Timing light with advance feature

But you need a place for the light to be set at the "zero" point from.

If you want to be sure, find TDC with a timing wheel, rotate the engine to 28*, reinstall primary cover and see if it agrees.
 
tomspro said:
Anyone used one of these?

I do not trust the one inside primary on my commando to be accurate.
Click to expand...

A timing advance control is of no practical use because there is no TDC mark, therefore you can't....

"....simply set the advance on this timing light and align the timing mark to the TDC indicator on your engine...."
 
tomspro said:
Wouldn't it be easy to mark TDC on rotor before using it?
Click to expand...

You still have to find and mark TDC accurately.
Therefore you are back to using the timing wheel in which case there's nothing to be gained over checking the accuracy of the timing scale.
 
Guess I am not understanding the TDC/wheel connection.
A wheel does not help finding TDC, correct?
If I need a timing light anyway, why not combine wheel function into it and find TDC before the process as usual?
 
tomspro said:
Guess I am not understanding the TDC/wheel connection.
A wheel does not help finding TDC, correct?
Click to expand...

A degree wheel is used is used in conjunction with a piston stop to find TDC. Once TDC has been established it is a simple matter of using the degree wheel to check the accuracy of the timing scale and then strobe in the usual way.


tomspro said:
If I need a timing light anyway, why not combine wheel function into it and find TDC before the process as usual?
Click to expand...

What exactly do you mean by "wheel function"?
 
You use the piston located at TCD to position the degree wheel.

You roll the engine and attached degree wheel back into the 28 degree area, noting the exact amount of angle the degree wheel moved.

You replace the degree wheel with the outter primary cover with the observation port open so you can see the scale.

IF the mark on the rotor is pointing directly at the number of degrees you moved the piston and wheel, then your rotor, scale and piston are all synced, so when you use the timing light on the engine, the strobe numbers are accurate.

I have no clue why the timing light would have an advance feature incorporated into it...
 
Timing marks on any engine are bullshit. I use the soap bubble method to find TDC, set the timing, then strobe it with the degree disc on the end of the crank. If you get the ignition advance wrong, your jetting will be wrong. One affects the other. Too much ignition advance can create the same symptoms as the jetting being too lean. But having said that, I always jet to suit the ignition advance I am using, which I vary to suit the fuel and the engine's comp. ratio.
 
Got a degree wheel!
Will check timing when I get a light.
HF one prolly crap anyway.
 
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