Okay just got an 03 ltz400 on a trade...bike seemed solid but actually got a chance to ride it today and some things I noticed was when you got on it it kinda cut in and out a lil/ hesitated...not all the time though I’d say maybe 50% of the time also didn’t seem like power was there the whole time...like here in there it would snap a lil and put that grin on my face but wasn’t constant power it felt (now I haven’t been on a quad in years but just seemed like it should have more snap). After riding for maybe half hour I came back and decided to check the oil and it was a gray color. Coolant seemed normal didn’t notice any bubbles or anything or any oil in the coolant...my question is is this a head gasket or maybe a cracked head or I also read some things about a magnesium head where corrosion could allow coolant in the oil? And if this is a possibility how can I tell it the head is magnesium? Thanks in advance! Any help would be greatly appreciated!!