When it does start and idle when it is hot does it smell/look like it is fuelling-up?
All quadies have a couple of plugs under the main jets that are prone to dribbling fuel. I'm tipping if not a vac leak as previously mentioned it will be a pretty sure thing that one or both of these bad boys are leaking and piddling fuel straight into the throttle plate. Google is your friend to fix them, there is plenty of good info on the net about how to seal them up and get it running right. They look like a big complicated carby and they can be a little tricky to tune exactly right over about 300hp but they can be conquered.
A carby kit, a can of carby clean, a few basic screwdrivers and tools and a couple of spare hours one afternoon and you can have it running sweet again.
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