Hello.. I own a 2002 Yamaha Raptor, and I live way out in the country so taking to a dealership is at least an hour out of the way....

My raptor is blowing the coolant into that clear plastic cap where excess water/junk flows into..it is filling it up and overflowing and squirting out the side...meanwhile the engine starts get hot... Have any of you guys encountered anything like before, or know how to fix it... Any help would be greatly appreciated...Thanks!

 

yup, I think it would be one of the two as well.

 

Could be the Water Pump too!

 

could check if it is the head gasket by a compression test.
I do not know the correct specs.
should be above 100psi?

 

Could also be the thermostat, maybe the fan if your riding slow when it happens.
Check for water in your oil.
Compression should be around 180.

 

Radiator Fan. Not sure if Rappys have one but, Thermostat would be an item to check also.