- Joined
- May 28, 2003
- Messages
- 2,590
The DD graph shows the apparent advance range.
As Dave says;
Therefore, when set to a 'full advance' figure of 31 degrees (for Norton) according to the graph, the Boyer should retard 19 (crankshaft) degrees, full retard would then be 12 degrees!
However, according to the numbers on the NSW page, there's 24.7 degrees of advance/retard between 1000 (6.3 deg.) and 5000 RPM (31 deg.)!
Although the actual NSW advance/retard below 1000 is unknown, if it continued to reduce along the approximate line of the curve then I think it would probably be somewhere between 0 and 2 degrees at 'kickstart' RPM.
I'd suggest to not be to reliant on a single spot sample. The accuracy of measurements on a single sample is not very convincing except for that exact device.
In my article I show 4 samples of norton boyers to demonstrate the typical RANGE rather than a fictitious standard...
Setting a bike up based on the "standard" is not helpful. Each mediocre device must unfortunately be set up based upon it's own sloppy tolerances.
It is entirely possible that MR kick back device is closer to my orange line rather than the blue curve being closer to the NSW device.
Lack of production constancy is the main contributor to a lot of the application confusion for the less technically educated. (does not mean stupid)
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