Aprilia AP8163441 Steering Yoke with Stem – Sport City 125, 200, 250 and 300

The Aprilia AP8163441 steering stem base is the lower fork plate with integrated steering stem: the single piece that holds the two fork tubes and rotates within the frame's steering head. It is the original spare part for Aprilia Sport City scooters across all generations – 125, 200, 250, and 300, including Cube and Street models. New, never-mounted replacement part.

✓ Strengths

• Plate and stem in one piece – the stem is integral to the base, not an add-on: this is the original steering geometry, not an assembly (observed from product photographs).
• Fork tube seats already machined with clamping cut – the two seats have the notch and housing for the clamping bolts, ready to receive the fork tubes (observed from product photographs).
• Original Aprilia spare part – on a component that bears the front braking load, tolerances and steel quality are not minor details.
• A single code for eight years of Sport City – from the first series E2 in 2004 to the Street in 2012.
• Ground and clean stem – the bearing seat surface is new, not marked like the one you are removing (observed from product photographs).

Technical Specifications

* data observed from product photographs, not declared in the catalog.

Vehicle Compatibility

Complete list from the official Aprilia spare parts catalog: 3 model families and 6 versions.

Not sure about the version of your Sport City? Contact us for more information: with your frame number, we can verify the exact required part number before you order.

Who It's Perfect For

This is the replacement part for anyone who has had a front impact – a curb, a rear-end collision, a fall – and finds their scooter "pulling" to one side or the handlebars misaligned with the wheel. It's also the part needed when the steering head has been left loose for too long and the bearings have left their mark on the stem: at that point, the steering gets stuck in the straight position and cannot be fixed by adjusting the play. It's the choice of workshops that are straightening a Sport City and want to start with the original geometry, and of those putting a damaged vehicle back on the road.

Frequently Asked Questions

What exactly does the supply include?
Only the steering stem base with integrated stem, as shown in the photographs. It does not include steering bearings, lower race, lock nut, stem nut, or fork tube clamping bolts: these are separate part numbers, to be reused or ordered separately.

How do I know if my steering stem base needs to be replaced?
Typical symptoms include handlebars misaligned with the front wheel, the scooter tending to lean to one side hands-free, or the steering getting "stuck" in the straight position even after adjusting the play. The latter case usually means the bearings and the seat on the stem are worn out.

Do I also need to change the lower race?
Almost always yes. The race is pressed onto the stem and must be extracted from the old one to reassemble it onto the new one: in most cases, it gets damaged during extraction. It is advisable to get a new one along with the bearings to avoid having to disassemble twice.

Is it the same part for Sport City, Cube, and Street?
Yes, according to the official spare parts catalog, code AP8163441 covers all three generations, from the 125-200 E2 of 2004 to the Street 125 and 300 of 2012. The table above lists the exact versions.

Can I install it myself?
This is a job for a workshop. The steering stem base bears the load of front braking: it requires disassembling the fork, extracting and pressing the races with the right tools, and adjusting the steering head play. Incorrect play can be immediately felt in the ride and is dangerous.