hit n miss coil start?

[brewzalot]

Cousin bought a non running 2.5 hp Associated hit n miss engine... he thinks the magneto is shot.
Was wondering is there a way to use a battery and a Cub tractor coil to start it, just to see if it runs?

thoughts?

thanks
Tim

[staninlowerAL]

Here's a wiring diagram that I picked up from a guy who was running engines from a battery at a HIT-MISS engine show a few years ago. Maybe
this will help.

[birddog]

It's probably possible, but how depends on whether it's a spark plug or igniter fired. If it's spark plug you will need some points or some other sort of contact to get a spark. Depending on the type of mag, you may be able to use the points in it with a battery and coil. If it's an igniter it will depend on whether the contacts are normally open or normally closed.

[brewzalot]

It's probably possible, but how depends on whether it's a spark plug or igniter fired. If it's spark plug you will need some points or some other sort of contact to get a spark. Depending on the type of mag, you may be able to use the points in it with a battery and coil. If it's an igniter it will depend on whether the contacts are normally open or normally closed.

He said it didn't have a spark plug, and from what I saw the mag was up front but what made the spark(points?) was a separate unit towards the back of the engine. I will pass your info on to him.

Thanks for the response Birddog,
and the the diagram Stan

Any other input is greatly appreciated.

Will keep you posted if he/we get it going.

[staninlowerAL]

The parts I have are a relay marked AAMP of America 40A/30A 12VDC, RELAYN 707. It has 5 blade terminals marked per the drawing. There is also what looks like a blue capacitor with a wire out each end and marked S A R A 2.2K250V I got them from the person who provided the wiring diagram and intended to try to run a one cylinder WISCONSIN engine with it but have never found a replacement intake manifold which is broken.

[RonT]

I have a couple of hacks for the Webster low tension mags that use the internal ignitor points.
I use rare earth magnets on each pole and bend a u shape mild steel strap. Even weak coils jump to life with this.
You can also use an automotive AC coil in line with a 12 volt battery using the internal points - gives a nice fat spark.

I mostly use these to evaluate engines or sell barn condition engines - running engines bring more money.

Ron

[John *.?-!.* cub owner]

I no longer have the diagram, but I have seen the guys with the low tension mags (ignitor type, no spark plug) Use an old automotive air conditioner clutch coil for the spark. It seems they ran from hot side of battery to a switch , then to one side of Air cond. coil. other side of coil went to ignitor. Other side of battery was frounded to the frame of the engine.

[brewzalot]

thanks John and Ron,

It certainly looks like it's possible.

[RonT]

When using the AC coil, the ignitor points are the switch. You just hook the coil in series with a 12v battery through the point terminal (with the low tension mag disconnected) using the engine block to complete the circuit. The rocking motion of the magneto rotor momentarily closes the points then opens them. This starts the current flow through the coil and points and when interrupted, yields a nice fat spark as the magnetic field collapses.

Ron

[cub&catman]

you can use a 12 volt coil and battery to run your engine. I ran my associated and others this way. You hook the positive wire up to the + side of the coil and a wire from the minus side to the igniter and a ground wire from the battery to the frame. This is low tension only. A spark plug requires a hot coil like a model T coil with a make or break system as this is high tension. I ran engines both ways all the time.

[birddog]

A lot of good advice, but as I said earlier, you need to know if the igniter is normally open or normally closed. To use a battery and coil it needs to be normally open, other wise you will just kill your battery and or burn up your wiring.

[cub&catman]

The ignitor points are supposed to be held open by a spring. When they are tripped or snapped shut and opened quickly they cause the spark to happen for ignition. If they are always closed they will burn the wiring out.

[cub&catman]

You should be able to tell if your ignitor points are in the open position by taking out the two bolts that hod the ignitor in and removing the assembly. They should be open.

[brewzalot]

He finally got it going yesterday with a cheap auto store coil and his 18 v cordless drill battery hooked up as you fellas suggested. He switched to the drill battery after the 12 v one he was using went dead, and it fired up on the first try. He also got the magneto fixed today at the Rock River Thresheree in Edgerton Wi. where a gentlemen there just put it on what he called a magna charger.

thanks all for the tips and replies , he was grateful for them.

tim