Hi, I’ve got a 2001 Honda 400ex that’s been bored to a 440cc with Stage 3 Hot Cams along with it being ported and polished, etc. Now, I’ve removed the air box lid and installed a Uni Foam Filter and deleted the snorkel tuba on the air box. It’s already got a full Yoshimura off-road exhaust and...

first ever post here. frequent rider but never worked on a ATV. my father currently owns the mentioned atv in the title and i was curious as to what all would need to be replaced and done as part of a tune up maintenance interval/ fluids, plugs, parts, oils, belts. ect i plan to do the work and...

It's almost time for my 400ex to have its first maintenance thing. Its going to be about 125$ for the honda service to do it. Can I do all this stuff myself or do I have to take it in? Like if I dont take it in will that void my warranty? My family is pretty mechanical with 4-wheelers, boats...