Star Racing
800-841-7827

MOTORCYCLE CAMSHAFT INSTALLATION INSTRUCTIONS

1. Install cams using stock timing marks.

2. Locate TDC on the degree wheel using a dial indicator or a positive stop.

3. To find intake lobe center, rotate engine until you have found maximum lift using a dial indicator on the lifter. Zero indicator with cam at maximum lift. Rotate engine in reverse direction until indicator drops 0.040". Rotate engine in normal direction until you are 0.020" below maximum lift. Mark or note degree wheel location. Rotate engine in normal direction, going through maximum lift and until you are 0.020" below that point. Mark or note degree wheel location. The intake lobe center is located at the point mid-way between these two readings. The intake lobe centerline is determined by calculating the number of degrees from your TDC reading to your lobe center reading.

4. Repeat step 4 to locate the exhaust centerline.

5. You must check the following clearances:
a. Valve-to-piston
b. Valve-to-valve
c. Coil-to-coil
d. Retainer-to-guide

6. Over torqued and sloppy sprocket slotting can result in flange breakage.