Greg,
What negative effects are there to running my dual plugged Comet with the BTH at 35°?
I just got it running and have advance set at 26°.
Jerry
I am pretty sure the answer is none. Unless you are using a dyno to set the timing it will not matter. Set it on your favorite number and ride.
We have talked about this before on the forum and there is, so far, nothing to be done about it. BT-H and Pazon are using industry standard chips that are not easily programmable for advance. It is set in the chip. It can be turned off and there can be some small preliminary adjustment, but I don't think it is programmable in the ordinary sense of the word. There are fully programmable ignitions like the MSD 4217 that can be used, but it is a lot of work on the dyno to set them up.
If someone will take the time to strobe their engine they can get an idea of the advance and retard. I did this to my BT-H on the racer and I could not find any. I did not order it fixed, but the mark did not move at different RPMs, which was fine by me.
Twin spark ignitions on the street tend to provide better starting and are less prone to detonation. Not something I would bother to change from a single spark for, unless I had a specific problem that the twin spark would address. The fact that they can be run at lower timing numbers does not mean that they have to be run at lower timing numbers. The lower you can run the timing is evidence that your combustion process is more efficient. If you can pick up .3 BHP by running 10° more retarded, you can simply go back to your original setting and give up the .3 BHP.
I ran at 19°, but I started and raced it at 26° before I got to the dyno. The difference in timing did not change my standing in the races. The bike did run much faster by the end of the season with all my adjustments, but it was mostly the improvement to the Girdraulics that cut many seconds off to my lap times.
David