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
We invite you to introduce yourself by a few sentences if you are new to
this discussion group. Enter your e-mail to join the forum and get notifcations on new messages. Or post your question,
answer or comment as a guest. We have just improved this discussion forum and expect the number of users to increase.
More 1981 Yamaha XS 400 information
Our discussion groups are intended for short messages. We also welcome more extensive motorcycle reviews.
Bikez also recommends that you check out the technical
data and the riders' rating for the 81 Yamaha XS 400.
You can also rate it yourself. Use our efficient motorcycle
classifieds to sell or
this bike. Your motorbike gets a high quality presentation. Ads are free.