200x backfiring

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I just bought an '85 200x which was just rebuilt last year. The guy said everything is fine on it exept for the valve clearance, which he said was an easy adjustment. He said that is why it is backfiring. It backfires mainly when engine braking, acceleration, and starting. Is this what the problem is? What are the valve settings? He said they were .400 and .600 but I'm just checking.
Thanks

[jason200x]

.003 on both of them

[plkmonster2]

Is that hot or cold? I've never really known that part.

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it does it no matter what temp the engine is.

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lol I sound like an illegal immigrant ^^^

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Can someone plz second jason's answer?? Just want to be sure. The person I bought the bike says its .6 and .4 mm's and there. Jason is saying its the equivilant of .076 mm's which is a huge difference. Its for an 85'... anyone??

[samster143]

clearance is .003" adjust when engine is COLD!