JetPrime JP ES 059 Honda — SLS/AIS Block-Off Plate — view 1 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandJetPrime
Part numberJP ES 059
FunctionCNC-machined cover plate
TypeSLS/AIS Block-Off Plate
InstallationPlug-and-play, no modification to the original wiring
FitmentHonda CBR 600 RR (2003–2026)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

Twenty-four model years of CBR 600 RR share one cylinder head port, and this plate fits all of them — from the 2003 original through the long European absence to the bike Honda brought back for 2024.

Key Features

  • Covers the Honda CBR 600 RR, 2003–2026
  • CNC-machined aluminium plate with gasket
  • Seals the port after the reed valves come out
  • Original threads, nothing to modify
  • Pairs with the JP ES 062 solenoid eliminator
  • The longest fitment span in the range

A Supersport Racing Staple

The CBR 600 RR has been a club racing default for two decades, and secondary air removal has been on the preparation sheet for just as long. In many series the machine is required to run a standard airbox, so tidying what sits above the head is one of the few areas where anything can be done at all.

Heat Cycles Are the Test

What defeats an improvised cover is not pressure but the constant expansion and contraction between a cold start and a hot head. A race bike sees that cycle several times a day, every event. Aluminium expands at a rate close to the head itself, which is why the fastener keeps its tension where a bodged plate loosens.

Easy Access on an Inline Four

The reed valve housings sit along the top of the head, all four reachable once the airbox is out. Compared with doing the same job on a V-twin or a V4, this is straightforward — one of the reasons it is such a routine modification on this bike.

Fitment

  • Honda CBR 600 RR (2003–2026)

Road Approval

None. Closed-circuit and race use only.

Specifications

  • Brand: JetPrime
  • Part number: JP ES 059
  • Type: SLS/AIS Block-Off Plate
  • Function: Seals the secondary air port in the cylinder head
  • Installation: on the original mounting points, no drilling
  • Fitment: Honda CBR 600 RR (2003–2026)
  • Road approval: none — closed-circuit and race use only
FitmentWhich bikes this fits
  • Honda CBR 600 RR (2003–2026)
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