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Update...tried again to rotate the motor by hand and the bolt snapped off in the engine. Needless to say, not off to a good start. Is it expensive to take the engine to a shop and have them redo it? I was hoping to haven it running this fall, but it may become a winter project.

The threads look good, but the head of the bolt has some serious wear. Looks like someone was cranking on her.

I also put in 'Penetrating Oil' not

Sounds good. I'm a little worried that 17mm bolt is stripped. Any ideas where I can get a new one?

Ok, So I pulled the plugs out and put some penetrating oil in the cylinders. I let this sit for a day. Then I pulled the cover off and rotated the motor by hand. When I spun the bolt counter clockwise, it just un-threaded. I also tried kicking it over and it was still firmly seized. Any...

Any idea where I can get a replacement?

Awesome! Thank you so much for the information. I will try those things tonight and get back to you. Good eye on the sheered bolt!

1980 XS400 Hey, I just bought a 1980 XS400