| Listed in parts books | Not catalogued by year yet |
K/S QUADRANT B50 LATE
Kickstart quadrant for the B50, late-type, part number 57-4639.
This is a kickstart quadrant listed under part number 57-4639, described in the catalog as the late-type unit for the B50. The quadrant is the toothed component inside the gearbox that the kickstart lever engages when you swing it down, turning that motion into rotation of the gearbox mainshaft to fire the engine over.
Read more
Our records on this one are thin — we don't have more detail beyond the description itself, and it hasn't turned up across multiple catalog listings in our files. The B50 designation tells you the family it belongs to, and "late" tells you there was an earlier version that this one superseded or ran alongside, but we can't tell you exactly where the cutoff falls without more to go on.
Give us a call and we'll confirm fitment before you order — kickstart quadrants can be specific to a particular version of the mechanism, and we want to make sure this is the right one for what you're working on.
Sorry if we got something wrong here. If you think this information isn't correct, .