Yes, this is normal...even a lot of cars do this. My XLT always does this, it will idle right around 4000 rpm for about 3-5 mins until the engine warms up then it drops down loaw around 2000 rpm. My XC 700 doesnt do it as much but it still does a little.
well what i'd suggest before taking anything apart ,, tried turning your idle adjustement on the side of your carbs ,,,,,,i know my buddy's 91 indy trail was doing the same thing ,, was reving high about 3300RPM , and just a couple days ago i played around with that adjustement until both pistons sounded pretty much the same ,, and now mahcine rev's at 1800 and hasn't had the problem since
The engine is to lean when it idles high. If you adjust the idle screws on the sides of the carbs when the engine is warmed up it should take care of the problem. Remember it's the idle mixture screws not the idle speed.
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