RK-TEK Custom Performance Head / Insert - Special Order

Custom RK-TEK Performance Heads & Inserts

Special-order RK-TEK configurations for riders who need a setup outside our standard UK-stock specification.

RK-TEK heads and inserts are configured for UK fuel and UK altitude. This custom-order service allows us to order a different RK-TEK specification to suit your bike and intended use.

Custom options can include

• Riding profile: Enduro / XC / MX and other RK-TEK profiles (where available for your application.)
• Fuel: specification to suit specified fuel/octane.
• Altitude: increased altitude head profiles.
• Application: TBI, TPI, carburettor

How to order: Select either Insert Only or Billet Head + Insert. Please add your bike make/model/year, riding type/profile, fuel octane/type and normal riding altitude/elevation to the order notes. If anything needs confirming before manufacture, we will contact you.

Not every combination is available for every motorcycle.

We will confirm the specification with RK-TEK before the custom order is produced.

Special order item: Custom configurations are ordered specifically to your requirements. 

Custom heads / inserts cannot be cancelled once order is approved.

Fulfilment may be via SMX Offroad or direct from RK-TEK depending on location.

RK-TEK performance

RK-TEK's patented head and insert designs are developed to improve squish action while keeping compression in check, with the aim of producing a wider, smoother and more linear torque delivery. RK-TEK do not require ECU remapping.

Apart from the early 18/19 tpi bikes that had a low oil injection duration, subsequent models increased oil injection so are are pretty decent maps. The standard map is more than enough upto pro level

Carb bikes generally shouldn't need rejetting. If you haven't already rejetted you bike then you will need to before bolting on heads and pipes. Beta nd sherco bikes come very lean from factory to comply with emissions.

Looking for our normal UK-spec stock? Use the standard RK-TEK listing for stocked and incoming UK-spec heads and inserts.