426 won't start anymore and backfires

Change your spark plug!!!!!!!!!!!!!!!!!! Then I guarantee you it will crank.:thumbsup:

can anyone tell me what size the plug wrench is for the 426 as i have a funny job getting it out with the tools i have.

They're 16mm, or 5/8". What works best is a socket with a swivel extension permanently attached to it. Motion Pro makes a socket extension combo that works nicely, too.

thx grey i got hold of the motion pro socket 5/8 from ebay,i looked on thumper talk but the postage is to deer to ship to uk. I got it for £13 from ebay.

thx

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