The Power Up Kit: (Honda Parts available from your local Honda dealer)
Most owners want a little more spunk from the bike. An inexpensive and effective way to add power is do these modifications. This involves getting more airflow on the intake, re-jetting the carb and opening up the exhaust. These changes should be done together as a lean condition will occur and possible engine damage as a result.
Honda recommends this as a starting point:
16012-KPS-921 Needle (Includes Power up needle, Clip, and needle jet)
99113-GHB-1320 Main jet (Where 132 is the jet size)
99103-MT2-0450 Pilot jet (Where 45 is the pilot jet size)
The needle clip in the 4th position counting down the rings from the blunt end of the needle. The fuel screw at 1.5 to 1.75 turns out. At the same time install a high flow Air filter like
http://crfsonly.com/catalog/product_inf ... cts_id/142 and remove the snorkel and snorkel gasket from under the seat. Next step is to remove the baffle from the end of the exhaust. This is the black insert held in by a torx screw on the side of the end cap. Another option if you can afford it a high flow exhaust that will help power as well.
http://crfsonly.com/catalog/product_inf ... cts_id/529
This is a safe starting point as the bike should run a little rich(more fuel) and keep the motor cool. Again this is a starting point and you may need to adjust/change to meet your needs.
Fuel Screw:
A handy item to install at anytime is this fuel Screw. This allows tool less fine adjustments to your jetting anytime anywhere. These adjustments are necessary with seasonal temperature changes.
http://crfsonly.com/catalog/product_inf ... ts_id/1362