1998 YZ125 Kick Start Noise (grinding/whirring noise)

Hi everyone, im new to 2 stroke engines, ive just brought a 1998 yz125 that has had a top/bottem end rebuild 2 tanks ago, I have only taken it for a short run since buying it down the road and back......now for my problem......the kick start sometimes gets stuck down and when the engine is running there is a very noticeable grinding whirring noise coming from the kick start, if I pull the kick start shaft outwards the noise gets louder and also it varies with engine revs like its spinning something at the same speed as the engine. Any help would be greatly appreciated as im hanging out to take it for a ride but don't want to damage anything by riding it yet.

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