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i really don't mean to sound like an assh*le, but your sense of where the sound coming from "might be" untrained and lacking experience.
most people who can hear parts of a motor wouldn't ask for assistance /what to fix.
step 1 - get a mechanics stethoscope (great $5 tool), you can use a screw driver but get the stethoscope its better. probe for sound around the motor, to be accurate this skill really comes from experience.
If you think the sound is coming from the chain, remove chain tensioner, check for proper operation.
if OK then remove the valve cover, check ALL 3 chain guides for abnormal wear..
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