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Trail Bikes 88cc Big Bore Kit - Opinions? ease of installation?

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Some may have seen my other post. I was thinking of either getting a used TTR90 with BBR suspension and FMF pipe....out of pocket would be approx. $500, once I sell the XR70.....or......Keep the XR and put on a "Trail Bikes" 88cc Big Bore kit, oil pump, and HD spring front and back.....approx $400.00. Money is definitely my primary concern, NEED to keep this project under $500.00, and not sure which route to take? Can anyone tell me if they have installed the TB Bore kit and with what success? The XR already has a FMF complete exhaust. Also, would the modified XR70 ultimately be faster than the ttr90 or not?

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