i have recently gotten a 2000 yz80 and i went to the local bike shop to get some parts. the kid behind the counter said i would need case oil and to fill it til i saw the oil. i did that and the bike ran good for about 2 hours and then it shut off. well in the past 3 weeks i have been working on the bike and i went to go get the bike shop to pay for the parts. well they were sayin that the case doesnt compress which is wat blew out the gaskets. so does the case compress or doesnt it i need some help.