David good morning,
I have been using a lot of OS7d carbs for the last 30 years and the only words I can send to OS are CONGRATULATIONS FOR THE SUPERB WORK!!!!!For your information this is the carb that made OS number one in the world for reliability and easy tuning.A friend of mine had a super tiger s3000 engine, and every flight was a nightmare (engine fail).I gave him a 7D , and until today the s3000 never had an engine failure.You will see that it is very easy to tune.Best regards.
Aris