*****     OEM parts diagrams and part numbers can still be found at this site.      *****
We can get whatever you need !

Here's a PDF version of the 2005 4RT parts book (2 Mb).

Note that there are Montesa parts in other sections of the catalog,
such as guards, gas tanks, bar clamps and levers, fork braces and such...

 

Here a couple tech tips on the Cota 315.

There are lots more Montesa items on our other pages!
Guards of every sort, fenders, stickers, bar and clamp items, footpegs and brackets, and more!

Mitani 4RT Fender Helpers

Stops cracked fenders. Supports the fender directly behind the air box for more rigidity.-Stop craked fenders!-"now--twice as thick! "
$117.95
Larger photo
Complete 260 Kit
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

$1200.00

4RT Seat Units
The long awaited seat units for 4rt or ?---- we have many customers fitted these to all brands of trials bikes with some retro fitting--
$179.00

**NEW** fitting kits for the Montesa315 now availible--$46.50

Photo 1   Photo 2

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

Connection leads and CD rom--$212.00

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 umit $317.00---Connection leads and CD-ROM--$212.00

Jitsie Steel Clutch Plates ---$48.95. per set
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

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

TRP Spring for shock on 97-07 Montesa
Avaailible in 3 spring rates -
10% softer for riders - 80kg
standard replacement
10% harder for riders +80kg
Price --$139.00

TRP Complete Shock on 97-07 Montesa
These complete shocks will make a tremendous difference! See the Suspension Page for details.
4RT / 315 Montesa spoke adjusters by Mitani
In anodized colors, for that final piece of "bling"!!

Montesa 4RT front sprockets

9 tooth tooth front sprockets
$29.95 each.

4RT "Flat Tank" in Repsol Orange

Top view

Mitani 4RT Flat Tank

Cover available in dark or silver carbon.  Requires your old tank as donor.

Larger photo   Detail
4RT Race 1.6 litre SP tank
Just like the works HRC bikes
From MITANI Japan
Another photo -- call for details.

Sound Reducer

For the 4RT, by Jitsie. For those that want a quieter 4RT.--and yes! they actually work!!

fitment for 05/06---07and on. --$94.00

Titanium Silencer for the 4RT---$516.00.00

By Mitani, Bolt-on, lighter and quieter than stock.
Carbon fiber sleeve for protectionavilible in dark carbon or silver $84.00

Photo 1, onbike
Photo 2, onbike
Photo 3, offbike

Titanium 4RT Muffler and Header Pipe

Imported from Japan, half the weight of stock.  Call for more details and pricing.

  Muffler photo

Header Pipe for the 4RT!

Titanium, made by Mitani
2mm Larger diameter, loads of power!
Bolt-on, use the stock heat shield or the Mitani carbon fiber shield shown below --$228.00
On the bike
Comparison w/stock

Jitsie 4RT Oil Filler Plug        

CNC machined, sturdier than the stock plastic plug.
Available in red only, supplied with the rubber o-ring.
Hi-Flo 4RT Oil Filter
Do it right! Change the filter at every oil change.--$8.95
Air Box Top Cover-----Dark Carbon $84.10
4RT, by Mitani

V-Mar Montesa Rear Brake Pedal

Fits 4RT and Cota 315
It is smaller and tucks behind the clutch casing and therefore eliminates nearly all chances of bending and breakage!   $119.95 without hardware.

Jitsie Brake Pedal

For the 4RT and Cota 315
OE style, very similar to stock, but less expensive!

Brake Pedal

Steel
4RT or Cota 315
$120.00

Aluminum rear brake pedal

Fits the 4RT or Cota 315!
Less expensive and more sturdy than stock.
Made from aircraft grade billet aluminum
Uses your old seals and bearing.--$119.00 without hardware--
Hardware kit--New seals/bearing kit--$45.00

Rear Brake Pivot Nut

4RT or Cota 315
Steel rather than aluminum, MUCH stronger than stock.
$28.00

Skid Plate----$215.00

For 4RT, made by Mitani
Extra-beefy, 5mm thick (vs. 4mm stock)
5cm. longer at the rear to protect the linkage.

Heavy Duty Skid Plate

For Cota 315
Built-in header pipe guard
$135.00 --now longer to protect dog bone linkage!

4RT bashplate

Heavier than stock, made specially for LewisportUSA
Now longer to protect dog bone linkage!

$179.95 in silver
$212.00 anodized black

Mitani Sidestand

4RT and Cota315
Aluminum alloy
Set back, lighter, and longer than stock, tucks up better.
HUGE improvement over stock! $168.46

Lewisport Lift Kit

Very economical!
$29.95

 

V-Mar Suspension Upgrade

These replacement rear shock linkages are designed to give the rear end of the Montesa a slight lift, and slightly stiffer feel. It eliminates the rear end sag and gives the bike a more lively rear suspension. This gives you improved 'hop' without sacrificing the excellent rear end traction. CNC machined from 6061 T6 aluminum and black anodized. Installed on a Repsol Replica 4RT

Fits all Montesas from 1997-2005 including the new 4RT.
$49.95

 

Linkage Bushings

By Mitani
4RT or Cota 315

 

 

Linkage Bolts w/ Nuts

Titanium, made by Mitani
4RT or Cota 315

 

V-mar Brake Hose Clamp

4RT or Cota 315

This trick little piece mounts to the front fork and clamps the front brake line in place. It can be placed on top of the fender mounting plate on most bikes, or it can be placed under the fender mounting plate to raise up the front fender (see the description for the fender spacers, below). Sold individually or as a set with three fender spacers and four new bolts.

Clamp only $24.95
Clamp with 3 spacers $34.95

V-mar Fender Spacers

4RT or Cota 315

In muddy or gravel conditions the front fender on the Montesa sits a bit too close to the tire.This set of spacers raises the front fender about 10mm. The kit comes with 4 spacers and 4 new longer bolts.

These will fit most bikes, but the Montesa is the bike that really needs the fender raised up.

Spacers and bolts $14.95

Countershaft Sprocket Guard

For Cota 315
$17.50

Spacer for Front Wheel

4RT or Cota 315
Replaces speedo drive, machined so it covers & protects the wheel bearing.
$17.95

Mitani Bolt Kit

For the 4RT
Aluminum, Gold or blue