Question about 1971 Aermacchi Sprint 350

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  • Anonymous Jan 05, 2009

    I have a 93 ext 580 carbed, there's no spark from plugs,but have spark coming from cdi, to coil.

    Swapped coil from 98 550 cougar, still no spark, replaced stator, boots, plugs. The kill switch is broke, so we twisted them together, the two.

    What setting on the meter ohms volts??? and whats the steps to check the problems. thanks



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Posted on Dec 29, 2008


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Neon Plymouth 2000.Replaced the starter,the ignition switch,replaced the battery,relay started one time and then now nothing.Please help me trouble shoot.

Hi Susan , when you turn the key to the start position does the starter engage an spin the engine ? If yes , pull a spark plug wire an check for spark , do you know how to do that ? You can buy a spark tester at the auto parts store or stick a screw in the spark plug boot a hold it near ground .( metal on the engine ) Have someone crank the engine . Does it have spark ? If not could be the coil or crankshaft position sensor . Watch this video !

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What would cause a no spark situation on my honda rancher 350?

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I have a 1977 yamaha 440 exciter snowmobile with intermittent spark. The switch has 3 positions, off, on, and lights. i have checked it with an ohm meter and it appears to open. But I am confused...

If you are experiencing an intermittent spark, you may be having problems with the magneto / coil (ignition module) or CDI box if so equipped- that produces the pulses of high voltage for the spark plug; you may have damaged spark plug wires that are shorting out- check the resistance (using the Ohms setting on a multi meter) on the wires; and check to see if your ignition module is producing a strong spark...check the resistance on the primary & secondary coil. Or you can use an in-line spark tester- the tester is inexpensive and you can buy it at any diy auto parts supplier.

Mar 11, 2014 | Motorcycles

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Won't start!!!! Can u help trouble shoot to fix please

Hi there check you are getting a spark from the cap to the plug.Do this by removing the cap and holding it very close to the top of the spark plug then try starting it.You should see a spark jump across.
If that seems ok take out the plug and either give a clean with some wire wool gently or replace it if it looks old or is old!
Hope this helps ;o)

Jan 31, 2013 | Garden

1 Answer

Gentron pro2 6000p has no spark

With small engines, ignition is magneto. Four things can cause a lack of spark: (1) Faulty plug - try a new plug; (2) Bad, shorting, or disconnected spark plug wire - check for high voltage from ignition coil; (3) Bad ignition coil - check for low voltage at the coil input wires; (4) Magneto failure - the pickup coils next to the flywheel may be shorted, loose, or disconnected, OR the magnets on the flywheel may have lost their field or come out. I would troubleshoot this problem by checking and eliminating each of these possibilities in the above order. If all of the first three check out good; I'd have a mechanic check the magneto because this requires at least partial disassembly of the motor.

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Xt 500 has weak spark(flywheel magneto with ignition points).poor when cold and now won't even start.fuel fine.isolated ignition(magneto,coil and points).changed coil.points fine,resistance...

It sounds to me that you have done most all of what is needed. Just take some fine sandpaper to the magnets in the flywheel. After sanding, wipe it clean, then spray it with carb cleaner to remove any possible residue. Now give the magnets a spray coating of clear polyurethane coating. The flywheel will never rust again. Replace the source coil and install a new spark plug. A plug that is carboned up can lessen spark voltage. The last item is the battery. A weak one can rob power. Please rate my answer. Thanks.

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1 Answer

How does my 1939 evinrude work electric wise

Typically for small outboards.. that era and for many many years after.. use a Flywheel ignition System. a Magneto, Coil, Condenser and Points..

Most of those parts are located on the Magneto stator plate under the magneto "cap". Magnets rotate past the static coil.. hence stator..

The Magneto/Magnets rotate past the coil creating an electric current.. The condenser controls the volatage spikes or modulates the voltage directing the correct voltage to the spark plug. The Points open and close allowing the voltage when closed to travel to the spark plug at the proper time as in or during Compression Stroke / Power stroke.. Which is why timing is so important..

This is a very basic description.. proper operation depends on all parts being in good condition and the timing being set correctly.. good fuel and air supply.. not to forget a proper operating spark plug gapped correctly.

There are youtube videos (of course there is) on how to check the various components of early outboards..coil. condenser.. points etc..

Very simple system..performing a complex dance.

Hope this helps.

Best of luck

Apr 20, 2011 | Boating

1 Answer

No spark and dont know the settings on the coil or

Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when flywheel is rotated.
I just checked a dozen or so Stihl saws, 0.008 - 0.010" is the normal coil gap. Card stock is usually 0.085 - 0.095"
If you still have no spark after assembly please reply below and I will happily assist you.

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1 Answer

Bike wont start

hi buddy to check the magneto just find the wires from the magneto and test them out with a volt metre if you have nothing there must be the stator plate gone get back to me buddy

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4 Answers

Poulan Pro 200 Leaf Blower won't start. I have installed a carb kit with no results. The spark plug was wet before the new kit---it continues to be wet. I have tried a replacement spark plug with no...

Alright, remember that 2-Stroke motors are meant to do 2 things:
Break down, then Frustrate you.

So, here we go: (Electrical)

Rotor Magnets, Magneto (ignition coil), Spark Plug Wire, Spark Plug, Spark Plug Ground (Cylinder Head).

In that order!

Check your "fire" from the Magneto:

1. Check your Kill Switch. In other words, leave everything normal, and unhook it. Did she start? Kill Switch it is! Kill Switch/Wire comes from the Magneto (single wire/ground) to the Switch itself. So check that wire AT the Magneto (Is it loose and grounding out? Is the Kill Switch grounding you out where it is, because of crud, junk, or because it is touching the block when it is not supposed to?)

2. Check your Spark Plug Wire. Easy, unook it from the plug, stick your finger in, give it a crank (non-MultiMeter way). Did you get shocked? Then it ain't your Plug Wire and Magneto!

With a Multi-/Volt Meter, simply hook her up, and check for juice WHEN you pull the rope. If you got juice, it ain't your Plug Wire or Magneto!

Checking Spark the "normal" way: Grab the Plug with a pair of insulated pliers, hold the plug end against the cylinder head, and pull your rope. Any Spark? What color?

3. STILL no fire. It leaves: Magneto and Plug Wire.
Luckily, they are both in the same place! Tear your blower down, and check to see if the Magneto has slipped out of place (gap is WAY out), or if the Plug Wire has worn to the point it is grounding you out. While you are there, check your Kill Switch wire, to see if she is grounding you out then and there.

4. STILL no fire. That means: Magneto Failing, or Magneto JUNK.
Buy another one, replace it! (Or steal one from another junk Blower/Weedeater. These things are fairly standard, and easy!)
Or, Bad Plug Wire. Meaning she has failed out on you.
Wait......that means: Replace your Magneto! Lucky the things are built together right?

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