Stihl BR850 blower manual

[StarTech]

That model number is 4283/01C which means it is revision C. The rest of the number are factory and date codes.

 

[ChiefH]

A picture of the whole unit would be helpful. I have worked on a BR550 and to take the covers off is a real puzzle as they are overlapping bolt holes and some inter connections. It can be done, but the learning curve is steep for the disassembly and reassembly. I had to replace the priming bulb and that cause me to get into the whole unit. I see some of the same on other Sthil units.