VIDEO: How To Use Fast Eddy Co.'s Cam Gauge Pins for 1999 and Earlier Harley-Davidson Big Twin Motors

Chris Graves creator of Fast Eddy Co. gives you an overall walk through on how to use his Cam Gauge Pins to ensure your cam gear and pinion gear are properly matched to one another and don't fit too loose or too tight. Pinion gears are available in different color codes, and using this set of gage pins to measure your cam gear will then ensure you select the correct pinion gear. These Hardened certified class Z Gauge Pins are made 100% in the USA by Fast Eddy Co. and make this job simple.

For use 1989 and earlier you will want to use a .105" gauge and for use of 1990-1999 you will want to use .108" gauge.

Tips:

• Rubber bands can help hold the pins in place while you take the measurement

• Gently clamping your micrometer in a vise can make it easier to hold everything

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Cam Gauge Pin instructions:

The purpose of this tool is to make sure your cam gear and pinion gear are the correct sizes for each other. It’s important to choose the correct pinion gear to match with cam gear.  If these gears aren’t properly matched, problems can arise.

• If they are too loose, then there will be too much gear lash is present andyou will hear a clicking noise (can sound a lot like bad lifters) from“slapping” contact between the 2 gears. This is an annoyance and should be avoided, but it doesn’t generally cause a problem other than the noise.

• If the gears are too tight however, you will generally have a fairly loud “whining” noise and you risk irregular wear to components like the gears, cam bearing, and the bushings in the cam cover.  eliminate the clicking, and have a slight whine, do the following:

• When the correct cam and pinion gears are used, there will be a slight whine and you’ll get a long service life out of the components

• Pinion gears are color coded with a paint dot to indicate their size, although these gauge pins will allow you to verify their size (especially important on older/worn components or if the paint dot is no longer visible)

How To Use Tool:

1. With cam or pinion gear clean, hold gauge pins in place with a rubber band. Put each pin in opposite sides of the gear.

2. Using a quality micrometer, measure the distance across the pins.

3. Match your micrometer reading with the chart shown below. Use the correct cam gauge pins
and the correct chart for your bike’s year. 

Example:

• You have a 1976 shovel- so make sure to use the 0.105” gauge pins and look at the correct chart on the back of this sheet for your bike.

• The cam gear you are checking measures between 2.7675 - 2.768

• The ideal pinion gear you should choose would have a red paint dot on it.