The only thing I'd comment on at the moment, being able to see this from both sides, so to speak, is to ask how you checked the accuracy of the new speedo when you fitted it?
Quote:
He checked his speed on the digital speedo which I fitted and since it read 28mph he thought no worries and continued on
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If it was accurate then, is it still now???
You need to be on solid ground that what your lad says he saw on the display was actually the speed that the bike was doing.
Before you go forward, I'd ensure that you're happy that your lad was looking at an accurate indicated speed first...if not & it was out as a mate found when he compared his GPS to his digital bike speedo on a streetfighter he'd built ( 26% under reading in his case indicating 37 at a true 50mph, even though it was fitted as per the instructions! ) you may be heading for a bit of an egg in face type scenario.