Adjustable Timing Gear

Adjustable Camshaft Drive – Installation (Yamaha SR500 / TT500 / XT500)

Item No.: K30543

IMPORTANT!

Changing valve timing requires solid engine knowledge. Only perform this work if you are experienced with Yamaha single-cylinder timing procedures.

Functionality (what the wheel does)

The angle between the index bores and the outer markings is precisely matched so that the camshaft changes by 1° when the timing chain is moved by four teeth and the index pin by one hole (equivalent to 2° at the crankshaft).

Yamaha Original Setting

Flywheel mark aligned to OT (TDC).
“0” mark on the camshaft drive wheel aligned with the cylinder head cover sealing surface (per Repair Instructions).
Index pin in hole “0”.

Examples

Set Camshaft to 1° Earlier (≈ 2° at crank)

Flywheel mark on OT.
Mark “1” on cam wheel aligned to the cylinder head cover sealing surface.
Index pin in hole “1”.

Set Camshaft to 2° Later (≈ 4° at crank)

Flywheel mark on OT.
Mark “-2” on cam wheel aligned to the cylinder head cover sealing surface.
Index pin in hole “-2”.

Adjustment Range

Maximum possible adjustment is 4° earlier (both labels to “4”) or 3° later (both labels to “−3”). (Cam degrees shown; crankshaft is double: 8° earlier / 6° later.)

All information provided to the best of our knowledge, without guarantee. Ride safe!