The service manual specifies a level and quantity. 192mm (7.56 inch) from the top of the fork tube with the spring removed and fork compressed. The quantity should be 416mL (14.1oz)
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on right hand side, lower engine cover there is a sight glass for the oil level just behind that the chrome cover is two pieces the rear is removed and the fill is located
A C90 is not a water cooled engine. It is a design that uses air and oil to cool the engine. There is no conventional radiator or coolant on this model. The finned cooler you see on the front of the bike is an oil cooler.
1/Open oil filer neck/hole above foot clutch
2/Drain the oil from cranckcase, drain bolt in front of centre stand. Use a catcher for used oil.
3/Remove oil filter case @ centre of engine block below rad, that hump looking item
4/Put new oil filter the reverse of taking oil filter off.
5/ Close drain hole securely
6/Put new oil into cranckcase abt 3L, check dipstick to see how full it is, if needed continue filling until proper amount is in the cranckcase.
7/ Close the filler neck and it is ready to play
8/ Good enough free advise?
The Filter is on the front, bottom of the engine. It will be tight to get off and must be screwed back on tightly or it will leak.
Oil drain plug is at the rear of the engine, facing backwards.
Oil filling is under the RHS rear chrome cover, two hex socket screws to undo.
C90 takes about 4.5 litres to fill with an oil filter change, 4 litres if you dont cange the filter.
After refilling make sure to hold your bike upright and check the sightglass under the filler. Oil level should be between the markings on the housing.
It's in a box on the front of the bike located under the oil cooler (looks like a mini radiator and has two hoses going to it). If you look right under that cooler you should see a metal plate with ribs on it (either 3 or 4 ribs) that's the front plate. Just above that is a plastic lid to the battery box.
The battery cables are routed behind the box. Once you get the lid off (two screws one on either side) you should see the indents for the cables in the lid. The battery terminals face the rear of the bike.
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