Slide switch Stihl BG 75 blower will not turn off engine. How to assemble parts on switch

I don't have much experience with Stihl products but I do have a couple of disc cutters, both of which had a short life and suffered piston damage.

I suspect the air cleaner isn't as efficient as it should be.

Hi Guym,check out this link. https://www.stihlusa.com/WebContent/CMSFileLibrary/InstructionManuals/STIHL-BG-KM-Owners-Instruction-Manual.pdf

try this link.
https://www.google.co.uk/webhp?sourceid=chrome-instant&rlz=1C1CHBD_en-GBGB719GB719&ion=1&espv=2&ie=UTF-8#q=Price+for+the+Stihl+BG+86+C+Blower

contact good auto publication shops ( autodata) and get a copy .

it connects to the metal body via a small lug spade type connector
usualy this ground wire is used to by the switch to turn it off

read valves are used by two stroke engines its a V shaped flaps
and is used to feed fuel into the cyclider
it takes the place of a puch rod valve in 2 strokes
and is located at the head end of the intake manifold just after the carborator

STIHL BG75

http://www.h-machine.jp/part_list/stihl/stihl_BG%2045,%20BG%2046,%20BG%2055,%20BG%2065,%20BG%2085.pdf

Illustrated parts list of BG 45, BG 46, BG 55, SH 55, BG 65, BG 85
including the breakdown of the C1-s50 and C1-s55 carbs

when engine cool,, spray wd 40 into the switch and work it a dozen or so times and clen it out