2008 RS sudden knock in the engine

[Kenuck]

Had my spyder out for a long run the other day and it performed flawlessly. Took it out today, wouldn't start right away but when it did, it knocked like a old diesel truck. Any ideas?

[cyclelover63]

Maybe partially flooded and a fuel knock?....did it smooth out?

[Kenuck]

warmed it up and knock just a little less but no. Sounds like metal on metal. I trailered it up to the dealer. Can't take any chances it's going to the homecoming! Won't know till next week I guess. It's running on premium non ethanol. Like I said, very sudden, ran great the other day.
26,000km I got it at 21,000km last year so no history on maintenance.

[Kenuck]

The dealer suggested plugs and a valve adjustment. I said ok to plugs but can't see doing a valve check after reading in this forum.

[loisk]

If you do the plugs, make sure you do the leads too - they don't like being disturbed!

[Kenuck]

Exactly what I thought but when I asked the dealer to do that, he said no need. "never seen spyder wires go bad"
seems odd. I think I will just do them myself.