Jensenman
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Yes, it's normal. Dellortos have a high idle provision which is nothing more than a poorly controlled and noisy vacuum leak. Use it as little as possible; whenever you hear that the cold start mechanism is also sucking extra fuel. That means a very rich mixture which not only can foul spark plugs but can 'wash down' cylinder walls with extra fuel. I use mine till the engine starts, leave it out for about 5 seconds, then push it closed and use the throttle pedal to keep the engine running.
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