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Old 06-21-2018, 03:53 PM   #1
tew45
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Harley Davidson
 
Join Date: Aug 2007
Location: North Texas
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Default simplified HD timing

I have made a mechanical stop to screw into the spark plug hole to stop the flywheel at the forward and reverse marks. It really helps for you do not have to watch through the flywheel cover hole while making adjustments. A battery and flashlight lamp can also be used to indicate exactly when the points http://www.buggiesgonewild.com/editp...&p=1514184open and the stop will time a Harley in a short time.
Timing is fixed at 25 degrees before and after TDC. This figures to be 25 degrees = .173 inches piston travel before TDC forward and reverse measured from the piston top to the spark plug seat (top of the head).

The instructions below and the photo tell how I made my timing stop. It works perfectly but
Care must be used to protect the top of the piston. I am looking for a ¼ inch plastic rod to insert in the bolt to help to prevent damage to the top of the piston.



You can also drill the end of the bolt and insert a plastic rod to protect the top of the piston. The distance of extension of the 3/8th bolt is approx. 7/8 inch. From the spark plug seat to the bottom of the bolt is approximately 1 5/8 in.
I welded a ½ inch washer on top to make it easier to screw in and out by hand or hang on the wall.

A slip fit rod epoxy glued into the old plug at the proper distance will work as well. This tool is certainly not needed unless points and point plate is removed or moved. Once a year is probably all you would ever need to use it. It is just a gadget that I wanted to make to use in the field to check timing when I have problems. The time it took to make it will probably even out with time saved in around 5 years or so but I still like it!

Timing with the timing stop

Install the timing stop in the plug hole when piston is at top dead center. The timing marks will be close and the point plate can be adjusted by rocking the crank back and forth while looking through the hole in the cover. With the points set at .022 inch the point plate can be moved to allow the mark before and after to be seen through the hole equal distance before and after TDC. After the point plate has been adjusted, remove the timing stop, turn the crank shaft, and install the timing stop when the piston is around BDC. Then turn the crank one way and adjust the points to just open. Turn the crank the other way and see if the points just open. If the points open exactly when the piston touches the stop in both directions you are finished. If not, adjust the plate to allow the points to open equal distance before and after TDC then check point gap and adjust if necessary. A battery test lamp with leads will also help determine just when points open. The cart will run at top speed when the ignition timing is perfect.
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Old 06-21-2018, 03:55 PM   #2
tew45
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Default Re: simplified HD timing

Please make a stick of this if it makes sense!
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Old 06-22-2018, 08:55 AM   #3
AKAMick
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Default Re: simplified HD timing

This needs to be a sticky. "approx 1 5/8" ?
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Old 06-22-2018, 08:58 AM   #4
jjb366
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Default Re: simplified HD timing

i build one last year and it makes it so easy
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Old 06-22-2018, 06:34 PM   #5
Iron92
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Default Re: simplified HD timing

Does anyone make these and sell?
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Old 06-22-2018, 08:01 PM   #6
tew45
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Default Re: simplified HD timing

No! In the 60's we used an adjustable timing tool to set timing on our racing bikes. The timing stop I make is just a knock off of this tool just made just for the HD/Columbia point system. I made my stop a little elaborate since I used it a lot on friends carts. The stop can be very crude like a reamed out spark plug and an epoxied in rod of the right length.
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Old 06-25-2018, 08:59 AM   #7
Lochlin
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Default Re: simplified HD timing

Hey mods, can we sticky this?
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