Engine warranty terms & conditions.

Reconditioned / exchange engines and new engines: 12 months unlimited miles, Mainland UK & Northern Ireland only.

Covers bottom end and top end — crankshaft, connecting rods, camshaft, bearings, pistons & barrels, cylinder heads, rockers, pushrods/tubes and flywheel.

New turnkey engines: 1-year warranty (quotes/invoices accepted after that date). Coatings are not covered.

Gearboxes we sell are covered by the warranty of our chosen gearbox specialist.

Refurbished builds are recorded on video running as proof of completion. No warranty on used parts fitted, or on setup / tuning beyond that.

All engines must be tuned immediately on a rolling road to ensure correct fuelling. Failure to do so invalidates the warranty.

Proof — a VAT receipt and dyno graph print-out — will be required in the event of any claim. Ask the operator not to perform power runs during running-in.

A 500-mile running-in period is required, not exceeding 3,000 rpm. Once run in, treat the engine with care — this is a classic air-cooled engine and will not withstand being driven like a modern car.

Oil must be changed after the first 20 minutes of running (done by us on turnkey engines), at 100 miles and at 500 miles. The 500-mile service must include: check/reset tappet clearances (excluding hydraulic-lifter engines), oil change, and check/reset ignition timing.

The engine must be fitted and serviced by a reputable VAT-registered garage, with proof provided in writing.

Stop the engine immediately at any sign of part failure or a sizeable oil leak. Oil must be checked regularly and all tinware must be in place. Only sizeable oil leaks are dealt with under warranty.

Ancillaries and consumables — distributors, coils, carburettors, alternators, clutch discs/pressure plates, filters, plugs, leads, strainers, points, main oil seals — are covered by the manufacturer’s warranty where applicable, not ours. At our discretion parts may be supplied as a goodwill gesture within 28 days.

Engine tuning (carbs, EFI, timing, points, spark plugs) is not covered. We perform the initial tune and start-up on turnkey engines but further tuning on a rolling road is required, and no guarantee is given that an engine remains in tune during transit.

Failures caused by poor installation or maintenance by the customer or a third party, allowing a minor issue to become a major fault, fair wear and tear, misuse, neglect, accident, incorrect fuel or oil, racing or speed trials, unauthorised modification or repair, external influences, or failure of existing ancillaries.

Cosmetic appearance is not covered — paint/powder-coat variation, wear, rust and similar. Images or video of completed work will be taken as acceptance of cosmetic quality. Tinware is coated black unless written instruction is received at least one month before completion.

Any engine or part requiring inspection, repair or replacement under warranty must be returned to Aircooled Hut UK. All removal, packaging, transport and return shipping costs are the customer’s responsibility, whether the claim is accepted or rejected. No warranty work is authorised or reimbursed until the engine or part has been inspected.

We are not responsible for consequential losses — towing, courier charges, car hire, accommodation, loss of earnings or overseas recovery.

Faults must be reported immediately and confirmed in writing with photographic evidence. Every returned engine is inspected for signs of overheating and user error. Overheat evidence (including triggered overheat tabs) invalidates the warranty. Damage caused by overheating, poor fitment, carelessness or intent is chargeable at current labour rates plus parts.

The warranty is not transferable. Shipping insurance is optional; damage or loss in transit is between customer and courier. Claims exceeding £200 are not paid until any insurance settlement completes. A replacement engine under warranty carries the balance of the original warranty period.

Engines with camshafts exceeding 0.350” lift, cranks larger than 69mm, over 100 BHP, or fitted with EFI, turbocharging or nitrous are classed as Race Engines and are not for street use. Any road-based engine used for racing is also classed as a Race Engine. Race Engines carry a 30-day limited warranty on the long block only, excluding tuning, cosmetics and cooling systems.

All parts, engines and gearboxes must be checked and any fault or damage reported within 14 days of delivery. Nothing in this warranty affects the customer’s statutory rights. Trade customers must ensure these terms are passed to their customers.

Aircooled Hut UK Ltd reserves the right to amend these terms at any time without prior notice.