Stuck motor. For no apparent reason.

[FJmonkey]

Awesome, happy to hear you got it sorted out...

[dunc623b]

Almost 9 years on, but had to reply.

Thanks very much to  roverfj1200 for the solution, and scrapvalue for following up.

I was so sure this must be my issue I signed up to the forum last night optimistically. 

Rocked it back in gear just now, started first go.

Cheers all.

Dunc

[fj1289]

GREAT use of search tools!  And good follow up on a problem solved!   

Introduce yourself and your bike and enjoy

[red]

Scrapvalue,

I do not wish to alarm you, but you may have had a piece of metal stuck in the gears somehow.
It may be wise to drop the oil pan and look for any broken or stray metal in the pan.  A new oil pan gasket would be needed, there.
At a minimum, I would want to install a magnetic oil drain plug in the pan, to capture every atom of loose steel in the pan.  There are several makers of magnetic drain plugs; some are even drilled for safety (lock) wire, which I strongly recommend anyway.  The Internet can show you how to employ safety (lock) wire.  HTH.

[giantkiller]

I live in Wautoma Wisconsin and just picked up a 1985 FJ1100 2 days ago.

Nice clean bike with only 16,700 miles on it.

Hadn't been run in a year or so according to the owner.

I cleaned the carbs yesterday,(impressed on how easy it was to get them out), and got it running.

Put some sea foam in for good measure and road it a few miles.

I rode it again this morning and it ran and idled very well.

Parked it in the driveway for a few hours and went to go start it again.

This is where it gets weird.

Turned the switch on and hit the start button.  Turned over maybe a half of turn, sounded like it back fired lightly and would not turn over any further.

My first thought was that the petcock was not shutting off completely and filled a cylinder.

Took the plugs out and they were dry. Tried to turn it over and it was still stuck.

Thought maybe the starter locked up. Took t out and it is fine.  Motor would still not turn over by spinning the rear wheel. Still had the plugs out.

Pulled the valve cover off and everything is where it is suppose to be in there.

Pulled both covers of the sides of the motor,(at ends of crank shaft and again everything was o.k.

So I am very perplexed and not  very happy FJ owner at this moment.

Again, the bike was running fine when I shut it off. 

I live in Campbellsport WI. I would have rode over and helped. But I'm in Oklahoma helping my brother instal his solar.
I was going to say if gas leaks past the carburetor it'll fill the crank case.
But sounds like you've figured it out.
Enjoy the FJ, it's an awesome bike. An 86 fj1200 was my first bike back in 86. Have had many bikes since. Came back to fjs where I belong. I have 14 motorcycles 7 fjs, mostly future projects.