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Haha sorry, had a long day hence the usage of wrong names. I've got a KX250F but this is just my **** around toy. Well, I've done the valve clearances and they are fine so it must be something to do with the piston. Here's a couple pictures of the engine and my old piston..

Hmm I set them when I first put everything back together but I'll double check them tomorrow. The head is exactly the same size as the stock 125 Lifan one, the old one was damaged so I replaced it instead of getting it honed. But I had to get a slightly bigger piston but the shop I bought it...

Hey, Just did a fresh top end rebuild on my Lifan 125cc. Put new cylinder, gaskets, piston and piston rings. It rides perfect and always starts either 1st or 2nd kick. The problem I'm having is that it makes a pretty loud ticking noise from the very top of the engine (near the head). I...

Hey, I've recently bought a Hummer 250 and its got the Zongshen 250 engine in it. Just wondering where I can get a service manual for it as I need to rebuild the engine on it. cheers