No current to spark plug

The switch suppose to ground the coil for the spark plugs, try to remove the kill switch and verify the continuity of the switch contacts.

Try a new plug, If not, the pulser coil in the LH motor cover is the first to check. take a resistance test of the pulser where the wires come out of the motor (Unplugged). Forget the 3 white, they are only for charging, The other 4 are the pulsers, 2 for each. I don't have the color codes, But they should both have the same resistance reading, 100~330 ohms. If one pair is wayoff from the other, That coil is bad. Ignition coils under the tank & black boxes, VERY SELDOM go bad.

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The following site has '97/'98 and 2002 xv250 manuals. Please rate my answer.
www.carlsalter.com/motorcycle-manuals.asp

hello, you should be able to go to yamaha.com they also have a atv forum, and a motorcycle forum, you can put your serial numbers in and it will show you this info very quickly. friend of mine bought a 2001 atv, come to find out it was a 2000 model. he went to their site and fond this info out...

first thing to do is to drain oil from your motorcycle use wrench 17(size may vary) to open the bolt under your bike and place a drain bucket under it, then remove spark plug using spark plug remover, as for the filter you can use a cross screw driver to remove the air filter, once you replace the spark plug and the air filter let the oil subside for about 3hrs, then return the bolt and place new oil, i dont know if this help but i hope it will

Please rate this answer. Thanks!