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Message: [QUOTE="jaguar, post: 667733, member: 19340"] Sounds like you have a bad seal allowing unwanted air into the engine. If there's a lot of black crud in your ignition cover then its the left crank seal. Is your carb boot (closest to the engine) in good condition or does it have cracks? How's your engines head gasket? Could of blown it with the excess pressure of igniting the fuel/air mixture very advanced (which may happen one or more times when you shear the woodruf key. I sheared a couple until I used an abrasive paste to wear down the shaft and flywheel where they meet so that they match perfectly. Just put some on the shaft and then put the flywheel on (without the nut) and then press lightly while rotating the flywheel. [/QUOTE]