Stihl Bg55 will not do anything

[jhunsch]

Stihl Bg55 will not do anything.

I have two of these gas blowers that I will try to repair for a friend.
I have one running just fine.
The other wont do a thing, zero, it wont even try to start, not even a puff on starting fluid.

I switched the carbs between the two. The one that was running, runs fine with either carb.
The one that didn't run still does not run. At least I know I have two good carbs.
I clean the spark plug, and the baffle or spark arrestor. It also has 55 on a compression test.
Fresh fuel and new spark plug. Yes the spark plug has a nice blue spark.
Also checked that the prime bulb is pushing fuel. While pushing the primer bulb and holding
one finger in the tank I can feel fuel returning to the tank.

Any help will be greatly appreciated. What can it be. HELP?????

 

[gfp55]

Stihl Bg55 will not do anything.

I have two of these gas blowers that I will try to repair for a friend.
I have one running just fine.
The other wont do a thing, zero, it wont even try to start, not even a puff on starting fluid.

I switched the carbs between the two. The one that was running, runs fine with either carb.
The one that didn't run still does not run. At least I know I have two good carbs.
I clean the spark plug, and the baffle or spark arrestor. It also has 55 on a compression test.
Fresh fuel and new spark plug. Yes the spark plug has a nice blue spark.
Also checked that the prime bulb is pushing fuel. While pushing the primer bulb and holding
one finger in the tank I can feel fuel returning to the tank.

Any help will be greatly appreciated. What can it be. HELP?????

You said you switched carbs and both carbs work and you said the compression is 55. Is that the compression for the one that will not start? Did you check both for compression, are they the same? 55 seems low. If both are at 55, but only one starts then I would have to say that compression is not the problem. Maybe try switching the plug from the one that starts to the one that doesn't and see if that helps. Keep us updated

 

[Lawnboy18]

Also check the spark arrestor in the muffler. Unscrew it. Have an assitent hold it with a big pair of Vise Grips while you heat it with a torch and use a wire brush to brush off the carbon. A clogged arrestor can cause a non start situation. Also check that fuel is being sent and that the fuel filter is clean.

 

[exotion]

Also check the spark arrestor in the muffler. Unscrew it. Have an assitent hold it with a big pair of Vise Grips while you heat it with a torch and use a wire brush to brush off the carbon. A clogged arrestor can cause a non start situation. Also check that fuel is being sent and that the fuel filter is clean.

He said he cleaned spark arrestor.

I second compression seems low

 

[jhunsch]

Thank you to all that replied.

I check the compression on the other as advised an found it had compression of 105.

Next thing I did was tear down the one with no or only 55 compression.

It was really easy to take apart. I found the piston was scratched up pretty bad and both rings are broken.

New piston and rings on the way from E-Bay. $27.00 For $27 I will take a chance.

I cant see or feel any damage to the cylinder wall.

Most likely was run on straight gas. :thumbsup: