i would tell the guy to do whatever he likes to the boat while you and he are there, but once it leaves, its his. if he's smart he'll run a compression test, pull the plugs to look for fouling and a host of other things. if i were to offer him any type of warranty i would offer that there is nothing on the boat that is going to cause vibration under load(i.e. the prop and shaft a straight). but i would also put a time limit. give him 1 week to test this. other than that, i wouldnt offer him anything. you can go to a motocross dealer, walk away with a 6500 brand new bike and those arent covered by a warranty either, youre not being unreasonable.
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