If you want something neat, remove the plate, drill and tap a center hole for a muffler pressure tap (or solder on a piece of 5/32" brass tubing). Solder the current hole closed. BME sells a plate already set up for most Walbro carbs. I think it costs about $25.

http://www.bmeengine.com/html/accessories.htm


BME CARBURETOR DIAPHRAGM COVER


The new BME Carburetor Diaphragm Cover helps your engine to maintain consistent air pressure through your carburetor diaphragm at all times. This virtually eliminates the problems encountered when you adjust your carburetor on the ground, but experience inconsistent airflow and pressure entering your carburetor in flight, due to varying airspeeds.

This inconsistent airflow can cause your engine to go lean or go rich depending on whether your plane is sitting still, flying slow, or at high speeds. Machined from Billet Aluminum, this carburetor diaphragm cover comes with a nipple and blue mounting bolts.



It fits any engine using a Walbro SDC style carburetor, including BME twins, DA100 & 150, Quadra75 & 100, Brison 4.2 & 6.4 etc. The carb cover for for the BME twins also fits other engines using Walbro WGA ,WB and WJ series carburetors. The BME Diaphragm cover is now also available for the BME 44 & 50cc single cylinder engines.

This is a great item to help reduce carb mixture from fluctuating in flight due to pressure differences affecting the diaphram. Simply remove the old cover and install the new BME cover with the 4 bolts included. Then run a fuel line from the nipple to inside the fuse where stable air is.

PRICE: $25.00 each