Want to convert from points to electronic ignition on 1974 9.9 johnson outboard using nova or nova2 ignition modules. Has anyone done this and how successful was it?
Maybe it will help, maybe not. No, I haven't tried it. But I will say those motors had a host of problems, other than the ignition. My personal guess is that what you are contemplating won't do what you are expecting. BTW, what are you expecting anyway?
I have installed dozens of the Atom modules when they were available the Serria Marine. The duck hunters loved em as quick starting, great idle as most of the armature plates was worn, quick throttle response and cheap too.
I use the universal ignition modules instead of nova11.very impressed they work great. Very easy starting smooth low idle and quick smooth high throttle.will put points and condensers in the garbage from now on.
Here is the problem I think you will have. You have the low tension magneto that use that extra coil under the flywheel. And those flywheels have 2 magnets in them and I believe the Noav 2s work with only one magnet. The ATOM or Nova 2 work better for the older style magneto that had the coils under the flywheel. I have had good luck converting those motors to the newer style OMC Cdi ignition. If you can find a complete one you can retrofit it. That also.solves one of the bigger problems on those motors. The poorly maxhined magneto rings.
It is supposed to work on the 9.9 pull start that has 1 coil and 2 magnets.the 1 coil sparking cylinder 1 from 1 magnet and then the same coil sparking cylinder 2 from the other magnet.it may be that is what you have and it isn't working.you may be better of doing the cdi conversion like flyingscott stated.
Going back with new points/condensers for now. These earlier 9.9's. (74-76) had a jumper coil that sent a voltage to the 2 secondary coils mounted on the side of the powerhead. The + side of the nova chip was connected to the blue wires. One from the jumper coil and one to the secondary coil. - side of chip was grounded. Had excellent spark for 5-10 seconds when the electric start was fired then nothing. There is no charging system on this motor.
Yeah its to bad there isn't a way to make them work on that model.that's probably a more accurate statement of the one coil under the fly wheel than what I was saying. They possibly may work but you would probably have to loose the electric start. Might not be worth it if it did work that way.
ricklum;n10749678]Yeah its to bad there isn't a way to make them work on that model.that's probably a more accurate statement of the one coil under the fly wheel than what I was saying. They possibly may work but you would probably have to loose the electric start. Might not be worth it if it did work that way. Can't have a battery hooked up with nova11
I’ve converted a few to the later CDI style with good results. However, to do it right, it helps to have the cylinder head and exhaust cover from the later motor, too. The plug angle changed, so the head is needed, and the exhaust cover has the bosses to mount the power pack. It also has the telltale outlet, which is nice to have.
I found that replacing the "#47 bearing, ignition plate support" as described in Leroy's Ramblings here https://www.leeroysramblings.com/Johnson 9.9_15.htm did help. You still need to get the points perfectly clean and adjusted to exactly the same gap - with that it will have good ignition.
Hi Ricklum.
I'm the one who installed the electric start. Purposely omitted the charging system as being more costly than it was worth. I was wondering if I wired the nova chips in wrong. Negative side was grounded and the positive side was wired to the coils.
It now seems conversion is the least of my issues with this 9.9. Found the armature plate bearing th ave a crack in it. Plate is a little loose laterally. Ignition is good with strong spark from both coils. Head gasket also had to be replaced due to impeller failure in the test tank. That problem didn't show till after the impeller was replaced and was underway on the lake. Motor shut down and wouldn't run above idle. A mixture of issues. Almost unscrewed the clamps and deep sized the motor. Once it's right again I'll probably sell it to feed my big boat.
I think u had them wired correctly some motors work with negative ground and some with positive ground. If they don't work one way than you simply switch the two wires on the module end. It is probably the electric start interfering with modules. I hope they are not wrecked from that
Yeah I believe your right about that it,shouldn't be connected to ignition at all. What about the kill switch would it be connected to the electric start.
