There's no access to the carb intake venturi as I have Tony Clark 90^ elbows installed on them so the cowl needs no holes cut into it to clear the carb. The inlet faces rearward and towards the firewall......
I've used these things many times long ago and you would think that I would recall something like this, but I don't. I must say that if they were mounted stock (no Tony Clark elbows back then) on an airplane 20 years ago they would've been sticking through the side of a cowl so I'll bet I was priming it with my finger....
I have them on a test stand right now but thought I'd toss the question out there to get some perspective. I can get them running but on the stand I have been priming with my finger. My battery used for my starter is weak and I can't crank it over too many times without it dying.....I have one on order.