Fitting a Tri-Spark MRK-0001 to my Dommi 88 . I have no wiring on the new build at present and wondered what is the best connection to use Negative or Positive ? Is there a preference ? Also the installation instructions state the fully advanced position should be 38 Degrees BTDC where as all my books say 30 Degrees BTDC . I can only assume the 38 Degrees is aimed at a different engine ? I will be fitting a new 12v Stator /rotor just for your info.
My guess is 38 degrees is…
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I had the same dilemma when…
I had the same dilemma when sorting my bike. So far as I can tell, and I'm very new to this game, the only real benefit for going negative earth is to use something like the Motogadget wiring system and build your own loom. Which is what I did because I have always wanted one and the opportunity presented itself. I'm very happy with the result and will be rebuilding my prototype harness over the winter as it needs some changes
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The answer is..................
......is on my web site, under info sheets. A O Services.co.uk If/when you sell, the new owner will expect Pos. If you are used to Neg then one Pos is likely to cause petty aggravation. Pos earth will show a little more corrosion especially around the Pos battery terminal, not a big issue. If you wire with the standard British wiring Lucas/Rists sytem then only the earth wire will change colour.
Negative earth will give you a greater choice of Indicators and LEDs and any other widgets you might want to fit.
The Fully advanced ignition point is dependant on the engine so follow engine advise.
PS A bike this simple can be wired in a day or two-you don't need a whole winter!
Fit ALL the electrical bits BEFORE fitting any wiring.
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My guess is 38 degrees is for a Triumph 650 or 750 twin.