Engine Seized

[bam2002]

Hello group.
I just bought 2 Honda Superhawks. a 65 and 66.
The 66 is a cafe bike that has a fiberglass tank and seat-tail. It also is suppose to have a cam and head work done. The Cafe turns over but I have not tried to start since the electrical is all unhoooked.
The Red one is stock but missing the side covers.
However the engine is locked. I will be pulling the engine out and apart, my question is what locks up. Is it the piston- cylinders. Or do they stick at the crank case? The bike has been sitting since 1975.

[conbs]

For some reason these engines seem to draw moisture and lock up the pistons to the cylinders.

Before you pull the engine out of the red one, you may want to try to "unseize" it. Search this site. There are several different methods that guys have tried. 3 reasons. 1. It may not be that bad and if you get it free, it may run fine and you may not have to pull it apart. 2. Even if the cylinders are buggered up, if you get it free and ride it some, it may give you a bunch of clues about what you are looking for in the rebuild. 3. Even if you can't get it running after breaking it free, it will be a lot easier to disassemble.

Don't be so forceful that you break something else along the way. One man's opinion and others may advise otherwise.

[bam2002]

OK I have made a mix of carb cleaner, Liq wrench and ATF. But when I try to pour it down the spark plug holes it comes out of the exhaust holes.

So I lifted the front wheel about a foot off the ground to "level" the cylinders and that seemed to allow more fluid. Ill let it sit for a day or 2 and then see what happens. I read on another forum if you put the bike in 3rd and then sit on it and rock it forwards and backwards to break the engine loose.

If that doesnt work there always is a breaker bar on the crank nut on the shifter side.

[Solomoriah]

Any luck freeing those pistons? I have the same problem with my 1965 Dream; have tried carb cleaner, PB, and diesel fuel so far. Can't put much in without it running out the exhaust, which doesn't make sense to me as the exhaust valves shouldn't both be open at the same time, right? But you had the same result. Obviously I'm missing something here.