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You may need larger than a 115. I only said that because its what I have, but elevation plays a key role in that so to know for sure you'd have to do a plug chop. It was only a jumping off point. And shimming the needle means to put a small washer or two between the slide valve and the retaining clip for the needle. Basically it just moves the needle up allowing more fuel for 1/4 to 3/4 throttle. But with anything its trial and error. These are just recommendations of what has worked for others.
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