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Here's what Brock says:

On multiple occasions lately I have been approached by customers who have complained about deceleration pop from a ZX-14 in STOCK form after installing our exhaust system.

Example: Pops with NO TRE installed and/or pops with the secondary throttle plates IN PLACE?

After speaking to one of Kawasaki's technical representatives about the whole "decel pop" issue at length last month. We concluded that most deceleration pop is usually caused from a lean condition from the emissions system injecting fresh air into the exhaust ports. Of course, Brock's Performance has known about this for years and we have cured bikes accordingly. Our ZX-14 systems come with a block off plug to remedy this situation.

BUT, we also concluded that any type of INTAKE LEAK can also have the same affect by allowing air to enter the intake tract. An improperly or disconnected vacuum hose or loose throttle body to inlet clamp allow unwanted air to enter the engine.

I began forwarding this information to the troubled stock configuration owners.

NEARLY ALL reported that the hose clamps attaching the throttle bodies to the engine inlets NEEDED to be TIGHTENED! Every one responded that after tightening the clamps- the pop went totally away or became nearly un-noticeable.

I believe the loose clamp situation may also be plaguing the TRE and/or Secondary plates removed riders while the situation is being masked as a result of these modifications.

I strongly suggest that ANY ZX-14 owner who is experiencing decal pop should remove the "Ferrari" body panels and tighten the clamps which attach the throttle bodies to the engine inlets.

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