Topic: found a parts bike

[bikeme2001]

I found a 78 750 f,I have a 78 750 f I'm restoring.The motor in the parts bike is frozen and when I drained the engine oil it looked a clear substance similer to water.I'm just wondering if the motor is worth pulling apart or do I just scrap the thing.I don't want to spend a bunch of time to find out its all junk.I did strip the frame and paint.Ill use the frame on a cafe bike later.And I did get a bunch of plastic and both wheels, forks, front and rear brake rotors and complete rear brake system.I need all this stuff for my restore project.Any hope for the motor?

[KB02]

I turned a frozen motor into a runner, so it can be done. If you don't need it right now (planning on using the other motor you have), I say pout it aside and tear it down later. Might be some useful bits in there that you can sell o ebay or maybe make a built up motor once you have the bike running with the stocker.

[the architect]

A friend of mine freed up a siezed motor by pulling the head and filling the cylinders with some amount of diesel fuel.  Over about a week's time, it penetrated the areas that were fused and the thing ran. 

Clear oil.  Reminds me of that clear Crystal Pepsi, from back in the day.   

[bikeme2001]

Yea, the thing was full of water,

[mgbgt89]

Acetone and ATF mixed in a 50/50 solution will free a stuck engine, or so i've heard. It supossedly is better than any off the shelf rust penetrant.

[MCRider]

Acetone and ATF mixed in a 50/50 solution will free a stuck engine, or so i've heard. It supossedly is better than any off the shelf rust penetrant.

There is an engineering type report on the forum somewhere that confirms this. I'd mix some up, squirt it down each plug hole wait a day and see.

In any event, I wouldn't "scrap" it, sounds so final. Someone is interested in a whole motor seized or not. The alternator is valuable, if low mileage the trans is valuable, etc. Even people need whole cases sometimes when theirs are broken.

Being a dry sump motor one wouldn't expect much oil in it. The water could have come from condensation which is generally what rusts them up any way, just sitting around. In a cold shed outdoors or such, temp changes causes condensation.

Not necessarily or even probably malicious abuse.

[bikeme2001]

I have soaked the engine with fluid film,I will get some acetone and AFT later.I'm hooked on these bikes though.Seems cool to be able to get a bike for next to nothing and find all kinds of pieces that you need and to be able to start an other project along the way.

[kerryb]

I got a parts bike with what seemed like a seized motor ('78k).  During disassembly, I found it would spin backwards and forward through about 340 degrees.  The problem was rust right at the top of a cylinder so it couldn't go through top dead center.  You may have more possibilities than you think.