I had the same problem with a 70 Surpass. It's not too hard to fix it.

When you wind the needle right in the knurled part bottoms out on the needle carrier rather than the valve seat. Remove the needle then the carrier from the carb. Carefully file down the carrier where the knurled part of the needle touches it so that the needle can be adjusted further in. Use a fine tooth file and make sure you clean the carrier thoroughly before re-assembling. File it enough that the needle bottoms out on the seat with a small gap between the knurled section and the carrier.

Re-assemble and you're done.

Dave H