What is the maintnace that everyone is doing to these 2 strokes? egine counter balance oil? tranny oil? how often do you greese the zerks? how about the front beraings do you have to take them apart and pack them? anything else i should know its a 1998 400 sport 2/4 i havn't done anything 2 it since i owned it witch was 4 to 5 years now. but it has been down for a year and a half never had a prob with anything besides snapping a chain threw the gear case just fixed that and filled it with agl by polaris. I do everything on these atv's myself and did everything exept the engines now between the 400 and 500 the 500 is a 2001 3 years newer but the one that gives me more trouble.