How many errors have you found in the manual?

According to my manual, my machine is a 4x4. sweet!

Is 87 really the correct octane (for those of us near sea level)

Yeah, I noticed that, too. I didn't find anything else, though. I've always used 87 in all my atv's. I've never had a problem with it.

They don't specify what coolant to use.

so I should use 87 in my Z400?

*hmm*

I buy premium for my Z. It doesn't cost that much to fill it up so why skimp on the gas. Its only a 2.6 gallon tank!

it's not skimping if the engine doesn't require it.

With car engines, running too high of an octane can cause problems in the long run

Some people have experienced pinging with their Z's in hot weather. Premium will not hurt the Z in anyway, infact it might give it more power, not noticable, but more power. So why not? Your guaranteed not to get pinging and it just might give you some extra power.