[Product Description] ・Water pump gear ・Impeller (19215-KA5-690) ・Copper washer (90447-KE1-000) ・Oil seal for WP (93103-10011) ・Oil seal adapter ・O-ring for adapter
[Description]
DMR-JAPAN original parts
As it is for racing, the worm gear that operates the oil pump is not cut. It is also installed on the ZERO-4 class winner Yagi's machine at Taste Tsukuba, and has been certified as a high spec part!
[Specifications] The chassis dynamometer test has confirmed the effect of increasing the PS by about 1 PS, and it also promotes the coolant temperature drop in the high-rpm range.
[Oil seal for WP] Converts the high friction mechanical seal of the stock to a low friction oil seal. The oil seal is made of Stock Yamaha water pump oil to ensure stock quality and durability.
[Impeller] By using the lightweight high-rpm impeller used in CR500, HRC/RS250, the flow rate of cooling water is optimized and cavitation is suppressed. With the stock impeller, the pressure difference at the pump inlet/outlet becomes too large at the high RPM range used at the race track, causing cavitation (bubbles) and a significant rise in water temperature.
[Shaft] SUS304 stainless steel, which has excellent mechanical strength and rust resistance, is used.
The stock product has a minor trouble that the center of the gear cracks structurally, but this product adopts the two-piece structure that is common in the resin gear of each motorcycle manufacturer, and the crack prevention measure is given. Features (1) The gears are made of MC nylon, which is of higher quality than the stock article, so durability, impact resistance, and self-lubricating properties are dramatically improved, and wear resistance due to foreign matter (iron powder) is even better than metal! Feature (2) There is no worry about cracks due to hardening and contraction caused by pressure fatigue, thermal expansion and aging because there is play in the shaft and gear. Feature (3) The addition of a ball bearing to the oil seal adapter reduces the shaft runout and improves the oil seal tightness. Feature (4) The shaft is made of SUS304, which is suitable for mechanical parts and has excellent corrosion resistance, so it can be used in fresh water without anxiety. Feature (5) When the center loosens too much, the gear can be easily replaced by simply removing the clip.
[How to install] (1) Remove the bearing, oil seal, and mechanical seal from the clutch cover, and clean the adhesive from the press-fit area of the mechanical seal. (2) Clean the drain hole and plug it with a liquid gasket (If there is a hole on the upper side as well, depending on the year, plug both holes). (3) Insert the O-ring into the case first and press-fit the oil seal adapter into the case using a hydraulic press.(Please avoid press fitting by hitting with a hammer as much as possible as it may cause displacement of the oil seal). (4) Insert the oil seal into the adapter (the one with the engraving facing you is the one facing you). (5) Install the bearing [without the oil seal] next to the bearing. (6) Install the water pump gear, copper washer and impeller.(Apply threading compound to the screw part of the shaft to prevent galling) *It is possible to install the oil seal in step (5) without doing step (2), but it will increase friction.
Caution
*As it is for racing, the worm gear that operates the oil pump is not cut *When using at low RPM, the coolant takes longer to exit the cylinder, causing the water temperature at the outlet to rise slightly.The high coolant is also slowly cooled by the radiator and enters the cylinders in a cooled state, so the cylinders are well cooled, but if the thermo-center is installed in front of the radiator, the water temperature will be displayed higher than usual. *The specs are further enhanced when used in combination with the Big Radiator. *Please take advantage of this excellent product, which is also used by racing stores involved in the All Japan Road Race Championships! *There may be changes in product specifications due to the manufacturer's reasons.
