Motorcycle Suspension Components
with other products available from Kientech Engineering
2005-07 KX250 2 stroke (PN. KX250-1 & KX250-2)
KX250-1 lowers the rear 3/4" & KX250-2 lowers the rear 1 5/8".
KX250-2 Koubalink shown above.
1) Raise the motorcycle
with a bike stand, milk crate, etc., so the rear wheel is slightly off
the ground. Remove the two 14 mm nuts off the mounting bolts that
hold the “H” link to the rocker and the engine cradle, push the front bolt
out the right side & the rear bolt out the left side/front mounting
bolt first. The swingarm may need to be raised slightly to allow the bolts
to slide out freely.
2) The new link comes
with only the bearings and seals, so install the center sleeve & the
two step washers on the ends (flat side out) from your old OEM link into
the bearing end of the new Koubalink. Install the KoubaLink (grease
fitting pointing down) on the bike (front mounting bolt first) by pushing
the mounting bolts in from the right side. Make sure all the vent hoses
are inside the front mounting brackets and in front of the link before
you line up the mounting holes of the bracket and link. Push the rear mounting
bolt in from the left side. **You will have to raise the swing arm
to align the rear mounting hole with the link eyes.
3) After installing the
KoubaLink and before installing the mounting bolt nuts, check that the
grease fitting is facing down. *Left link engraving will be upside down
and back wards, right side will be readable left to right. Install
the 14 mm nuts & torque to 35-40 lbs-ft.
4) For the best performance,
set the race sag (amount of vertical movement of the rear axle FROM no
weight to bike weight plus rider weight) at 3.25” to 3.50” with rider in
full riding gear, standing on the pegs. Slide the fork tubes up approx
1/8-3/8" (depending on how quick you want it to turn) with the KX250-1
link and until they barely clear the bottom of the stock bars with the
KX250-2 link. *Do not over torque the triple clamp bolts. (14 ft.
lbs. lower, 17 ft. lbs. upper) If the links are for lowering purposes ONLY,
race sag can be set at 100mm/3.90", and the KX250-1 link will lower the
rear 3/4" and the KX250-2 link will lower the rear 1 5/8". The easiest
way we have found to adjust the rear spring preload is to use a long punch
to loosen the top jam nut from the right side, then grasp the spring at
the bottom and turn the spring and the nut at the same time. **You may
have to put some lube on the shock threads to allow the nut to turn freely.
Turning the spring/nut "clockwise" increases the preload and decreases
the sag. **Do not forget to tighten the jam nut with the punch after setting
5) For additional lowering
of the front, the handlebars can be spaced up by installing a washer of
1/4" max thickness on top of the flanged washer above the top rubber handlebar
mounts. This will allow the forks to be slid up farther but is not
recommended unless you require quicker steering. Remember, lessening the
rear race sag or sliding the fork tubes up will make the steering quicker
and the opposite will slow the steering. Disclaimer: Do not
slide the forks up more than the stock handlebars with the 1/4" spacers
will allow as that may allow the tire to hit the fender. :-(
Lowering the rear more than the front can change the geometry and could
effect the handling.
If you like what the KoubaLink
does for your suspension, please tell everyone, if you do not, please tell
us. We can be contacted at our email address below and are always
interested in your questions or comments.
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