Carb Heat
OOW- Have your tried pulling the carb heat down half way, it acts like a choke. We have 210 Franklin's and that works for that. Also when it gets chilly it will not start unless you pre heat it. For us 3 primes, carb heat half way down, and it fires into life!
Hope that helps. Call George Kramer at East Coast Helicopters, Gettysburg, PA. His knowledge is exceptional on these,
Darren