Suzuki DF 90 Service Manual page 160

2. Remove bolt 1 and oil pump drive sprocket 2.
(See page 6-12)
NOTE:
Hold camshaft by placing a wrench on the hexagon area of
camshaft.
3. Remove bolts 3 and timing chain guide 4.
4. Remove bolt, nut and chain tensioner adjuster 5.
5. Remove bolt 6 and chain tensioner 7.
6. Remove timing chain 8, exhaust camshaft timing sprocket
9 and dowel pin 0 .
7. Remove bolt A and intake camshaft timing sprocket B .
NOTE:
Hold camshaft by placing a wrench on the hexagon area of
camshaft.
8. Remove driven gear C .
POWER UNIT 6-15