Check a VIN

December 9, 2025 Service bulletin

Service Bulletin 638 advises dealers to measure and replace the camshaft drive chain tensioner.

Triumph technical service bulletin SB638 for 2024-2025 Triumph Speed 400 and 2024-2025 Triumph Scrambler 400 X.

Bulletin number
SB638
Component
Power train
Summary
Service Bulletin 638 advises dealers to measure and replace the camshaft drive chain tensioner.

Owners of these vehicles have filed 1 complaints in the transmission category.

Vehicles covered

VIN decoder

See the problems and recalls for an exact car

Buying a used Triumph Speed 400?

Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.

Check its history