YOUR IV CORE KIT INCLUDES:
1 x Propshaft Assembly
1 x ST All-Metal Bolt
1 x ST3 Soft Tip Bolt
1 x Spares Bag
IV CORE
UPGRADE KIT
The GEO IV Core
is designed to fit and work in GEO, GEO+,
SL91, GEO2, GEO2.1, GEO3 and GEO3.1 markers.
Please fully read these instructions before attempting to install this
IV Core
kit into your marker.
FITTING THE IV CORE
1
Remove the original Propshaft Assembly, Bolt and Can.
2
Separate the Can and Bolt assembly.
3
Place the original Bolt and Propshaft assembly to one side.
This will no longer be required.
4
Take your Can and clean it thoroughly. Pay particular attention
to the internal 017NBR70 o-ring. In the IV Core kit you will find
a spares bag. Remove and replace the external 020NBR70 and
internal 017NBR70 o-ring if required.
5
Grease the Can as per the instructions in your GEO manual.
We only recommend the use of Planet Eclipse grease in the
GEO internal assembly.
6
Grease whichever new IV Core Bolt you are choosing to install at
this time as per the instructions in your GEO manual. Ensure you
grease both the inside and outside of the bolt. Insert the IV Core
Bolt into your existing Can.
7
Grease the front 14x2NBR70 Propshaft o-ring of your new IV Core
Propshaft Assembly as per the instructions in your GEO manual.
Insert the IV Core Propshaft Assembly into back of the IV Core bolt.
8
Insert the whole assembly into the back of your GEO. Screw in
finger-tight. Your new IV Core kit is installed and ready to use.
PROPSHAFT CUT OFF ADJUSTMENT
The GEO IV Core Kit has a feature that allows adjustment of the shut-off point of the Propshaft. This
shut-off dictates how much tail-end air is trapped in the firing chamber after each shot. The more air
that is trapped, the more efficient the marker becomes. The less air trapped, the less efficient the marker
becomes. However, if too much air is trapped in the firing chamber after each shot, peak velocity will not
be achieved.
The adjuster screw can be found in the rear of the back cap. It uses at 1/8” Hex Key for adjustment.
For reference the adjuster has a range of 8 full turns. Always use the adjusters FULLY REARWARD
position as a starting point. Screw the adjuster counter-clockwise until the screw is flush with the rear of
the back cap. DO NOT over-tighten. At this point the Cut Off is set at the minimum level. This is trapping
the least amount of air after each shot. NOTE: Even in this position the IV Core is still trapping over 25psi
per shot inside the firing chamber.
From the factory the IV Core kit comes with the Cut Off adjuster set at a mid-point (4 turns) that will return
excellent efficiency. There should never be a need to adjust the Cut Off Adjustment screw.
Screwing the adjuster inwards (Clockwise) will increase the amount of trapped air. DO NOT screw in the
adjuster past 8 full turns from the fully rearward position. NOTE: Screwing the adjuster further in than the
factory setting of 4 turns may cause a reduction in velocity.
IV CORE
IV CORE
IMPORTANT!
The IV Core kit includes two bolts. An all-metal construction bolt and a bolt that has a soft tip attached. We do NOT recommend that the soft tip bolt
is used on any GEO prior to the GEO3. That is, we do NOT recommend that the soft tip bolt is used on: GEO, GEO+, SL91, GEO2, GEO2.1.
Using the soft tip bolt in a GEO prior to the GEO3 may result in the soft tip becoming dislodged either during use or whilst sat gassed up. This is due
to the design differences between the GEO3 Can and everything previous to this. The Can for the GEO3 onwards is designed specifically for use
with soft tip bolts. They are designed to prevent any pressure build-up between the internal 017NBR70 o-ring of the Can and the back of the soft tip,
which can lead to the soft tip being blown off the head of the bolt.
IMPORTANT!
Your GEO MUST be chronographed before use!!
IMPORTANT!
The IV Core kit is designed to replace the Propshaft assembly and Bolt of
your GEO. You MUST use the existing Can from your chosen donor marker.
CLOCKWISE
COUNTER-CLOCKWISE
X2
X14
MAN0016-V2
