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Before divin in and doin changes, study the different threads and Tech. info here. There's alot of other factors that determine different jetting, air filter style, elevation, etc. play into your choices, if any is needed. Check tech. info on 'reading plugs', serious, need to check that info first for a start. How it runs low-end, mid-range, top-end and a whole LOT of other factors........good info and reading!