Pilot Modification Recommendations by hoser..

                                                 
                                                 
     1.Modify your air box so the engine can breath better, just about any modification you do will require
     the more air to the engine. You don't need to add the pre filter unless you ride in extreme dusty conditions
     and are tired of washing filters.
      
     2. Change the stock clutch to something you can adjust, just by allowing the motor to rev 500 RPM more
     on take off will make a night and day difference in the way your Pilot performs. On a stock machine I would
     set the clutch to engage at 3800-4200 RPM.  ATV Racing can set you up with a Power Bloc for about 
     $250.00. Don't be scared to ask this guy questions about clutching.
      
     3. Next would be a after market pipe and silencer to make the motor breath even better, I recommend you
     get a torque pipe unless your going to be taking your motor past 7400 RPM both ATV Racing and Power Pros
     offer both rev and torque pipes. 

     4. A larger carburetor, something around 36mm for torque and 39mm for a high revving motor, you can 
     get both from www.pro-flo.com will set you up with what you need.
      
     5. Porting, if your still not satisfied with the amount of power you motor is putting out. ATV Racing and 
     MacDizzy offer porting that will wake up your machine, MacDizzy did mine and I have no complaints, he 
     is also about 200.00 cheaper than ATV Racing, If you decide to get porting done you will need to ship 
     your intake manifold (black rubber part the carb connects to) reed cage, cylinder, head and exhaust
     manifold because all will be modified.  Here you can see some of my porting  Pilot Porting 2003
     

 OR the Hoser Enhancements

      
     6. It wont be long after you start making all this new power that you will find out you need more 
     traction, I decided on the stock Honda tires because they work well under all conditions, you 
     can get a set and any other Honda parts from Hillside Honda 707-263-9000 (ask for Joe), they give our
     Pilot-Odyssey group a great discount just tell them your with the Pilot-Odyssey group and want the "Good
     Guy" discount.

Pilot Modification Recommendations By Kiowa

What you will find is that no part stands alone when it comes to your engine.
On a stock engine a larger carb will decrease low end velocity, which will hurt your 'throttle response' 
on the low end. But a larger carb might help the top end on a ported engine with a rev pipe.

When I first got into my Pilot, I was like you...how do I make it go faster? I bought a 39mm carb 
(partially because I damaged my stock carb), and because of the type of riding I do (mostly trails, 
some dunes) it made it very hard to jet properly to get the type ofresponse I wanted out of it...the 
bottom is still kind of sluggish, but I think it is as close as I am going to get it without porting.

You basically need to make a choice of what you need out of your engine...torque or revs.

Torque will be best suited by a smaller diameter carb, porting for toruqe and a torque pipe...revs 
will be best suited by a larger carb, porting for revs, and a rev pipe.

In either case, making sure the engine can breathe is important...get more into the air box should 
be the first things you do. The second thing you should do is get an adjustable clutch, so you can 
map the clutches engagement to the bringing of your power band, rather the the stock clucth that 
engages way to low (below the power band).

Once those two things are in place, and you engine is properly jetted across the entire RPM range, 
then I would add the followingin the following order...reeds, pipe, porting/head work, carb, carb 
modifications (boring, turbulence restrictors, volume reducers, etc)

You are going to have to make your decision of what type of engine when you pick your pipe...that 
is where you are forced to go one way or the other...after that, port to match the pipe and get a carb 
that is taken advantage of by the porting. Then tune the carb to clean up the opposite end of the 
powerband from what you selected (boring for Revs on a torqy engine, volume reducers (vanes) 
for torque on an Rev engine)...