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Posted

The 570 would definitely have more power, it depends on what type of riding you are doing, all of mine are 400s and for what I use them for I do not need anything more powerful. Not really sure what you are looking at, do a side by side spec comparison, that might help you decide.

Posted

A quick look through the specs show they are almost identical except for the displacement, and the engine design.

The 450 is a single over head cam and the 570 is a double overhead cam.. The 450 is almost certain to have a steeper power curve with more of it's power in a narrow range, and the 570 will have a wider flatter power band. If it was a two wheeler the difference on the road would be that the 570 could hold high revs comfortably for longer, and seem slightly less sporty to ride. The 450 would wind out into it's power band quickly, with the sensation of more power, but then make you feel like you wanted to change up a gear more often..

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