Drive chain inspection cover plate and fill plug for motorcycles

A side access fill spout and fill plug assembly for access to a fluid container comprising;

• a substantially vertically oriented wall component of a said fluid container configured with a fill spout projecting outward and upward from said wall component, said spout having a mouth and a straight bore though which fluids may be passed, said bore extending through said wall component at an angle at least about 30 degrees upward from normal and terminating in an exit hole on the backside of said wall component, said bore having a first region of relatively larger diameter proximate said mouth and a second region of relatively reduced diameter proximate said exit hole, said bore having an O-ring locking groove recessed in the wall of the bore in said first region;
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• a fill plug with a top section and a shaft section, said top section configured with an upper O-ring exposed axially downward from an O-ring retention groove in the underside thereof for making sealing contact with the mouth of said fill spout and a lower O-ring exposed radially from an O-ring retention groove in said shaft section for making locking and sealing contact with said locking groove in the wall of said bore, said O-ring locking groove spaced from said top section such that said upper O-ring of said plug is held in compression against said mouth of said spout by retention of said lower O-ring in said locking groove when said plug is fully inserted into said spout.

An inspection cover plate, fill spout and fill plug assembly for the chain drive housing of a motorcycle comprising;

• a cover plate configured with a fill spout and mounting holes about its periphery, adapted to fit an inspection port in said housing so as to be oriented in a substantially vertical plane with said fill spout projecting outward and upward from said cover plate at an angle of about 60 degrees from vertically upward, said spout having a mouth and a straight bore though which fluids may be passed, said bore piercing said cover plate and terminating in an exit hole on the backside of said cover plate, said bore having a first region of relatively larger diameter proximate said mouth and a second region of relatively reduced diameter proximate said exit hole, said second region comprising a conical section and a terminal section of relatively smaller uniform diameter than said first region wherein said conical section connects said first region to said terminal section, the profile of said exit hole comprising the intersection of said second region with the backside of said cover plate, said bore having an O-ring locking groove recessed in the wall of the bore in said first region;
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• a fill plug with a top section and a shaft section, said top section configured with an upper O-ring exposed axially downward from an O-ring retention groove in the underside thereof for making sealing contact with the mouth of said fill spout and a lower O-ring exposed radially from an O-ring retention groove in said shaft section for making locking and sealing contact with said locking groove in the wall of said bore, said O-ring locking groove spaced from said top section such that said upper O-ring of said plug is held in compression against said mouth of said spout by retention of said lower O-ring in said locking groove when said plug is fully inserted into said spout.