honda atv ticking in top end?

hey i have a 92 honda trx250x four wheeler which i just bought. i noticed a ticking in the top end. i tightened up the timing chain, adjusted valves with a clearance of 0.004" and disconnected the decompression lever. still ticking. cant figure it out.... the quad runs pretty good but that ticking has me worried. let me know thanks!
 
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