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1987 xl600 smoke and loss of power

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I have a 1987 xl600 with 6500 miles on it it sat for a while got it running but while riding constant throttle it loses half its power and smokes then all the sudden comes back running strong. I have been trying to find out where to start on it. I have heard there is a seal that goes bad in the bottom end but not sure where to start any advice thanks

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You need a good repair manual and to start by checking things the manual says can cause the problems the bike has. Without a manual you may not be able to fully utilize the advice on here.

Sounds as if someone told you about crank seals on a two stroke, that doesn't apply to your bike because it is a four stroke.

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black smoke or blue?blue carbs/maybe spark.blue valves or rings,could just be loose plug or bad or coil drpends my 650 was doing something similiar fixed in 1 hour by pulling carb cleaning jets and new plug

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