cubastreet Posted February 14, 2019 Share Posted February 14, 2019 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? Quote Link to comment Share on other sites More sharing options...
cubastreet Posted February 14, 2019 Author Share Posted February 14, 2019 I went back to it and noticed the pushrod guide is worn out. Possibly because the stud on that side was a tiny bit bent, I dunno. Anyway I've splashed out $9 on a new guide plate, pushrods, rockers, studs and nuts from eBay. Hopefully that'll sort it. 2 Quote Link to comment Share on other sites More sharing options...
fletch Posted February 14, 2019 Share Posted February 14, 2019 Lol China factor. Might as well chuck some higher ratio rockers in for a bit more grunt while your at it 1 Quote Link to comment Share on other sites More sharing options...
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