I have a 2003 Z400. This is my first four stroke and I am not to familiar with what can be done to this bike. I tried to remove the air box lid to see if it would breath better, this is what Ive done to my 2 strokes in the past. The bike sounded alot better right off the bat, but when I tried to rev it up it kinda crapped out so I put the air box back on. Does anyone know What I can do without spending any money that would give me some extra power. I think it is probably a jetting issue, but Im not sure and dont want to hurt my bike.

 

you can take off your airbox, but your going to have to rejet. jets are only like $5. you can take off the choke. you can change around your sprockets pretty cheap, too.


oh, and where do you ride?

 

I ride mostly at the Oregon dunes. Sandlake, Winchester, etc.. Some dirt/trail but not much. I just like to get the most out of what I have. I'll try the jetting and see what that does, Thanks.

 

boxerman nice pics i like the lt80 sweet....

 

With the lid off, you are running lean, which can damage your engine. Rejet before you ride again!

 

ya, going to have to jet up without the lid...jets here run 3 bucks...and that and a gearing change would be your cheapest upgrades, then upgrade your airfilter.

 

Thanks guys. How high of a jet do you suggest? I will probably run with the stock pipe for a while and I live at about 400 hundred feet above see level.

 

Here is a great website that shows some of the easy mods for cheap:

Power for Pennies

 

ltz400 guy. Thanks, this is what I was looking for.

 

And in the wet season, like now, remove that spark arrestor too. You'll notice 5-10% more power. Plus it sounds a bit meaner.
Just don't do it when you're riding in a dry hay field or something.