[AllHonda]

The 400's were a pain in the ass to change the plug. They fixed the problem when they made the 450 building a deeper frame lowering the engine. The spark plug wrench the bike came with works.

 

[AllHonda]

Did you look in the trunk? Its in there in a plastic tube with the rest of the tools. If not, the spark plug tool from other Honda's will work.

 

[AllHonda]

If you going to drain it, you may aswell remove the carb and remove the bottom and do a job of it. I use compressed air to the jets and clean as much as i can.