I am using a WT-434 9.53mm venturi. I use this carb on several of the conversions I do. I like the throttle shaft because it sits up a little higher than most. Also has a choke. IF the WT carb does not work well I will try a WYK-61 a 9mm carb but with a high needle. The low can be adjusted by removing the cap on top of the barrel. The WYK-38 is supposed to be 10.5mm but the book and online shows 12.8 I think. My local vendor is verifying this for me. I hope to run mine this weekend even if I don't have the header done. I hope to get close to 7000 on an 18/8 Zinger. Then I may order the cam and see what I can get out of it. Would be nice to see a strong 7500 but who knows. I plan on using it in a Balsa USA Sopwith Pup 1/4 scale.

Tim