87 CR80R Not Running

 

I have a 87 CR80R that not running.  I lent it out to a friend to let his kid learn to ride and he gives it back not running.  Of course he said he could never get it running but it did come back with a new tire.  I have cleaned the carb many times, changed spark plug, changed the coil, and changed the reeds.  I can crank it and it turns over freely, it even gets the pipes hot and pops out some smoke.  What should I try next, any input will help.

Id test the compression. I was working one on for a friend and his was doing pretty much the same. It'd start to puff out some smoke, if you kicked it fast enough. After a new top end, it fired right up.

Have you tried pop starting it? If it starts, your top end is tired.

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