Road Test Judgement on a Modified Bike
A customer brings in a bike with an aftermarket exhaust, a piggyback fuel controller, and a pod filter fitted elsewhere. It runs roughly at small throttle openings and stalls occasionally at idle. The customer wants a road test to confirm the fix and asks the technician to "give it a proper run" to check top-end fuelling. The bike is not the technician's, the workshop insurance covers road tests within legal limits, and the local speed limit is 60 km/h. The shop has a dyno but it is booked for two days.
1. How should the technician scope the road test, and why?
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The road test must be scoped to what is legal, insured, and diagnostically useful. "A proper run" to check top-end fuelling implies speeds well above the 60 km/h limit, which is neither legal nor covered by the workshop insurance as described. The technician should decline that framing and propose a test that reproduces the reported symptoms: small-throttle roughness and idle stall.
A structured test at legal speeds can confirm idle stability, low-speed driveability, and whether the fault is temperature- or load-dependent. Top-end fuelling verification is better done on the dyno, which is booked in two days. The technician should explain the constraint to the customer and book the dyno slot rather than improvising on the road.
2. The bike stalls at idle during the test. What is the safe and correct next step?
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A stall at idle is a fault, and continuing to ride in traffic risks a crash. The correct step is to stop in a safe place, assess whether the bike can be ridden back safely, and if not, arrange recovery rather than pressing on. Record the conditions of the stall: engine temperature, throttle position, whether it restarted immediately, and any dash warnings.
Back at the workshop, check the basics affected by the modifications: intake sealing after the pod filter fitment, fuel controller connections and settings, idle speed, and any stored codes. The modifications mean standard settings may not apply, so follow the controller's guidance. Do not adjust fuelling by guesswork; gather data first.
3. The customer insists the bike is fine and wants it back before the dyno slot. How do you respond?
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The technician should be clear that the bike is not confirmed fixed and that releasing it as repaired would be misleading. Explain the observed stall, the conditions, and the risk of stalling in traffic. Offer the options: leave the bike for the dyno slot, or take it with a written note that a fault remains and advice not to ride until checked.
If the customer chooses to take it, record their decision and the advice given. Do not sign off the job as complete. This is a judgement call balancing the customer's wishes against safety and professional honesty; the customer's insistence does not transfer responsibility for a known fault to them alone.