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2008 YZF-R125 (180cc)
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afaik it'll physically fit, i'm 99% sure they didn't change any of the main metal bits., The issue will likely be more with sensors and stuff like that. You will probably need to do some swapping over of sensors and whatnot from your old motor.. e.g. I think the TPS is different on gen1-2, for starters.
 
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