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It490 carb issues? Help!

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I have a 1983 it490. Problem I'm having is it doesn't idle down after being ridden for a hour. It what's to rev up when I come to a stop when it's hot. I thought it could be the mix I was using so I start to toy with that but had limited success. Any ideas????

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Most likely a small air leak somewhere.  When the bike wants to idle up, or has a hanging idle, that is usually the culprit.  Check your left side crank seal, the cage boot, and the boost bottle and rubber hose that connects it to the reed cage boot for any cracks or loose/missing clamps.

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