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I recently bought a older yahama 250 dirt bike and cant get it to fire the spark plug?


the motor is a newer motor say 1980 ish it dont have points but it does have small squarish wire packs ,when i kick it over i get a current out the wires coming out the side of the motor,,,,how do i get it to run ???some 1 told me i need a black box a spark amplifer???then some 1 else told me no that ant true im lost on this 1 and need any advice i can get

You have electronic ignition I take it? No spark to the plug? They have the pickup (instead of points) those wires go to the "ignitor box" which allows current through the coil.. Any one of those parts can fail. Do you have an ohmeter or a continuity tester. The pickup coil is tested (with wiring unconnected) for a short or an open circuit(make sure you don't mistake readings on the ohmeter). Next check the coil for a short or an open winding. If all ok so far it's the ignitor box. You can check those too with an ohmeter but it's a little more involved. This assumes all wiring is good.Maybe a Yamaha mechanic will come by who knows the subject better.
Here's a website for Rick Siemen mentioned above.
http://www.off-road.com/dirtbike/columns... Source(s): http://www.off-road.com/dirtbike/columns...
change spark plugs
had to recently buy a new coil for my harley. are you getting 12 volts to it? if you are but get no spark then it is your coil.
first get ashop manual,it will have a trouble shooting guide for that bike.You may need a coil.or maybe just new plugs.
You dont get 12volts on a CDI system. The 'black box is silver. I have 1980something YZ250 but havnt had any time to look at it.
it does have an ignition coil though, probably specific for that bike.Do a search for Rick Seimens, (think spelling is right) He was dirt bike Mr. Know It All in the 80's, living in Mexico now but has a website. (think its called 'Dont Ask')
Another thought,
If its a street/trail its a DT250, they came with points on early ones and CDI on later models. You can get service manual from Haynes for it but you'll have to look it up
better fire urself.
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