Posted By: LL340Rag
How do you lean out a ThermoQuad? - 07/04/09 02:44 PM
My 340 is running so rich I can't even go near it when it's running. Other than the simple 2 screws how do you adjust the mixture to lean out a thermoquad? It's a 6138S if that makes any difference.
Posted By: MY340
Re: How do you lean out a ThermoQuad? - 07/04/09 02:54 PM
Mixture screws and idle speed need tuned first. Check timing too.
Lowering height of metering rod tree, change to fatter metering rods and smaller jets would be other ways to lean out a TQ.
Adjust air door opening for leaning out secondaries.
Hopefully your o-rings or jetwells aren't leaking.
Posted By: LL340Rag
Re: How do you lean out a ThermoQuad? - 07/04/09 02:59 PM
It was just professionally rebuilt so no prob with the carb. It just really needs to be setup for the engine. TKU.
Posted By: LL340Rag
Re: How do you lean out a ThermoQuad? - 07/06/09 12:23 PM
Any good reference books? The factory manual doesn't help much.
Posted By: fox
Re: How do you lean out a ThermoQuad? - 07/06/09 03:39 PM
If it is running rich at idle, you don't need to get into the rods / jets.
I'd suggest you start it and look down the primary bores to see if it is dripping. Be VERY careful that it doesn't back fire! Don't touch the throttle as you do this.
If you see it dripping fuel, you found out why it is rich. Now figure out why it is dripping! Float to high, vacuum signal too high from blades to far open, etc.
Posted By: ademon
Re: How do you lean out a ThermoQuad? - 07/06/09 03:45 PM
ask the guy who rebuilt it if the bowl wells were resealed.
