72 ciao NO SPARK

My 72 ciao just quit on me. It has no spark at all but all the lights and horn work fine when I peddle it. I looked in the inspection hole and the points gap is right and are opening and closing. All wire terminals were cleaned and tightened. I was going to take the ignition coil off complete with HT wire and take it to a shop for testing before pulling the engine.Maybe I'll need points and condenser. Last time I ordered parts they took 7 weeks to arrive . Any advise would be appreciated. thanks bruce

Re: 72 ciao NO SPARK

Hi there, I would clean the points as FRED`S REPAIR GUIDE reccomnends, also it won`t spark if the rear light is burnout... Doug D.

Re: Parts

Bruce:

Vespasupershop.com has all the parts you need, plus knowledgeable help from Fabio.

Jim

Re: Search

Use the "search" feature here to look up all posts under "vespa" or "vespa ciao".

Jim

Re: 72 ciao NO SPARK

Sounds like maybe a fouled plug, why pull the engine?

Re: 72 ciao NO SPARK

well the spark plug is fine, I have 3 others. I'm trying to find out if the HT coil is ok but can't find a shop that knows how to test it. Anybody know if you can test it with a multi-meter. The condenser could be at fault but removing the engine and flywheel is the only way to get at it. I tried cleaning the points but still no spark. thanks for everybodys input. bruce

Re: 72 ciao NO SPARK

Ron Brown /

Bruce,

I posted this some time ago. It is generic instructions for testing a points type ignition system. Following that is how to bench test a coil.

If you have a vom, check the ignition components as follows:

Disconect the wires from the points. One of these wires goes to the magneto ignition power coil. You should read a low resistance to ground on this wire, 1-2 ohms.

Another wire goes to the condensor, read this to ground on RXMAX, that is your highest resistance range, the needle should kick, then settle down to infinity. Reverse the vom leads, same thing should happen.

Another wire goes to the ignition coil primary, this connection is also connected to the kill switch. Disconnect the kill switch wire only from the ignition coil, the wire to the coil should read 1-2 ohms to ground.

From the wire to the kill switch, to ground, you should read infinity with the switch in "run" and 0 ohms with the switch in "stop".

Connect the vom from ground to the wire terminal on the points and make sure they are 0 ohms when closed and infinity when open. This seems dumb, but sometimes points that look clean do not connect.

Re-attach all of the wires to the points. Disconnect the wire from the points at the ignition coil. Measure this with the vom, it should read near 0 ohms. If your meter is sensitive enough, you should see a slight deflection of the pointer as the points open and close.

With the vom still attached and set to about 12v DC range, spin the motor by hand. You should see some deflection of the meter needle.

Pull your plug (spark, that is) and make sure the piston is at or very near the top of it's stroke when the points open.

Re-connect the coil wire. Measure from the plug cap to ground, you should read 5-15k ohms. If this is infinity, unscrew the plug cap from the wire and read through it. This should be 5-15k ohms, if it is open, replace it, if greater than 15k ohms, it may still work, but replace it with a paper clip for test starting then re-install it after you get the ped running.

Read from the end of the plug wire to ground through the coil, you should see 1-5k ohms. If this is infinity, the coil is bad.

Lastly, using the ohmsX1 scale, verify that all of the grounds really are.

None of these tests are guaranteed to indicate a problem, especially where you read coil resistances and they seem ok. Substitution is the best test here.

Coil testing:

To test the coil, connect a spark plug from the plug wire to coil ground, connect an ignition condensor (any will do for this test) between the points terminal and coil ground. Connect the negative of a 6V battery to coil ground and touch the points terminal momentarily with the positive lead. This should give you a spark at the plug.

Hope this kelps,

Ron

Re: 72 ciao NO SPARK

Ron Thanks for the info. I'll see if I can check this. They make things difficult when the points and condenser are inside the engine. Let you know how I make out. bruce

Re: 72 ciao NO SPARK

Ron Brown /

Bruce,

Most of the connections to the points and condensor can be accessed at the end outside the flywheel.

Ron

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