I have yet to see a problem caused by unclean slides. That would most likely make them stick open and cause reving. Has the bike been left for a period of time unused? Say for 6 months or more? If so, then some fuels can evaporate in the carb float bowls and leave a varnish-like residue that can block off the tiny fuel galleries that feed the idle fuel circuits. Dismantling, and blowing out with compressed air can fix it but if it really badly blocked, using a fuel additive like Seafoam or heating the carb in a 50/50 mix of water and Yamaha carb cleaner for 20 minutes then washing in water and blowing with air will almost always do the trick.
Regards
Nigel in NZ
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