TOHATSU BFT250A Service Manual page 383

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Install the timing belt drive pulley [1] by aligning the pin
[2] of the pulley with the long hole [3] of the timing guide
plate [4].
Align the key groove [5] of the crankshaft with the key
groove [6] of the drive pulley, and install the key [7].
CYLINDER HEAD
[7]
[6]
[5]
[2]
[1]
[4]
The guide plate must not turn more than the
distance equal to the drive pulley pin moving in
the long hole in the guide plate.
[4]
[1]
[3]
[1]
14-15