If I have current through the spark plug wire, but the plug still won't spark, what could the problem be?

Question:
It's a '71 yamaha dt 250. It's a new spark plug and I replaced the stator and ignition coil with used parts. I even tried a couple different spark plug caps and got the same results.

Answers:

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Everything that ever goes wrong with anything is either
a)Bad Ground
b)Carb Adjustment

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If that dont fix it,,get a Bigger Bike.

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Seriously now,,,Magnetos wont produce enough juice to spark unless
a)the Condensor is Good
b)The Points are CLEAN
c)The Ignition Timing is set properly

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Yes,,that's a Fact of the nature of magnetos,,
They Will not "Fire" if they get too far out of time.

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That's why they quit firing when they shear a flywheel key,,,and flywheel slips out of phase.
NOT merely because ignition timing goes wacky w/ flywheel outa position.

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Case in point:
Briggs & Stratton Lawnmower Magnetos function "Identical" to motorcycle magnetos.
But Their flywheels Do NOT include the Points Cam.
B&S Points are operated by a Cam ground into Crankshaft.
You can REMOVE the Flywheel and their Ignition Timing & Points Opening/Closing remains Unaffected.

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But Shear a Flywheel Key and allow Magnet/Coil Phasing to shift when Flywheel slips outa position,,,,
NO SPARK is the result and engine dies.

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Battery powered ignition will fire "anywhere".
Mags Wont.

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They'll Make enough juice to Feel,,,but not enough to fire a spark plug,,or not enough for proper ignition.

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Make sure Timing is set close,,,and points are clean

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You can use an ohmeter to check the Condensor,
and also a flashlight or transistor battery & a Voltmeter.
Wont tell you if it's Right/Correct/GOOD,,,
But it will tell you if it's BAD

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You may have other probs,,
But I'd start by verifying those things
and at least eliminating them as variables

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Good Luck with it

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Ground the plug wire and crank...then check it for a spark... should it give a momentary spark and then quit again you will need to replace the ignitor or if it has old style points and condensor pull the flywheel and replace...

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you have a bad sparkplug.

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Did you try replacing the cables? Just because you have current it doesn't mean you have enough for the spark plug to spark.

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Ignition switch.
Engine kill switch.
Points and/or condensor.
Sheared woodrift key (it's on the crankshaft to keep the flywheel from turning on the shaft).

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Good answers so far. My bet would be the plug, first. If it's carboned-up, that can bleed off high voltage to ground pretty quick. If it's a resistor type plug, the internal device in the plug tower could have opened. Cheapest fix first: clean the plug. Next, replace it. Third, the plug wire itself. Only after these checks would I go deeper into the secondary (high voltage) system.
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