Started my Yamaha STX 340 today and it started after a boost of gasoline in the air filter.
The engine only runs on a cylinder. One spark plug was really good. White-brown color and dry. The other spark plug was black and wet.
So I swapped these two spark plugs. Now the engine runs well. It runs on two cylinders and I felt how quick the engine it was on the gas.
But as soon as I drive at low speed, I feel that that the engine begins miss to spark the other spark plug. It is always the left spark plug that turns black and wet. I don't know why. It's only one carburetor on that engine.
So to avoid this problem, I always have drive fast with my Yamaha so all spark plugs will "burn out" the gas.
I have screwed down the low speed pilot screw in the bottom. The needle of carburetor is at the bottom position and the idle screw is screwed in a lot but not completely. So the setup of the carburetor is poor because one spark plug becomes always black and wet at low speed.
The light spark on both spark plugs is very good and the STX always starts. But if the STX haven't started for a year, it need a boost of gasoline to start.
Question:
Is this behavior normal for a 41 year old snow mobile from 1977? Should I accept this?
The carburetor look like this:
http://ift.tt/2zR17bf
The similar model of my Yamaha STX 340 1977 is Yamaha Exciter 340 1977. Mine look like this:
The engine only runs on a cylinder. One spark plug was really good. White-brown color and dry. The other spark plug was black and wet.
So I swapped these two spark plugs. Now the engine runs well. It runs on two cylinders and I felt how quick the engine it was on the gas.
But as soon as I drive at low speed, I feel that that the engine begins miss to spark the other spark plug. It is always the left spark plug that turns black and wet. I don't know why. It's only one carburetor on that engine.
So to avoid this problem, I always have drive fast with my Yamaha so all spark plugs will "burn out" the gas.
I have screwed down the low speed pilot screw in the bottom. The needle of carburetor is at the bottom position and the idle screw is screwed in a lot but not completely. So the setup of the carburetor is poor because one spark plug becomes always black and wet at low speed.
The light spark on both spark plugs is very good and the STX always starts. But if the STX haven't started for a year, it need a boost of gasoline to start.
Question:
Is this behavior normal for a 41 year old snow mobile from 1977? Should I accept this?
The carburetor look like this:
http://ift.tt/2zR17bf
The similar model of my Yamaha STX 340 1977 is Yamaha Exciter 340 1977. Mine look like this:
One spark plug is black but the other spark plug is white-brown - Why?
0 commentaires:
Enregistrer un commentaire