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top end rebuild

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so i have a crf250r that is due for a new top end and there are a few questions i was hoping someone could answer for me. First off i wanna know if a top end rebuild is sumthing i should let a professional shop take care of or if a rookie mechanich like myself could do sumthing like this with reasonable ease?!

while im inside the engine i was thinking of throwin in a hi compression piston and i was wondering wut wud give me the best power for my money(12.5:1-13.5:1) and if i did that would i have to change anything else motor wise?!

hopefully sumone can help me


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