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I have an 1987 ST2. every now and then it coughs and splutters and blows smoke for a few seconds then is OK. Also stopping at lights the motor revs to around 2500rpm for a bit before settling back down to idle. What is causing this?
 

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I don't recall a 1987 ST2 but I sounds that it might be out of sync and possibly lean condition.
I'd start by checking the synchronization first (a hanging idle is most of the time likely to be caused by an out of sync situation) and then move on to a possible lean condition.
Is this 1987 model fuel injected or carburated?
 
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