weird noise on bike

i just bought a 2008 rmz 250 with alot of after market parts i am having problems starting it cold and when it runs it makes a weird slushing noise

does anybody no what this noise is

Well, start by draining the oil and see what it looks like, what does the filter look like? if that looks ok then check the coolant, what color is it etc.? pull the spark plug what does it look like? I've always been leery of modded bikes, you never know if the mods were done right, if you're really unsure then take it to a reputable shop and have them check it over

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