Yacugar Shock Fitment

//Yacugar Shock Fitment

Yacugar Shock Fitment

YACUGAR SHOCK FITMENT TO A 2009 YAMAHA R1

Why do we want to change out the stock shock for a more expensive replacement? Normally we are looking for added hydraulic features to provide greater adjustability and improve ride quality. In most cases, that isn’t the case with sport bikes as they have all the adjustability of an aftermarket shock with one exception – adjustable ride height (the ability to make the shock longer by up to 5mm). The most important reason for this decision that most don’t know or understand concerns the range of adjustment for hydraulics. That doesn’t mean the total range of turns or clicks either. In general stock shocks have a range of 1 to 1.5 turns out of 3-4 total turns where changes can be felt and measured whereas aftermarket shocks such as Yacugar can have a range of 2 to 2.5 turns out of 3-3.5 turns. Without getting too technical, that is achieved through the design of the shape of the adjusters themselves.

TECHNICAL INFORMATION

Stock shock features:

  • -    hydraulic preload adjuster
  • -    high speed compression
  • -    low speed compression
  • -    rebound
  • -    shock length is 295mm

Yacugar shock features:

  • -    hydraulic preload adjuster
  • -    high speed compression
  • -    low speed compression
  • -    rebound
  • -    shock length adjustment +/- 2.5mm
  • -    shock length is 295mm

When removing a rear shock, it is critical that the bike be locked into position. For the purposes of this article, we used a sport chock and rear stand along with foot peg stands. The bike was rolled into the front stand, then supported on the rear stand. The foot peg stands were sized to the correct height and placed under the mounting brackets for the foot peg, as the foot peg itself bends backwards. Once the foot peg stands were secured, the rear stand was removed.

Yacugar

The next task was to remove the Leo Vince Corsa system left hand exhaust can in order to provide access to the upper shock mount bolt.  This also included the connector pipe from the exhaust can to the ‘Y’ pipe requiring securing springs to be removed and the clamp mount for the can to the rear sub frame.

With access to the top shock mount bolt the lock not was removed. The same task was completed with the bottom shock bolt. Both lock nuts were set aside. The lock nut securing the rear shock mount to the frame was then removed. Next task was to remove both the upper and lower shock bolts and then the upper shock mount so that all the shims in place were extracted.  Finally, the stock rear shock was extracted.

Yacugar

Once the stock shock was removed, the upper shock mount was reinstalled with no shims in place and the lock nut was secured but not set to the correct torque value. Next, we brought over the Yacugar shock. It is shipped in a very robust container and the shock is set in a foam mould that keeps it firmly centered in the case. On the inside of the case, Yacugar supplies specifications on the shock.

The shock body is a one piece unit with no hoses attached. The remote preload adjuster can be seen on top of the shock as the smaller cylinder, actuated by hand. The nitrogen reservoir is below it, and to the left of the reservoir are the high and low speed compression adjusters that are color coded:- gold for low speed compression and black for high speed compression. The preselected 11nm spring for my weight comes with 10mm of installed preload and is black  to match the color of the shock body, as is the rebound adjuster which is a dial/round adjuster. Below the rebound adjuster a nut is visible and that is turned to allow the shock to be lengthened or shortened.

The Yacugar shock is installed the same way as the stock shock was removed between the rear sub frame and swing arm. The upper shock bolt is installed first and then the swing arm is lifted to allow the lower shock bolt to be installed by lining up the shock and link plates.

Once the Leo Vince exhaust was secured, the R1 was put back in the sport chock in order to set sag and hydraulic damping. We decided to set sag at a total of 27mm. We also reviewed damping settings in checking range of adjustability with a cold shock and ended up with the following hydraulic settings:

  • High speed compression 15 clicks out from closed
  • Low speed compression 15 clicks out from closed
  • Rebound 20 clicks out from closed

The R1 is now ready to go to the track to test the Yacugar shock and see where we end up on all settings based on geometry and internal valving.

With the shock settings now recorded, the R1 will be fitted with new tires and taken out to the track. During testing, th shock will be reset for all hydraulics to verify the range of adjustability and ride height will also be manipulated to get te best swing arm geometry and edge grip when all the throttle.

More to follow shortly!

The upper and lower shock mount bolts were set to the correct torque value, as was the nut holding the shock mount to the frame.

At this point, it is important to measure the length of the shock in place to make sure the data we have is accurate.  Measuring the stock shock this way we found it to be  295mm. TheYacugar shock measured 295mm so we can conclude the Yacugar shock is the same length as stock as installed (in the middle of its ride height range).

Worthy of note is that the stock shock had a total of 7mm of shims between the shock and the frame. In order to get the same geometry, we have 2 options:

-    put the original shims back and remove 2mm of ride height from the Yacugar shock in order to get a range of +5mms of adjustment longer

-    OR

-    put 5mm of shims back in to allow a range of positive and negative adjustability

For the purpose of the next tire test 5mm of shims were installed to allow adjustability above and below the current setting to compensate for different rear tire circumferences. Next, the Leo Vince exhaust was installed, springs attached and the mount secured for the exhaust can to the sub frame.

By | 2018-01-27T19:14:16+00:00 November 25th, 2017|Categories: How-To|0 Comments

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