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Installation & Safety Notice – “Monza” Screw-On Fuel-Cap Triumph Twins 2001-2025
Installation & Safety Notice — Monza-Style Flip-Top Fuel-Cap
Triumph Bobber, T100/T120, Street Twin, Thruxton, Scrambler 900 with M38×2.5 neck
This aluminum flip-top cap replaces the OEM screw cap for faster refuelling and a vintage look. Venting, emissions and sealing rules differ worldwide — review the table below before road use.
| Region | Key Rules | Your Checklist |
|---|---|---|
| USA | EPA 40 CFR 1060 evap (anti-tamper) | Cap is vented one-way (vacuum break only) — evap canister remains functional. Do not modify breather jet; retains emissions compliance. Hand-tighten only; torque ≈ 2 N·m. |
| EU / UK | Euro 5 evap limit & UNECE R34 fuel integrity | Vent pierce ≤ 2 g m⁻² d⁻¹; PCV line unchanged. MOT/ITV will fail if cap leaks — check seal yearly. Logo engraving ≤ 4 mm relief → no sharp edges. |
| Australia / NZ | ADR 79/04 evap & ADR 42/04 projections | Cap must self-vent but not spill at 45° bike lean — flip-top latch tested to 10 kPa. Beaded rim ≥ 2.5 mm radius meets sharp-edge rule. |
Universal Fitting Instructions
- Remove OEM cap; inspect filler-neck thread (M38 × 2.5) for burrs.
- Lightly oil supplied O-ring; seat O-ring in groove.
- Screw Monza cap by hand until stop, then back ¼-turn so flip-top lever points rearward.
- Open/close several times — verify latch clicks; cap should not rattle.
- After first heat-cycle, check for seepage; replace spare O-ring if needed.
Maintenance & Care
- Polished or chrome: wipe with microfiber; use non-acid metal polish.
- Black anodized: clean with pH-neutral soap; avoid abrasive pads.
- Replace O-ring annually or if fuel smell is noticed.
⚠️ A blocked vent, damaged seal or loose latch can cause fuel leakage, tank vacuum collapse or fire. Install and use at your own risk.
⚠️ California Proposition 65: This product can expose you to chemicals including nickel and hexavalent chromium. More information: P65Warnings.ca.gov.