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Looks like a Chinese Honda clone engine. Look for a mark on it that says 156FMI, it looks like a 156FMI unit. Good luck finding plastic as you'll need it. Try Brooks Barn or Ali Express to try and identify the manufacturer and buy bits.
AK74 wrote:
Dirt Master 200 (possibly known as the Explorer). Chinese import to the UK.
The problem is it'll possibly have been imported under a couple of different names to get around type approval. It does say Dirt Master yet Google returns next to nothing useful.
You'll need to find out the code for the propriety design these companies use and find a manufacturer using the same design. A quick image search shows that bike also being sold as a Shineray.