2000 Blaster carb. switch adjustment

[yooper]

I have not owned a machine with this technology, so I'm in need of information. I have tried to make an adjustment to get it to idle and it's very sensitive. When tuning, I hit a point about 1 1/2-turns out, where the rpms climb very quickly and the engine begins to back fire. If turned back slightly the engine dies. Is the switch bad?

 

[yb200]

are you turning the knob on the side or top of the carb?

 

[yooper]

The adjustment screw for the carb switch is located on the top of the switch housing. On this machine, access to the adjustment screw is under the seat.

 

[yb200]

is your air/fuel screw on the side turned out 1.5 turn from all the way in

 

[yooper]

Yes, I have played with the air screw and it runs best at about 1-turn.

 

[yb200]

tell me more about your setup..main jet pipe filter ans so on....i dont think it would be the idle adjustment making it run bad

 

[yooper]

It's stock. I purchased from the original owner, who claims it has the factory tires. The engine has no evident of being removed or modified. There is evidence, stripped screw heads, that the previous owner did go into the carburator switch housing.