S3 Two piece head and high compression inserts

For the 09 Raga's and 2010 standard bikes. It also fits earlier PRO's. You KNOW you need more POWER!!

Flywheel Pullers

Jitsie brand, for Montesa, Gas Gas, Beta, and Sherco. From $35.00

HRC 260 Kit for the 4RT

Barrel / piston / gaskets / cam / rings / 2 stage ECU and switch / ecu program
$1895.00

S3 280 Kit for the 4RT

For all you big bore enthusiasts, here is a real 280 kit EXTREMELY well made, this kit includes cylinder, piston kit (vertex) and all necessary gaskets with custom S3 cylinder

$699.00

Scorpa 300cc Kit

Just like the S3 4RT kit above, very well made!
$699.00

S3 Gas Gas 225cc Kit

125/200 Gas Gas Pro machines can be enlarged to an actual 225cc ! The S3 225cc kit includes cylinder, piston kit, cylinder head and gaskets as well as easy to follow instructions. This unique kit uses OEM Gas Gas parts that fit into this custom made S3 cylinder, so parts are not a problem for pricing!

Compression Reducer for Gas Gas 280/300/250

Makes the low end more rideable and controllable, at a slight reduction in overall power.
$38.00 each

Gas Gas 200/125 Pro Flywheel Weight

Increases bottom-end grunt! Call for availability and details.
$65.00

Gas Gas 280/300 Pro Flywheel Weight

Slow that beast down!
Kit with spacer and hardware
$159.95

Flywheel weight for the Gas Gas Pro
Complete with gasket and spacer.

$159.00

Montesa 4RT Jitsie Steel Clutch Plates

The Jitsie steel clutch plates have a special design similar to the look of a golf ball. This improves the oil flow between the clutch plates, hence making the clutch a lot more progressive and easier to control. An absolute must have for the Montesa 4RT owners.
Fits the Montesa from 97-07.   Larger photo

$48.95 per set

Montesa 4RT Clutch by Mitani

Three pairs of disks with different coefficients of friction provide a more progressive clutch! - Also for 315.

$186.45 per complete clutch set

Montesa 4RT   HRC -2 Stage mapable ECU / switch and CDROM
$368.00

Connection leads and CD rom
$212.00

Montesa 4RT Remappable ECU

A remappable ECU single stage.   Changes the fuel and ignition timing maps, with 5 different maps available. Maps can be changed by LewisportUSA or build your own!.

ECU unit  $317.00
Connection leads and CD-ROM  $212.00

Finally, a complete Keihin carburetor set up!

We have put together a complete Keihin carb set up for the Gas Gas, in particular the Pro model. This kit contains everything you need to fit a Keihin using the "Raga" intake manifold / reed block setup. Complete with cable / gaskets / spacer/ bolts / washers / needle / jets / carb / manifold / adapter / clamps. This gives a smoother bottom end and better overall power and response. It is also less susceptible to altitude change due to the larger air intake. 

$389.95 
We can also supply this kit with a set of Boysen dual stage reeds for an extra $35.

Dellorto Flat-Slide
Conversion for Beta Rev 3

Call for details

SCORPA SY125 MODS:

Bigbore 143cc kit
Bigbore 160cc kit
Pilot jet for smoother bottom end
Clutch kit, smooths response $165.00 complete