125-200cc oh the dilema!

As most of you know I got a cracking 08 cr144 a few weeks again. Well I had stator issues and ended up with a complete 01 cr 125 to get the electrics off. The 125 needs a re-build and I was just going to sell it on but now im thinking of keeping the motor and doing a full re-build and doing a 165 job on it. The only difference I can see with the two motors is tje breaters on the side of the barrel. Is the engine the same and is it worth my time.

Very good motor and I like the old cylinders. The 01 CR125 will make a great bike no matter what you do with it once you get the suspension working well. Easily would be a great candidate for big boring. Plus that has the wider ratio 6 speed even though it says CR compared to your 08. A definite plus if you big bore it.