well the inlet manifold was loose on one side, so she would be running rough, the exhaust was blowing a hoolie (not a holie lol) most of the noise is due to the exhaust, the engine still sounded good and strong, unfortunately these aren't 10k a year motors you can use without maintenance, oil changes aren't enough, once a month (on daily use) i would be going round checking everything, what did you cut your oil lines with a beaver? sounds like you a plugged idle jet, i'll go thru the carbs when saves ready, a good 2nd filter is a must (which i know dave is doing) i ran 2 filters for 3 years and think i had a blocked jet once or twice in that time, ran 1 filter on the new engine and have had a succession of blockages.