlight surrounds, and a changed metal grille insert featuring a larger "D" logo. All versions were available in either Standard or Super DeLuxe trims, but in March 1979, a comparatively luxurious "Custom EX" version of the light van was