sweetpea
100cc
That seems very low! Most ignitions operate in the 4.8-6V range. You should be seeing a touch higher. Is that SF regulator adjustable (they normally have short out pins on the side that move the voltage up or down if it is adjustable)
I'm not a DA ignition guru though (3W is a different story). I do know that one of my 3W ignitions ran like crap and would either wouldn't start or would die all the time because a battery wasn't giving it enough voltage. 3W's you can run a 7.4v battery straight because it can take over 8v. My MPI regulator puts out 4.9v for the DA ignition I have on a 3w motor. I also have a Cactus aviation replacement module which is a like an RXCEL that has a SF 5v regulator on it and it works fine.
I would really try a new battery that gives you 4.8v that doesn't need a regulator.
I'm not a DA ignition guru though (3W is a different story). I do know that one of my 3W ignitions ran like crap and would either wouldn't start or would die all the time because a battery wasn't giving it enough voltage. 3W's you can run a 7.4v battery straight because it can take over 8v. My MPI regulator puts out 4.9v for the DA ignition I have on a 3w motor. I also have a Cactus aviation replacement module which is a like an RXCEL that has a SF 5v regulator on it and it works fine.
I would really try a new battery that gives you 4.8v that doesn't need a regulator.