Development The prototype Suzuki GT750 was shown at the 17th Tokyo Motor Show in October 1970[5] and launched in Japan in September 1971 as a sports tourer (GT standing for Grand Tourismo) and was developed from the Suzuki T500 with an extra cylinder and liquid cooling. Marketed as the Le Mans in the US and Canada, it was nicknamed the "Kettle" in Britain and the "Water Buffalo" in the United States.[6] The GT750 was heavy at 550 lbs, with a 739cc two stroke three cylinder engine with 70 x 64mm bore and stroke. It had a five-speed gearbox and three into four exhaust. The first model year (1972), the GT750J, had a double sided, twin-leading shoe, 200mm drum front brake with 180mm drum rear. The Exhaust Coupler Tube System (ECTS) that connected the left and right side exhausts together was designed to boost low end torque. Carburetors were 32mm Mikuni slide type and power output was 67bhp at 6,500 rpm. Two color schemes were offered in most markets however a rare gold color would occasionally appear in some countries. Also included was Suzuki's SRIS (Suzuki Recycle Injection System)which was a method for lowering the visible exhaust smoke by collecting and burning residual oil/gas laying in the bottom of the crank chambers. This was a first for any two stroke from any manufacturer. In 1973 Suzuki the GT750K was announced with extra chrome plating and two 295 mm discs replacing the drum front brake. No other manufacturer was offering dual front disc brakes at this time so this was quite a marketing coup for Suzuki. The paint schemes were revised and three colors were still manufactured but most markets received 2 options. The following year the GT750L gained unitized/rack mounted 40 mm Mikuni CV type carburetors, a gear position indicator added to the instrumentation and redesigned side covers along with other detail changes. Paint schemes were again revised but were reduced at two choices. The connecting pipe between the exhausts was removed and the exhausts redesigned to improve road clearance. The engine was also re-tuned with an increase in power to 70 bhp for the Japanese domestic market starting in January, 1974. The rest of the world received these changes with the introduction of the 1975 Suzuki GT750M with the new silencers without connecting pipes, raised gearing and power output increased by 3 bhp now giving a top speed of 120 mph. Handling and performance were thus improved. The 1976 GT750A model pretty much stayed the course with only minor changes to trim items and the obligatory paint colour change. The final 1977 model GT750B had black side panels regardless of tank colour, black headlamp holders, brown faced instruments instead of blue, updated turn signal indicators/lights and taillight assembly. As with all big two strokes of the late 1970s, the GT750 was a victim of stricter emission regulations and competition from technical developments of four stroke motorcycles.

May 21, 2009, Oklahoma City, OK - Darwin Motorcycles, manufacturer of Brass Balls Bobbers & Choppers, today announced a partnership with Spectro Performance Oils. The race-inspired Bobber and Chopper manufacturer has named Spectro their brand of choice for all of their motorcycle lubricant needs. Every Brass Balls Bobbers’ motorcycle will roll off the assembly floor with synthetic Spectro HD 20w50 Engine Lubricant in one of three bullet-proof engines including the Crazy Horse V-Plus, Harley-Davidson EVO or the S&S mill. Spectro HD Platinum 75w140 transmission oil will ride in the Baker Drivetrain transmission, which is standard in all Brass Balls motorbikes. Brass Balls Bobbers’ Ride America Campaign is a sourcing program for innovative American made products. The firm looks for partners where they can provide a true distinction from other motorcycle manufacturers. “We are excited about integrating their products into our motorcycles,” commented Dar Holdsworth, Brass Balls Bobbers’ BossMan. Their high quality polymers combined with significant quantities of zinc/phosphorus is what gives our customers longer lasting oil and a longer lived motor. In addition, Spectro’s viscosity index gives the rider a smoother, quieter motor with better protection at start up… and that is what we all need with our air-cooled v-twin engines.” As a trusted brand in the motorcycle industry for over 42 years, Spectro Oils consistently delivers a top quality product. Their extensive line of products is custom-tailored to help motorcyclists keep their bikes in top performance condition. No matter what type of motorcycle or how many miles it has logged, Spectro Oils unique blends help ensure a quieter, smoother ride. “Brass Balls Bobbers are champions of American manufacturing and when you see their design, quality and price point, you just have to say, WOW,” said Spectro Oils Vice President of Sales, Rollin Karoll. “It’s great that we have a quality custom-production bike made in the U.S. that enthusiasts can buy without going broke.”