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You are here: Home > Articles > Building, Conversion and Maintenance > Paul King's Kyosho Big Bore Shock Build
Building Kyosho Inferno Big Bore Shocks

The famous Paul King (Kyosho America Driver Cody Kings Dad and Pit Pop) gives us the optimal method of building and assembling the Kyosho Inferno MP9 (or MP777) Big Bore Shocks.

Paul King is know far and wide as an authority for wrenching on Kyosho Infernos, so this is a great opportunity for all of us.

PKís Big Bore Shock Build

Make sure you have a shock stand handy. Make sure the diaphragms in
the shock caps have some oil on both sides (just a very thin coat).
One at a time, fill the shock bodies with oil almost to the top, then
pump the shaft half way a couple times, and look to notice the
bubbles. Make sure the shaft is all the way out, and set the shocks on
your stand. Let them sit and allow the bubbles to rise for a few

One at a time, pick up a shock, and fill nearly to the top with oil.
You may have a meniscus about the size of the diaphragm, that is
perfect. No need to over fill. Screw the cap on.

Once you feel the cap is screwed all the way down, hold the shock at a
45 degree angle, with the bleed hole up. Wait a moment to allow any
potential air bubbles to rise to the bleed hole, and unscrew the shock
body several turns. Sometimes I unscrew the shock body almost all the
way, it depends how freely the bleed hole is working. Make sure the
bleed hole is still up. Push the shock shaft all the way in, and look
at the bleed hole to see oil and bubbles coming out. Allow the oil and
bubbles to escape, take your time. You can slowly start screwing the
shock body into the cap after the bubbles stop, but make sure the oil
is still coming out.  Once you think the oil is done escaping, tighten
the cap. You can tighten the cap as hard as you can. Lightly grab the
bushing flange of the shock with pliers, but only hold the shock body
with your hand, and tighten the cap. Wipe the oil off the shock.

At this stage, you should be able to push the shaft all the way in,
and no more oil should come out of the bleed hole. If it does, thereís
something very wrong, and you need to do it over. The shock shaft
should rebound about half way. Itís really not important, as long as
itís not rebounding real fast all the way out. If you ran full
rebound, you probably wouldnít be able to tell a huge difference, but
we prefer to bleed the shocks allot. The big bore shock diaphragms are
tough, so they can take it.

At this point push each left and right shock shaft in and see that the
rebound is equal. You want each side to be the same.

Thatís it.


Thank you PK!!!!
Trevor Morrow

Paul King's Kyosho Inferno Big Bore Shock Build Instructions