Triumph Gasket Kit, Cyl Head · T3990144
Genuine part · Fits 3 Triumph models
Low stock at Triumph
$516.55
Limited availability
Listed for these motorcycles
Listed in Triumph’s parts catalogue for these motorcycles. Fitment is Triumph’s data, not a guarantee from us — add your motorcycle above and we check it against your frame number where Triumph splits the part.
Where it sits on the bike
Cylinder Head & Valves
Street Cup · Cylinder Head, Valves, Pistons, Liners, Camshaft & Balancers · callout 25
View diagram →
Gasket Kit, Cylinder Head
Street Cup · Service Tools, Literature & Touch-Up Paint · callout 1
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Cylinder Head & Valves
Street Twin & Speed Twin 900 · Cylinder Head, Valves, Pistons, Liners, Camshaft & Balancers · callout 25
View diagram →
Gasket Kit, Cylinder Head
Street Twin & Speed Twin 900 · Service Tools, Literature & Touch-Up Paint · callout 1
View diagram →
Prices and availability are a dated snapshot, not a reservation — Triumph supply is read from Triumph’s catalogue and our shelf count is read from our own system. Both move. Triumph supply checked Oct 15, 2026. Shipping and tax are calculated at checkout.
Genuine Triumph parts from Southern California Motorcycles, 515 W Lambert Rd, Brea, CA 92821 · 714-256-6700