PRMER BULB STIHL CHECK INSTALL
PRMER BULB STIHL CHECK FULL

I have a MS192t that was running fine, was left on the shelf for a month or so, then wouldnt run up properly.ДЄs my dealer had just sorted out a 200t of mine very well, I thought I'd pass it over to them rather than me having a go and struggling along.ДЄfter two full days of the carb being in the sonic cleaner, replacing all fuel lines, input line, primer bulb, full carb kit and many hours building and re stripping it, its no different. With it running, I played with the adjustments (going as much as 1.5 turns each way) and didn't notice any change in how it operates.Hoping someone can help me out with this one! The gas tank is full and I verified that the fuel pickup is staying submerged the entire time even when it is right side up. Then I can slowly bring the speed back up and mow again (for 30 seconds or so).

The instant I notice the speed dropping, I immediately release the throttle and turn it back on its side and it will sometimes stay running. If I slowly pull the throttle and bring the engine speed up, I can then turn it right side up and mow with it for a while. I found that if I lay the unit on its right side (muffler down, gas cap up), I can start it and it will stay idling. I didn't go into the engine - should I? When I pull the starter, I don't feel anything at the impulse hole on the engine, but I don't know how strong the impulses should be. I followed the impulse passage all the way from the pump through the carb to the engine and all passages are clear. I didn't see a needle clip on the slide, though the needle seems to be firmly inserted in the slide. I can't reinstall the old one it disintegrated when I removed it. Maybe a rubber diaphragm would be better. The old diaphragm looked like thin rubber and the new one looks like reinforced plastic.

The little flaps on the pump gasket look OK but that's still a possibility. It appears the primer bulb assembly contains a check valve and it seems to be working (fuel goes through in the correct direction but not backwards). Also made sure the tiny o-rings between the fuel pump and carb body are in place.

PRMER BULB STIHL CHECK INSTALL

I was careful to install the fuel pump diaphragm in the proper order according to the illustrated parts list as follows: outer housing/shell -> diaphragm -> gasket -> inner housing/shell. Seems like the carb just isn't drawing fuel in properly. I did notice that if I keep pushing the primer bulb once the motor is running, it will stay running longer. I was very careful to note how far out they were so I could put them back in the same spot since presumably, the adjustments haven't been touched since last time it was running. Also disassembled the carb, re-cleaned, and this time, I removed the adjustment needles during cleaning. I went back through the fuel system, checked all of my work. For cleaning, I sprayed every part with carb cleaner, plunged each passage with a fine wire, and carefully blew out with compressed air.ДЄfter doing all of that, it starts easily but won't stay running. Also disassembled the carburetor as much as possible for a thorough cleaning. I replaced the fuel pickup, fuel lines, primer bulb, carb gaskets, and both carb diaphragms. This is the old version with the TK slide carburetor. A friend recently gave me a Japanese Stihl FS80RE trimmer (or brushcutter as Stihl called it).

Prmer bulb stihl check