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GS1000 head removal

  • Thread starter Thread starter Guest
  • Start date Start date
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Guest

Guest
Hey guys, is there enough clearance to remove the head on a 78 GS1000 with the motor still in the frame? All attempts to get cylinder 3 firing have failed, so I'm down to it must be mechanical.
 
145lbs. Gas, spark, 2 thousands clearance on all valves. Makes no sense to me, so I guess the next step is pulling the head. I even swapped the intake boots around and sprayed ether everywhere. Can't think of any other diagnostics to try.
 
With good compression, what will you be looking for when the head is off?... I'm missing something and can't remember what it is.
 
The only thing I can think of is some kind of physical damage...bent valve, cracked head? But then, wouldn't the compression be down if that were the case?
 
If there was physical damage, the compression would be off. It's possible that something's plugged up the header pipe, but that's unlikely, because the muffler is shared.

Most likely, either a carb problem or the plug isn't firing.
 
Can't be either of those. In the original post I said there has been different plugs, carbs, and coils on that cylinder with the same result.
 
"IF" you have fuel, spark and compression, "AND" they happen, when they are suppossed to happen, you should have combustion! Are you positive that both valves are opening? If the intake valve is not opening, you won't get fuel to that cylinder and no combustion happens!

Have you tried putting fuel directly into the spark plug hole and see if it fires?
 
If the valve isn't opening wouldn't that affect the compression? I have tried gas in the plug hole yet. I can try that before I pull the head.
 
We have some strange ideas out here in the country. How about quirt some starting fluid into the vacuum access port on that carb. with one of those little plastic straws that comes on some cans of starting fluid?
 
That's an interesting idea I never thought of, think I'll try that, thanks!
 
How about switching the coils? Move 1-4 to 2-3 and see if the problem with number 3 cylinder continues?
 
Like I said in the original post I've already swapped in another set of coils with no effect.
 
Still trying to figure what you may be able to see or be looking for after the head is removed?
 
Yes. I have no idea what else to test before pulling the head. If u read the original post, I have tested everything else.
 
Remove all the plugs and stick a probe camera down the spark plug hole and have someone turn the engine over, you should be able to see if there's a problem by doing that.

If you don't have one already they are quite reasonable to buy and you will find other uses for them once you have one.

https://www.amazon.com/dp/B0BGHX8PP3...T1zcF9kZXRhaWw
 
Last edited:
Another good idea and a lot less work...Thanks! Thanks for all the suggestions guys, I really appreciate the input.
 
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