What year is your 450? Does it have an ordinary ignition coil or the coil-on-plug setup?
Now, bring it back home and we'll have it sorted. We can come up with lots of ideas, but with no feedback on test results, we are blind. Obviously your dealer hasn't tested everything, else you would have found the problem.
I have access to a '04 and a '05 for reference, so bring it home and we'll start from there.
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