$249.00
(Includes pivot bushings & balljoints) |
Although we think that the Upper Only Kit is the best
"budget" suspension/handling upgrade you can make to your
stock quad, all of our YFZ and TRX450 kits come with the new
"Quick Change Shims" to make your adjustments QUICK, EASY
and DEAD ON ACCURATE... every time. When ordering your
complete A-arm kit, be sure to ask about the "Quick
Adjustments".
After extensive R&D, we have discovered
the Quickest Easiest most Reliable way to correct the twitchy
steering in the YFZ450 and offer quick adjustment in the
TRX450R.
The tendency for the stock
front end to be unstable at high speeds or make sudden left and
right movements when you hit a rock, tree root or bump in the
trail is do to the AGRESSIVE caster settings from the factory.
JD Performance discovered the problem, and FIXED IT!
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The JD Performance
Upper Only A-Arm Kit uses a simple system of shims that can me
adjusted in 3 different settings to suit your particular need.
By simply removing the pivot bolt and changing the location of
the shims, you can make your bike go from a nimble MX champ to a
straight shooting Desert rocket.

Caster refers to the angle of the front spindles. The "more
caster" your bike has, the more the spindle is leaned either
forward or back. This will make the bike turn "faster" or
"slower". If you notice that the steering is rather twitchy or
it takes only slight movement in the bars to make the bike turn,
then you have "fast" steering (stock YFZ). If your bars have a
lot of play in them before the bike turns, then you have "slow"
steering. The YFZ is fast in the stock setting, while the TRX is
rather neutral (the real MX racers will want to speed this up).
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NOTHING... Let's say it again. When you order the Upper only
kit, you don't need to order, buy or modify any other parts for
your quad. It's quick, easy and accurate.
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Many other companies are using heim joints on their A-arms.
Although they are strong and a great way to design a system for
a PRO mechanic, the every day rider/racer can't accurately
adjust them. In order to adjust the Caster on a set of A-arms
that uses heim joints means you much completely remove the arm,
and turn the heim, then re-assemble. Turning the heim not only
adjusts the caster, but it also changes the caster. What does
this mean? It means you must adjust both heims (accurately) in
order to achieve the desired affect. If you have tried it, then
you know what we mean.
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