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maybe a stupid question, but I have three different sizes at home an none seem to fit. Since i prefer not to keep buying spark plug sockets till I hit on the right one, I was hoping one of you folks would be able to help.

thank you.

I have a 5/8, 3/4, 13/16, and 18 mm to fit everything I come across.

3/4 if it has the correct plug. If not I'd try 5/8. Those are the only two sizes I've ever seen on a Husqvarna 128.

Look INSIDE your plug sockets, sometime the rubber plug grip gets turned sideways and prevents the socket from going down onto the plug, if it's crooked, straighten it up..

I'll check on the sizes I have when I get home. It's the original plug.

thanks.

lma said:

I'll check on the sizes I have when I get home. It's the original plug.

thanks.

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It's 3/4 then.

3/4" is a 19mm