Stihl km 100 bogging down

[carsmarco252]

Hello. 

I have a stihl kombi engine. When I try and rev it up it just bogs down and cuts out. Sometimes if you finger the throttle you can get it to pick up and sometimes it works fine but on occasion when I have a big job it just won't work. Its been into the repair shop twice and always seems to work when it goes on. Of its related the primer bubble doesn't seem to fill, just a tiny amount of fuel comes through the bottom and that's it. 

It's had a service and the valves reset. 

Thanks everyone. 

[spudulike]

Try fitting a new fuel filter if it hasn't been replaced.

Having the carb apart and checking the gauze strainer if the fuel filter doesn't fix it.

The tappets often need adjustment but sounds like they have been done - the pull start being difficult to pull over is a sign they aren't adjusted correctly.

I have had one unit where the valve timing was one gear tooth out. The machine would never run as it should if this is the case. This would only occur if someone had stripped it down and got reassembly wrong!

[carsmarco252]

Thankyou. 

[spudulike]

I have had one that was sluggish from idle but revved out after that, I changed the accelerator pump and it sorted it. You only noticed it as a hesitance to pick up off idle when grabbing a fist full of throttle.