At Sparks & Spanners, we believe the heart of every motorcycle deserves expert care. Whether it’s a vintage twin or a modern multi-cylinder engine, we offer complete engine and gearbox rebuild services — carried out with precision, patience, and pride.
We handle everything from diagnostic strip-downs and cleaning to full rebuilds, bearing replacement, and crankshaft truing. Every job is built to spec and tested before it leaves the bench, ensuring your engine performs exactly as it should.
We tailor each rebuild to your bike’s needs — from a minor refresh to a complete overhaul.
Complete disassembly, inspection, and cleaning
Replacement of worn components (bearings, seals, gaskets, piston rings, valves, etc.)
Crankshaft truing and balancing
Cylinder head service (valve lapping, seat cutting, shimming, reassembly)
Precision torque and clearances to manufacturer specification
Bench testing prior to installation
Whether it’s wear over time, oil leaks, or a full restoration project, we rebuild engines to run as good as new or better.
Smooth gear changes depend on precision. Our gearbox services include:
Inspection and assessment of gears, shafts, and selector forks
Replacement of worn or damaged parts
Re-shimming and bearing replacement
Reassembly and testing to ensure smooth engagement
Oil seals and gaskets renewed throughout
We work with both classic manual boxes and modern constant-mesh systems, diagnosing issues such as jumping out of gear, rough shifting, or worn bearings.
Every rebuild includes:
Initial inspection and estimate before any work begins
Genuine or high-quality replacement parts
Thorough cleaning of all components
Professional assembly using torque and alignment specs
Post-build oil fill and test rotation
At Sparks & Spanners, we combine technical knowledge with traditional mechanical skill.
From single-cylinder classics to complex multi-cylinder engines, we’ve rebuilt a wide range of powerplants with the same care and attention to detail.
We take pride in doing things the right way, with craftsmanship you can trust and results you can feel every time you twist the throttle.