IH: Primary Drive & Clutch

Primary Design

Primary Chain Tensioner

77 XLH with 86-90 Primary Chain
Tensioner & Spring (40019-86) 1)

Primary Fill / Drain Holes

Engine Sprocket

1957-1966 XLH, 1958-1969 XLCH sprocket kick only (40288-58) has the rear mounting surface below face.
1967-1976 XLH, 1970-1976 XLCH sprocket (40235-70A) has a mounting surface protruding from the face.
1977-up (all) sprocket (40235-74) has a mounting surface protruding even farther with a larger seal diameter.
None of them are marked with part#s. 2)

Comparison pics: 3)

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