912 stumble

Did you balance your prop?  I had a weird vibration as 300-400 ft almost every time and it went away when I had the prop balanced.

Did you check the flywheel sensors? 0,3-0,4mm 

I have not no. It has only occurred after I have replaced my oil,water and fuel lines. Prior to that all was running ok. As I say everything on the horizontal everything checks out. Msgs checks, power checks, idle checks, taxing all fine. Full power down the runway all good…it’s only once I pull back on the stick do I get the stumble.

Dont think the engine is going to stop, just feel perhaps one cylinder is out….

No that’s not something I have done

Stumble (shaking??) at rotation could be an out-of-balance nosewheel tire.