on a new engine i would say yes, but if yours old enough to to have a carbon build up already then i would think it wouldnt be all that dire.
on one of my trips i was half way to deadhorse (alaska) and having carb problems, pulled out the plug to check things out and tried to turn over the engine, the gush of air sent a small but very noticible piece of dirt stuff into the air, and murphys law stright into the engine. thinking of total disaster if i were to start the engine, moments later i guuy just happened to came around the corner on a bicycle, and after a chat with him (as one does) he said if the engine wasnt new it should be fine.... well i had to gamble and fixed it up and drove another 17,000+km, did have a compression check back home and everything is fine. but my engine wasnt new with something in the neighour hood of 65,000km worth of sludge in the engine. and yes its sludge, i pulled off the carb and had a good look see. 100,000km+ and counting, and to this day i never have bothered about fixings it.
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