81 Yamaha XS 400 discussion forum:

RE: seized engine

RE: seized engine

TDUB said 2011-08-24 23:12

I know that if you put some atf (automatic transmission fluid) in the cylinders through the spark plug hole that will free a seized engine but not fully repair it it will get it running but the it will probably need rings and pistons. Marvel mystery oil and sea foam also work but I have had the beat luck with atf make sure u get all of the fluid out before u start it. Works best if you let it set for a day or two

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