1978 xs400 motor issue

Jared salsano

Jared salsano

XS400 Enthusiast
Messages
34
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10
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Location
New Jersey
Hey, new to the xs world and new to the forum. I just picked a 1978 xs400. It's been sitting for a long time and the motor was locked up so I started pulling it apart to see what I could find. I put some marvel in the cylinders and let it sit. Pulled the side cover and put a wrench on the crank and I got it moving(kinda). It will only turn about a quarter or half a turn and then stops, it does this if I turn it in either direction. It moves very easily now, I can turn it by a hand. Any ideas? Thanks in advance
 
Myron said:
There is a pdf of a Haynes manual in the tech section of this forum. page 25ish.
Click to expand...
Turns out the right cylinder was so rusted that the piston wouldn't move past it. Ordered jugs and a head because the valves and head were pretty well corroded too
 
Myron said:
I usually work on car engines, and on a car I would have it bored out and buy an oversize piston. Maybe they don't do that with bikes?
Click to expand...
You can but with the 400 it's harder to find oversized pistons, and the one kit I found is 300 just for the pistons
 

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