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Message: <blockquote data-quote="Tazza" data-source="post: 2660" data-attributes="member: 82">Its hard to say, as what you will be feeling is the air blowing out not when it is drawn back in. Try holding your finger over the tube lightly while the engine is running then let it go. Don't hold it too tight or you can blow your seals out if you build up too much pressure.If its running well now, without stalling i would not worry about it. You did say its easy to start. If its still easy to start, your compression must still be good.The 743 that i have with lost of blow-by is so bad, that when its under a good load, it blows lots of smoke out the breether tube.If you really wanted to know the state of your engine you will need to do a compression test.</blockquote>