Question about 2003 Yamaha YZ 250

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Very poorly CRF230F - No spark, will turn over but nothing

Have replaced CDI, Plug, battery everything. The magneto is the last thing to check I am told so I have taken that off. But.......I think I may have * * * * in that, I am sure it needs to be on to test it! Would it be easier to buy a new one. This would mean it being shipped from Canada or the US as the 230F is an import. Help!!!

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Their is a transistor, the magneto as how u call it carries electricity to the transistor, then the transistor to the ignition coil, and the ignition coil to the spark plug. And yes the magneto is the last to check and rarely see those things gone bad(but things are not made to last jajaja) unless someone opened it and didn't put back the wire correctly that why when u are fixing something u need to mark your wire no matter how intelligent u are, lot of people get the wires confused some connector fit in other places where their are not supposed to be connected, so if at first you market their won't be room for mistake and u will not be misdiagnosing

Posted on Jul 24, 2009

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Pulsar 150 wont show spark


Remove the spark plug, keeping the cap connected to the plug. Hold the threads of the spark plug to the cylinder head bolt.
- Lift the rear wheel, and give it one good hard pedal down as if you are kick-starting the bike.

IF the plug sparks at the tip, re-install the spark plug.
NO SPARK:
- Check the plug cap. I've replaced mine with a NGK Right Angle spark plug cap.
- Replace lead with Copper wire lead. (despite not noticing evident issues with the wiring)
- Check for spark again with the new lead and plug cap. That's all the electrical done from start of lead to the end of the plug tip.
- Still NO SPARK? Skip to [Magneto and CDI] DO NOT replace Magneto and CDI unless you do all the above. That way you have a clean sweep of any electrical related issues.

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plug wire--coil--ignition mod-cdi--batt or magneto may be bad-----time for some test-------procedures online

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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

What would cause no spark? the mower is a masport 8/02 two stroke. Will not start and I have changed spark plug and cleaned every thing but still nothing.


Your spark plug wire may be damaged, or your magneto may be too weak to generate a spark. You also have a kill switch wired to your magneto, and a condensor. I would start by cleaning the contacts of the magneto and then check the gap between the magneto and the flywheel. The gap between the flywheel and magneto should be .010". I would start by checking the kill switch wire for damage. If any damage is suspected, replace the kill switch. Next, I would have the magneto tested or replaced. Also, check all your ground wires for damage, or loose contacts.

When you are checking for a spark, you should have the spark plug installed in the spark plug wire as normal, but not installed in the engine. The spark plug base should be grounded to the engine while trying to start and checking for a spark. If there is a weak spark, this is probably due to a worn magneto.

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Honda XL200R was running great but leaked oil bad so I tore it apart and replaced the head gaskets and piston rings, put it back together now ive got no spark. The head lite comes on when I kick it but the...


well your magneto is fine(because your headlight works when you kick it over) I bet it is something as simple as you forgot to hook up a wire since you had it all taken apart. since your magneto is fine that just leaves #1 coil....or....#2 cdi box.....to find the coil just follow the wire from your spark plug to it....your CDI box should be mounted under the seat( make sure all the wires are hooked up ) and check again.....

Aug 15, 2010 | 2002 Honda XR 200

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No spark from CDI Unit. bike is Bug Jive 50. Motor cut out while riding, checked all obvious things, lights OK, Battery Ok


Replace the magneto/stator, CDI and voltage regulator/rectifier. Usually if one messes up they all go bad.

Jan 01, 2010 | Kymco Stryker 125 Motorcycles

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hi did you sort it as my 1981 yamaha xs 250 twin is not sparking but i dont now why

Sep 26, 2009 | 1981 Yamaha XS 400

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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

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?

Apr 22, 2009 | Poulan/Weed Eater No. Bvm200le 711482 24cc...

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