Hi John,

You can usually wire open the carb and do fine.  I would prefer a venturi and NVA, though.  Randy Smith, Leonard Neumann, Scott Riese, etc., can come up with those pieces.

Big Bear

John,

If you decide to use the R/C carb, here's what I do.  I set the mixture with the carb fully open.  Then I reduce the RPM by closing the carb to get the RPM I'm looking for and lock it at that setting.  To get the desired lap speeds, I set about 10,000 (I'm flying an OS 45 FSR and a TT 42 GP).  I've had no problem using this method and by reducing the carb, I get excellent gas milage.  I also fly NVA's, but I just never got around to modifying the R/C engines and use them for sport flying only.  The R/C engines are timed so high that I cannot run them with the carb fully open.

Paul

John,

Here's a picture of the way I lock the carb.  But, some carbs allow you to tighen the barrel travel limit set screw.  That would be my first option, but on this carb I couldn't get that to work.  Regarding the adjustments after I set the carb, I don't change the setting.  I just use different pitch props.  However, you could make minor adjustments by altering the threaded fitting on the carb arm.  Be very careful of the prop when you are establishing the initial setting.  Also, I use an electric starter and often have to put my thumb over the carb throat creating a partial choke to get the engine to start when cold.  Hope this helps.

Paul