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It now featured an mm valve (smaller than the 88-89 short stroke but larger than the 85–87) and used larger carburetors. The new Mikuni model BST38SS carburetors were 38 mm diameter and featured an additional "Powerjet" high-speed circuit that was used to fine-tune fuel mixture from 10,000 rpm to the rev limiter.
The Honda VFR750F uses a 16-valve 748 cc (45.6 cu in) liquid-cooled cast aluminium alloy 90° Transverse V4 engine, with carburettor fueling, and gear-driven DOHC cams. Its crankshaft has a 180° throw, instead of the 360° crankshaft in the VF and VFR750R (RC30). [3]
A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many ...
The Honda Revolution Control valve is designed and works in principle like the "AETC system." A small computer monitors engine RPM and adjusts a two-blade exhaust valve with an electric servo. Honda equipped many two-stroke motorcycles such as the NSR125 and NSR250 models with RC - Valve power plants.
"Cutaway of Yamaha Genesis inline-four 20-valve engine" The DOHC Genesis engine has five valves per cylinder and downdraft carburetors. Yamaha adopted the 5-valve concept, using three intake valves and two exhaust valves per cylinder, because it allowed both excellent volumetric efficiency and high RPM. As designers began to appreciate the ...
The RF series uses a U-shaped water-filled radiator, which allows the engine to sit lower, and closer to the front wheel. The oil filter is also water-cooled, and there is a cooling fan fitted to the rear of the radiator. This is effective at cooling the motorcycle to the point where it can be used happily at 9,000 ft without overheating.
In 2003, Suzuki redesigned the SV650 with a new pressure-cast aluminum truss frame, bodywork, swing-arm with revised rear brake caliper mounting, exhaust, digital speedometer display and electronic fuel injection/induction system to replace the carburetor.
The valve clearance is adjusted using shims (the earlier heads were prone to cracking under high temperatures because of a cooling chamber that runs between the intake and exhaust valves and allows for steam build up at high temperature - part number 11101-54120, that was fixed in the later 2nd gen heads - part number 11101-54121).
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