lucas rita double pole coil ohms

could somebody tell me what ohms coil i could use on my commando at the moment i have lucas rita with two 6volt coils and i want to change to a single coil with twin HT leads maybe from a japanese bike cheers baz

you need at least 3 ohm and have used up to 4.6 HD style BUT the rita does not like a single coil unless it has a very good heat sink. IMHO you are better off using the stock twin coils. the rita keeps the coil turned on for to long and will over heat them.

bill said:

you need at least 3 ohm and have used up to 4.6 HD style BUT the rita does not like a single coil unless it has a very good heat sink. IMHO you are better off using the stock twin coils. the rita keeps the coil turned on for to long and will over heat them.

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I like your answer as I'm using stock Lucas coils with my RITA. I don't follow your logic however as the RITA powers and fires both coils at the same time - every BTDC both sides. How then would two coils benefit compared to single.

as I stated the rita keeps the coil turned on for far to long which in turn has a tendancy to over heat a single twin tower HD type coil. this coil has no way to dissipate the heat (been there done that)some of the other after market coils tell you that they MUST be bolted to a heat sink. as to the stock coils they have a MUCH larger surface area and will dissapate the heat much better than a stock or aftermarket HD style coil. I got away from the rita for this reason along with the Hugh current draw which IIRC is approx 3 amps where as a tri spark is less than 1 amp at idle per stephen kelly.

illf8ed said:

I like your answer as I'm using stock Lucas coils with my RITA. I don't follow your logic however as the RITA powers and fires both coils at the same time - every BTDC both sides. How then would two coils benefit compared to single.

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Got it, thanks. Will stick to my RITA and stock coils. It's been working since 2002 that way.

yes thanks for the info i will stick with my standard lucas coils and rita setup its completely reliable and i want to keep it that way cheers baz