Re: QD-10 that runs horrible. Expert advice needed.

[gjonz]

Couple of things…that donut shaped gasket in the service bulletin keeps fuel from going past the jet and traveling up into the jcarb throat unmetered. If it is dried out or loose it must be replaced. Some big twins also had this on their carbs, some did not. I always use them. I think Vintage Outboard sells the carb kit for these motors.

Finally given that you can flip that high speed needle around with a finger tip tells me your packing nut is pretty loose, or the packing itself is shot. That should be a bit of a challenge to turn that needle. If not you are likely sucking air through the nut.

By the, double check the plug wires along the mag plate. Make sure there is no worn spots. Had one wea so when the mag plate turned it shorted out the top cylinder intermittently. Don’t think this is your issue, but worth a look see.

Greg