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Main jet will be the only jet to worry about for WOT. There is no one size works for all. It will be trial and error. What different jets have your tried? Bump up to a 120 main and see if it makes any difference. On the stock engine with the 17/40 gears you probably won't get much more out of it. Until i ported and decked the head the 16/40 combo was pushing it. After porting and decking the head i could easily push it past the 7000 rpm range in 5th gear.
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