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This is a Robin engine NB40 brushcutter from scrap buyer shop. It is quite a robust model with aluminum recoil starter cover. The muffler does not look like the original part. It also missing cylinder cover. The cylinder and piston looks okay. The design of this model is quite easy to service and still have some genuine parts available in the market. I have clean all component by sand blasting using glass beads#10 and paint the recoil starter.
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Piston ring size: 40x1.5 mm.
Crank case seal size: 15*25*7 and 12*22*7
Crank case bearing size: 15*35*11 (6202) 2 pcs.
Useful links:
Disassembly video: • How to disassemble a R...
NB04 parts manual, www.m-and-d.com/pdfs/ROB/136.pdf
Robin Manual: robinoutdoorpower.com/manuals/