(which was not exported to Europe) for the reason that sales had decreased in favor of the Interstate and Aspencade models. This led to the decline of aftermarket manufacturers such as the Vetter Fairing Company. The GL1200's competitors were becoming more numerous. Last of the big Japanese manufacturers to do so, Suzuki finally entered the marketplace in 1985 with their full-dress tourer, the GV1400 Cavalcade with a DOHC, four valves per cylinder, V4 engine. In 1986 Yamaha enlarged the Venture's V4 engine to 1300cc, and Kawasaki introduced the ZG 1200 Voyager XII with a four-valve, DOHC, Inline-four engine. With three versions of the Gold Wing boxer motor spanning a dozen years, by 1987 further development of the flat-four engine was regarded as being constrained by the law of diminishing returns. Piston displacement had been increased twice to generate more torque, but this also made each power stroke more intense. During the same time period, gear ratios had been raised to decrease engine RPM (boosting fuel economy and reducing vibration as well as noise levels) which in turn made pulses through the drivetrain seem rougher to the rider because firing intervals were farther apart. The obvious way to deliver power more smoothly (as Irimajiri-san had demonstrated with the M1 engine) was to step up from four cylinders to six. GL1200 Interstate Having introduced the full-dress Interstate with the GL1100, Honda used the GL1200I '84 to refine the Gold Wing's fairing so that it would come across as a basic part of the bike and not as an afterthought. The new model Interstate (still called De Luxe in Europe) had an automotive-style instrument panel up front and increased luggage capacity in back: in each saddlebag plus another in the trunk. Dry weight for the 1984 Interstate was . Despite giving the Gold Wing taller gearing the year before, in 1985 Honda shortened the overall gearing to improve performance. There were many small changes to the GL1200I '85 but atypically its price was the same as it was the previous year, and at its weight was basically stable. The GL1200I '86 got more small updates, but the significant change was that all Gold Wing engines were being produced in Honda's Anna, Ohio plant from July 1985. Claimed dry weight for the 1986 Interstate was unchanged. The GL1200I '87 got a new seat design with three-stage foam; the weight was unchanged for 1987, the