1985 Honda Goldwing 1200 Aspencade Stuck Pistons

Information and questions on GL1200 Goldwings (1984-1987)
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Motorcycle: 1986 Honda GL1200 Aspencade

1985 Honda Goldwing 1200 Aspencade Stuck Pistons

Post by revperry1957a »

I bought a used wing and rain has gotten inside the engine and the pistons are rusted tight to the cylinders. So I pulled the heads after soaking them with marvel mystery oil and ATF. I have taken a block of wood and went round and round the pistons but still no movement. The previous owner ruined the front of the crankshaft with a pipe wrench and still no movement. I have ordered cases and a used crank and pistons. My question is how am I going to split the cases to change everything out into the new cases and what should I check for one I get inside? I am new to the wings but always wanted one and hope to get her restored.

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Re: 1985 Honda Goldwing 1200 Aspencade Stuck Pistons

Post by virgilmobile »

OK.let's review...you have a case coming...no innards.
You have pistons coming as well as another crank.
You are going to salvage the rest of the innards of your engine to build another.

Your problem is that the pistons are stuck tight in your block and not being able to free them you cannot split the case.

Right so far.???

The pistons on the left side must be freed to get the case to move.

What would I do.??
Short of beating the juice out of the pistons I'd probably spend 3 more days at it.
This time use a 50/50 mix of ATF and acetone on each side standing up right for a day
It soaks in better.
As a last resort,you may also try a bit of muratic acid.The stuff that dissolves rust.

Try not to beat on the pistons too hard.Don't want to damage the rod bearings should one free up.

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Re: 1985 Honda Goldwing 1200 Aspencade Stuck Pistons

Post by pixel288 »

Toss the old heads back on with the head gaskets. Don't bother with the push rods, just leave the springs in place to hold the cylinder closed. Go to a hydraulic supply place with an old spark plug, or maybe a harbor freight and get a grease gun hose made up with the plug thread adaptor. Get some cheap grease tubes, and make sure the valves are closed on the cylinder you want to fill. Pump the cylinder full of grease and once you start feeling resistance, pump slowly and carefully till the pistons start to move. A grease gun can produce up to 10,000 psi, so it should start to move.


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Re: 1985 Honda Goldwing 1200 Aspencade Stuck Pistons

Post by twocams »

And my question is why didnt you just get a good used engine. Chances are your cam bearings are shot too. Your cylinders will need honing. But good chances they will need to be bored to the next piston size. :shock:


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