JetPrime JP ES 033 Yamaha — SLS/AIS Block-Off Plate — view 1 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandJetPrime
Part numberJP ES 033
FunctionCNC-machined cover plate
TypeSLS/AIS Block-Off Plate
InstallationPlug-and-play, no modification to the original wiring
FitmentYamaha FZ8 (2011–2015) / Yamaha FZ8 Fazer (2011–2015)
Road approvalNone — closed-circuit and race use only
DescriptionThe whole story

Once the reed valves come off an FZ8's cylinder head, the port they left behind opens into the exhaust tract and has to be sealed properly. JP ES 033 is the machined aluminium plate for that.

Key Features

  • Covers FZ8 and FZ8 Fazer, 2011–2015
  • CNC-machined aluminium plate with gasket
  • Seals the secondary air port permanently
  • Uses the original threads
  • Pairs with the JP ES 010 solenoid eliminator
  • Standard parts refit if needed

Why Improvising Fails

The obvious shortcut is a piece of sheet metal and high-temperature silicone. It survives a season, then the joint works loose through the heat cycles and the engine starts to whistle somewhere that is difficult to locate. A machined plate with a proper gasket saves that diagnosis.

An Ageing Bike

These are now more than a decade old, and the reed valves themselves are a known wear item — thin flaps working in a hot, dirty environment eventually stick. Sealing the port permanently removes a maintenance item rather than deferring it.

Naked and Faired Alike

Yamaha sold the FZ8 as a naked bike and as the half-faired Fazer. The engine and cylinder head are identical, so one plate covers both — only the amount of bodywork you take off to reach it differs.

Fitment

  • Yamaha FZ8 (2011–2015)
  • Yamaha FZ8 Fazer (2011–2015)

Road Approval

None. Closed-circuit and race use only.

Specifications

  • Brand: JetPrime
  • Part number: JP ES 033
  • 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: Yamaha FZ8 / FZ8 Fazer (2011–2015)
  • Road approval: none — closed-circuit and race use only
FitmentWhich bikes this fits
  • Yamaha FZ8 (2011–2015)
  • Yamaha FZ8 Fazer (2011–2015)
07 · Support

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08 · Paddock

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