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Lifan rocker problem


cubastreet

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I've got a Lifan 420cc motor in my mulcher which was working fine until today when it started crackling then died. The rocker arm had slipped off the side of the inlet valve.

It's obviously been a bit wonky for a while as the bit where it pushes the valve was quite worn on that side. I filed it a bit better, which didn't help, it just keeps slipping of the side of the valve.

I swapped rockers over which improve things a little and it'll idle ok but with increased revs it just starts crackling like mad.

The pushrod seems straight, the only thing I noticed is that the inlet pushrod spins quite a bit when I turn the engine over, which the exhaust doesn't do.

 

Any idea what's going on here?

P_20190214_125424.jpg

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