I baught a 03 400ex a few months ago and its starting to smoke at high rpms and rattles at the top of motor i think its time to tear down and rebuild the top end. Does anyone have any suggestions on what brand kits or types of kits i should use or if i should go with more power and get a bore kit? Also would like to know brands and type of kit for the bores as well. Any tips would be much appreciated this is my first ever rebuild and resources are limited so keep that in mind i would like to do this myself in the upcoming fall or late winter so im in no rush just looking for research and answers for fastest potential out of bore kits if i go that route
Thanks.