Just Google 1988 Honda TRX-200SX shop service manual, several sites will pop up, look for a download version be careful when it says free not worth the risk unless a well known forum. If you see tradebits.com that is a good one usually 14.00 and it will be an authentic Honda shop manual. You pay, download and you have everything right in front of you. It will take you step by step on diagnosing a no spark condition and will have the complete wiring diagram. I tried the link neo posted but "could not find page comes up". The 14.00 you will spend will save you at least that much in not needed parts.
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