I have a OS 70 fl. It is giving me a little trouble. It has a great idle, and the high speed needle seems about right on the ground. When it is in the air however the top rpms sound like they go and come. I am wondering if air is getting in around the high speed needle and leaning it out in the air. It is on a 40 size stick. When it runs right is great fun, but you know when it does not well its not fun. In the past I have seen some people put a small piece of fuel tubing on the needle and cures a leaking problem. If this is the fix how big of a piece should be used? Anyway a little help would be greatly appreciated.
Alan