Freeing stuck piston in WB820

[DeanRichards]

Good afternoon,
      
    I picked up a couple Chrysler/WB ultra lite motors the other day and one of the pistons seems to be stuck/froze up in the cylinder. What would be the best option on trying to get it freed up? I have been soaking it with WD but it doesn't want to break loose. Just don't want to be hammering on any parts. Appreciate any help. Thanks.

[Terry Bentley]

That engine has a chrome bore. Common back in the olden days to run castor. If there is a yellowish tint to the film on parts, you may have luck with lacquer thinner or acetone to help break up the dried residue.

[DeanRichards]

That engine has a chrome bore. Common back in the olden days to run castor. If there is a yellowish tint to the film on parts, you may have luck with lacquer thinner or acetone to help break up the dried residue.

 Thanks Terry, I will check the color of the gunk and try the lacquer thinner/ acetone trick. I appreciate your reply.

[Frank Payne]

Try kroil it’s worked wonders for me