Eton VECTOR ST 250 Service Manual page 48

Install cam chain on to sprocket and align the
timing mark on the sprocket with that of cylinder
head.
Align sprocket bolt hole with camshaft bolt hole.
Tighten the sprocket mounting bolts.
Caution
Make sure timing marks are matched.
Install cylinder head side cover (3 bolts).
Install thermostat (2 bolts).
Loosen auto tensioner adjustment bolt and
remove bolt and spring.
Install tensioner and install spring and adjustment
bolt.
Install cylinder cover (4 bolts).
2 bolts
3 bolts
Thermostat bolts
Tensioner adjustment bolt
4 bolts
48
Timing mark