Yz 125 not pulling to well

Hello. Basically my yz seems to be struggling to pull me up a hill even in second gear! Il double clutch it loads goin up and I'm not exactly goin slow goin into the corner at the bottom. And ideas what the problem could be?? I was thinkin maybe piston and rings because it takes ages to start wen cold and also could it be the chain and sprockets?? Any help I would be greatful of thanks.

Check your compression. I think it's time for a new top end.

Il have a look at it this weekend thanks mate!

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