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I bought I 03 Polaris trail boss 330 that sat for a few years I replaced fuel pump, fuel lines, spark plug, battery, new carb boot and airbox boot. It starts fine and idles good but when you give it gas it just dosent want to rev past idle.
 

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Correction, when you open the throttle to give it air, the carb fails to mix the proper amount of fuel with the air and the engine slows due to more air and the same amount of fuel. Have the carb professionally serviced, drain the old fuel and put in fresh non-ethanol fuel.
 

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remove the filter and the air box to eliminate any restrictions on the air side, to latebirds point then confirm you have a steady increase in fuel with healthy vacuum.
 

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i fixed the problem it ended up being a broken cdi.
Broken CDI? I would like to see a broken CDI - I've seen them let the magic smoke out, melt the epoxy filler, blow up and melt wires, but I've never seen a broken one.

At least you found the problem. What led you to determine it was the CDI unit?
 
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