A DIY kit containing everything you need to perform the shock swap with your own 99-02 R6 or 07-08 R1 core. This will include a correctly sized spring rated for your weight, a threaded preload adjuster, a spring shim, 12mm to 10mm bushings for the bottom eye of the shock, and two stainless steel bushings for the sides of the bottom of the shock to take up the difference in size of the bottom of the R6 shock vs the width of the OEM shock. You will need to supply your own shock core, and be capable of disassembly of the shock / removing the old spring, and fitting the new parts to your shock core.

This is a direct bolt up modification for model years 14-16. In 17, KTM changed the exhaust, and the exhaust interferes with the nitrogen reservoir on the R6 and R1 shocks. You can still fit the Yamaha shock to your 390 with newer model years, but you have to change the exhaust. If you fit the Tyga Header (part EXPT-0003) you can then run any 14-16 RC390 exhaust system, or run either of the two Tyga dual undertail exhaust systems.

Note: KTM changed the exhaust after the initial release of the bike. If your bike has a stock right side exit exhaust, you will need to fit a decat / midpipe to allow room for the nitrogen reserve on the shock. Otherwise that should be all you need to modify to fit the Yamaha shock to your 390.
Estimated Product Weight: 7.90lbs / 3.591kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

This is JUST two thin stainless steel bushings for the side of the bottom of the shock. The R6 shock width is ~1.5mm narrower than the OEM shock, which then requires two bushings on the side to them take up this missing width. The bushings have been turned on a lathe here at Formula390 from billet stainless steel bar stock, with a 10mm clearance hole on the ID, and a width for the two washers to take up this missing space so your R6 shock once fitted is not then loose on the bottom bolt which mates the shock to the swingarm.

NOTE: The R1 shock needs different side play bushings which need to be 0.103" wide. I can make this special order, but it might be easier, and cheaper, to make them yourself with a stack of washers. Feel free to contact me however if you need help with this.
Estimated Product Weight: 0.02lbs / 0.009kg
Estimated Product Box Weight: 0.10lbs / 0.045kg

These are the 12mm to 10mm reduction bushing necessary to fit bottom shock mount for the R6 shock to the RC390 Frame. The bushing are PTFE-lined bronze bearings with steel shell and have a slit running along the length of the bearing that allows you to slip fit them into the bottom mount of the R6 shock. A width of 30mm is necessary, so comes with two 15mm wide bushings for total 30mm.

Note: The 07-08 R1 shock bottom mount is already 10mm, so you don't require reduction bushings to fit the R1 shock on the RC. You DO however need to grind off the small risers on the side of the swingarm mount location to clear the shocks lower adjuster. This isn't necessary for the 99-02 R6 shock. It's a minor cosmetic change to allow fitment.
Estimated Product Weight: 0.02lbs / 0.009kg
Estimated Product Box Weight: 0.10lbs / 0.045kg

This is for labor involved in installing the DIY kit onto your shock core. To coordinate, you can email with Matt@Formula390.com to arrange shipping your core here.
Estimated Product Weight: 0.01lbs / 0.005kg
Estimated Product Box Weight: 0.01lbs / 0.005kg

For 2015-2021 - Front Springs for your bike are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

So far, KTM has not changed the front forks so these springs will work for ALL model years (2014+) for the RC390.

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

For 2015-2021 - Front Springs for your bike are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

So far, KTM has not changed the front forks so these springs will work for ALL model years (2014+) for the RC390.

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

For 2015-2021 - Front Springs for your bike are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

So far, KTM has not changed the front forks so these springs will work for ALL model years (2014+) for the RC390.

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

For 2015-2021 - Front Springs for your bike are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

So far, KTM has not changed the front forks so these springs will work for ALL model years (2014+) for the RC390.

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

A Pin Wrench is necessary to disassemble the forks. This specialty tool is available here as a convenience for riders who don't already have one.
Estimated Product Weight: 0.50lbs / 0.227kg
Estimated Product Box Weight: 0.40lbs / 0.182kg

For 2015-2021 - These Ride Height Adjusters replace the blank end caps on the stock KTM RC390 front suspension. These caps allow the rider to increase and decrease the ride height of the front forks allowing for quick changes to steering geometry without having to go to the trouble of moving the forks up and down in the clamps.

Supplied in black and clear anodised finish, these adjusters are as beautiful as they are functional.
Estimated Product Weight: 0.44lbs / 0.200kg
Estimated Product Box Weight: 0.44lbs / 0.200kg

For 2015-2021 - Racers and serious Street Riders asked, and we've answered! We are now able to offer a Steering Damper Kit for your RC390 to fit your budget and requirements.

The Damper Kit works with the Tyga Triple Top. The supported part numbers are: TYLY-1073, TYLY-1073(p), and TYLY-0132. It does NOT work with the stock triple top, other aftermarket triples, or the Tyga TYLY-1273 trip. The damper kit is CNC manufactured to key into the triple perfectly! This is now our prefered method of the kit, and works as if it were designed for the damper from the start!

The damper iteself is a rotary damper, with 25 clicks of adjustment which is available to adjust while riding even. The high speed circuit will absorb the high energy hits and dampen out tank slappers and sudden jolts to the steering. There are 3 fully adjustable circuits in all. The damper mounts to the top of the Tyga triple clamp. The torque arm connects to a frame mount which safely and firmly clamps onto the frame and holds the pin firmly with no flex in the pin even with the damper set to it's highest setting. We've TRIED to get our mount to flex. It's a VERY rigid setup we know folks are going to love! The damper hardware kit frame mounts between the fuel tank and the headstock. There is a small nub on the front of the top rail clamp, which can be filed down to get the pin in the right location based on the welds of your frame. Some very blobby / ugly welds can otherwise prevent the damper from being able to move forward on the frame, so that's why this nub is there if needed to help set the pin location in relation to the damper arm. The Damper Kits also meet the need for racers who's clubs require dampers to be mounted, or those who just wish to settle down that front end for those who ride hard and desire a little extra stability... or an edge over the competition.

Estimated Product Weight: 1.00lbs / 0.455kg
Estimated Product Box Weight: 0.50lbs / 0.227kg

For 2015-2021 - This comprehensive kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Finally, we provide a complete set of high quality Japanese Koyo wheel bearings to replace the not so good ones supplied from the factory.

All in all, a useful and inexpensive upgrade. Now you really are ready to race!

Included in this kit are the following components:

• Bearings:
  • Front Wheel x 2
  • Rear Wheel x 2
  • Sprocket Carrier x 2
• Seals:
• Front Wheel x 2
• Rear Wheel x 2
• Spacers:
• Front Wheel: Left, Right, and Center
• Rear Wheel: Left, Right, Center, and Sprocket Carrier

Estimated Product Weight: 1.37lbs / 0.623kg
Estimated Product Box Weight: 0.66lbs / 0.300kg

For 2015-2021 - This comprehensive kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Finally, we provide a complete set of high quality Japanese Koyo wheel bearings to replace the not so good ones supplied from the factory.

All in all, a useful and inexpensive upgrade. Now you really are ready to race!

Included in this kit are the following components:

• Bearings:
  • Front Wheel x 2
  • Rear Wheel x 2
  • Sprocket Carrier x 2
• Seals:
• Front Wheel x 2
• Rear Wheel x 2
• Spacers:
• Front Wheel: Left, Right, and Center
• Rear Wheel: Left, Right, Center, and Sprocket Carrier

Estimated Product Weight: 1.37lbs / 0.623kg
Estimated Product Box Weight: 0.66lbs / 0.300kg

For 2015-2021 - This kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Now you really are ready to race!

Included in this kit are the following components:

• Spacers:
  • Front Wheel: Left, Right, and Center
  • Rear Wheel: Left, Right, Center, and Sprocket Carrier

Note: We also offer a similar product in orange and kits for the wheel spacers, bearing and seals
Estimated Product Weight: 0.51lbs / 0.232kg
Estimated Product Box Weight: 0.04lbs / 0.018kg

For 2015-2021 - This kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Now you really are ready to race!

Included in this kit are the following components:

• Spacers:
  • Front Wheel: Left, Right, and Center
  • Rear Wheel: Left, Right, Center, and Sprocket Carrier

  Note: We also offer a similar product in orange and kits for the wheel spacers, bearing and seals
  Estimated Product Weight: 0.51lbs / 0.232kg
  Estimated Product Box Weight: 0.04lbs / 0.018kg