For bikes with a STOCK airbox

Boosts power a bit at full throttle, improves throttle response and wheelie ability. Definitely pulls harder out of 2nd and 3rd gear corners.
Finely honed to perfection - the High Speed Low Inertia EC997 Eddy Current dynamometer allows us to discern even the difference between individual cylinders. This BIKE is impossible to tune on a dynojet or other dyno, using sweep tests or by tuning to "A/F Ratios".
This kit is finely designed - using different needles on the inside cylinders and the outside cylinders. Good for additional midrange over any kit that uses the same needle in all cylinders.

Note:
Some non-USA bikes have a "screw-in" type main air jet (according to installer in UK as of 02/2009).
Please inform us as to whether you have a "screw-in" or "pressed-in" Main AIR Jet when ordering.

email us direct
 

For bikes with a MODIFIED airbox

Same as R&D detail as above 1.7-RK kit, but for use when you've got to work with an airbox that's had the airbox already modified.
 

Note:
Some non-USA bikes have a "screw-in" type main air jet (according to installer in UK as of 02/2009).
Please inform us as to whether you have a "screw-in" or "pressed-in" Main AIR Jet when ordering.

email us direct

for orig equipment  Keihin FCR mx carbs.

$79.95 each
(Needs 4 tubes)

for orig equipment mx type Keihin FCR carbs.

replaces original  FCR emulsion tube. Makes more power and improves throttle response.

On a test yz250f, we gained 5% to 7% hp at peak.

The FCR secret.

 $79.95

RH Cover
For race or street use. Absolutely the strongest cover you can buy. Highest strength / weight ratio available!
More clearance and cover thickness than stock on RH side covers.
Can be show polished to a mirror finish!
Includes: gaskets, if required and replacement stainless steel allen screws.

Ignition Advance Rotor

 Adds some power at ALL part throttle positions. That equates to more "snap" in throttle response for you.

+2 adds some low and mid and more topend.

SPECIAL order +6 ($99.95) adds more lowend and midrange and not much more topend.

Helps prevent shift fork and shift dog damage caused by missed shifts.

A MUST have item for competition use.