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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Sudden stall then no spark

Hi, Chad and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose, check for spark leakage in the dark.
6. Faulty ignition coil, pick up coil, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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YAMAHA YZ450F Owner Service Manual
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Jun 03, 2014 | Yamaha YZ 450 F Motorcycles

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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

1 Answer

Bike turns over but no spark with new plug in and fuel is going to cylinders

if the engine turns over with no spark and you put a new plug in thenlook deeper, ignition coil/armiture/magneto. this coil will have to create a charge to produce a spark if it does not work correctly then you will have no spark. also another cause of this would be the ignition switch. make sure the key is activating the ignition coil.

Aug 18, 2011 | Honda XL 1000 V Varadero Motorcycles

2 Answers

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.

Jun 03, 2011 | Yamaha Freedom Topper Motorcycles

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Weak spark 1973 yamaha rt1 i don't see a spark

Problem could be a few different things. Not sure on all the ignition parts on that bike, but could be a bad sparkplug cap, wire, coil or magneto. My recommendation would be to first take the spark plug cap off. Trim a bit off the wire and put the cap back on. Over time spark plug caps move quite a bit and wear out the wire inside cause a weak connection.


May 26, 2011 | 1973 Yamaha DT 360

1 Answer

As there is no ignition switch on a Villiers powered James m/c what is the correct way to stop it

Hi, most of the older bikes like the villiers used flywheel magneto ignition, where the ignition coil was inside the flywheel normaly you would have a metal engine stop ontop of the engine this was bolted to the cylinderhead and would bend or was hinged you would bend it down until it made contact with the spark plug and it earthed out, this would kill the spark.
As so with the external ignition coil, a single switch was used on the handlebar, with a wire from the coil, at the points wire This would then earth out when pressed stoping the engine

May 13, 2011 | Derbi Senda R 125 4T Motorcycles

1 Answer

My 2002 duece has no spark................any ideas

You need a voltmeter and check cdi ignition box for output.if you have voltage there,next you need to check coil resisance.these days with solid state electronics you need to elemenate things one at a time.CDI being most expensive,then stator under flywheel,and then your coils.By the way if there is no voltage present at out side of cdi then you have a stator problem,if everything is working properly up to coil then coil has gone can coctact dealer for all output voltages or google this problem and see what info you can come up with.this isn't the easiest thing to trouble shoot.If you have no electrical exsperiance then you might want to take to trusted mech.Because to just start replacing parts can get very expensive.

Mar 06, 2011 | 2003 Harley Davidson FXSTD Softail Deuce

1 Answer

Like I said in my posting I replaced the whole electrial system dow to the lights. Every thing is new Yamaha OEM. I get an initial spark but nothing after that. I press the starter and in catches for a...

Hi... Problem with your bike...Let me help you.... I see you have , one spark then nothing... well I suggest to look first at your condensor and your electronics Ignition Box... Make sure your battery is full charge.. when you try to start the bike several time
it take so much current on the battery, then you dont have enough
voltage to innitiate your spark correctly to your spark plug ... if it yellowish or redish it no good, but if it blue spark it correct..
also check the voltage from the magneto see if it gave you the right volgage to the coil when you start..
the battery is use only to start the engine till the magneto take over
The right voltage it betwen 12V to 14Volts when the motor is running ...

Oct 18, 2010 | 2004 Yamaha TW 200

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

Sep 20, 2009 | 1997 kawasaki ZX-7R

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