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Friends GS1000 motor toasted?

GabrielGoes

GabrielGoes

Forum Mentor
Hey guys a good friend of mine is beyond upset at this point the bike sounded like it was only running on 2 with no power, we went through the fuel, ignition/timing etc. and nothing, we did a compression check on cylinders 2-3 and they were way below with no compression, 1-4 were good @ a 1.25 i believe. White smoke pouring out the exhaust, oil all over on the muffler tip.. the bike has 25,000 miles roughly which is why i find it hard to believe the motors already toasted! you think its because he just ran it too hard all the time? is there any possbility that hte motor isnt toasted?
 
1.25 what?
What do the plugs look like?
Did this happen all of a sudden or over time?
 
Make sure the throttle is all the way open when checking and I would also check the valve clearances. So unless he ran it without oil Worst case it may need a new set of rings, or he may have burn't a piston if it wasn't properly jetted
 
SqDancerLynn1 said:
Make sure the throttle is all the way open when checking and I would also check the valve clearances. So unless he ran it without oil Worst case it may need a new set of rings, or he may have burn't a piston if it wasn't properly jetted
Click to expand...

check and check, there was oil in the bike as well. are the rings a hard job? we can do valve adjustments no problem i dont thing a ring repair

gearhead13 said:
1.25 what?
What do the plugs look like?
Did this happen all of a sudden or over time?
Click to expand...

i dont know i just heard the guy (bike shop owner whos a good friend) say a buck and a quarter. the plugs :eek:!! two of em were destroyed as in the tip/electrode whatever you wanna call it was GONE-non existant blown to smitherines. and the other two were snow white. we threw in new plugs hoping it would pass but still is no good! I believe it happened all of the sudden. We really thought it was ignition timing because it happened out of no where, its not, swapped all the parts on my 750 and it worked fine.
 
A compression test is completely meaningless without ensuring the valve clearances are correct first. Too tight and compression will read zero, even on a perfectly good engine. Hopefully he didn't run it hard with them way too tight until the valves burned up.
 
GabrielGoes said:
check and check, there was oil in the bike as well. are the rings a hard job? we can do valve adjustments no problem i dont thing a ring repair



i dont know i just heard the guy (bike shop owner whos a good friend) say a buck and a quarter. the plugs :eek:!! two of em were destroyed as in the tip/electrode whatever you wanna call it was GONE-non existant blown to smitherines. and the other two were snow white. we threw in new plugs hoping it would pass but still is no good! I believe it happened all of the sudden. We really thought it was ignition timing because it happened out of no where, its not, swapped all the parts on my 750 and it worked fine.
Click to expand...
Snow white plugs sound lean, piston maybe?
 
tkent02 said:
A compression test is completely meaningless without ensuring the valve clearances are correct first. Too tight and compression will read zero, even on a perfectly good engine. Hopefully he didn't run it hard with them way too tight until the valves burned up.
Click to expand...

hm that may be the case because i heard he rode like 30 miles with them running on 2. as far as the symptoms go they happened out of no where
 
snow white is EXTREMELY lean. there is surely internal damage of some sort.
 
bobthebiker88 said:
snow white is EXTREMELY lean. there is surely internal damage of some sort.
Click to expand...

Except that's the way they come from the factory, lean as can be, snow white plugs are normal on some of these bikes... Internal damage? maybe, maybe not.
 
GabrielGoes said:
makes me not want to beat on my bike now!
Click to expand...

Beat on it all you want once the maintenance is done and it's running correctly. These engines are bullet proof, however they are not idiot proof.

GabrielGoes said:
does anyone know of a compression chart that can fortell the future if your motors soon to be blown out?
Click to expand...

No chart, just adjust the valves and check the compression again, then ride it several hundred miles and do it again. The compression will come back up, unless the valves have been too badly burnt.

I have seen three neglected GS engines this summer, with zero or near zero valve clearance, and as a result, no compression on one or more cylinders. There can be no compression if the valves are not closing. If this is the case, the valves will start to burn, but if it's caught early enough, it may not be too serious.
After a valve adjustment these engines had some compression. After riding a thousand miles or so the compression got better and better. Will it ever get as good as the other cylinders? Maybe, maybe not, it depends on how much the valves were damaged. Two of these engines are still out riding around, several thousand miles on each. The other hasn't really been on the road yet for other reasons, but it's running fine, starts right up, idles smoothly, doesn't smoke.

In the future, it's a good idea to do these simple checks before ruining the engine. Much simpler to repair before there is too much damage.
 
Usually when you have plug like described and no compression means overheating and gulling on the pistons or maybe even holes in them. An old mechanic trick is to squirt some oil in sparkplug hole and recheck compression. If compression goes up then the rings are bad, if not it is valves, head gasket or a hole in piston. A leak down tester could help find the problem too. I can?t say what could have overheated the pistons but it is usually too lean, too hot plug or oil problem.
Could have bent a valve but that shouldn?t have caused the plug damage.
You will probably have to pull the head to be sure and do a top end.
 
Quit guessing. adjust the valves and go from there.

bent valves? I've had my '82 up around 11K rpms MANY times and have never bent one yet.
 
rustybronco said:
Quit guessing. adjust the valves and go from there.

bent valves? I've had my '82 up around 11K rpms MANY times and have never bent one yet.
Click to expand...

Ditto

I can go past 10K RPM, no problem in the lower gears

If it got hot enough to melt a piston, the exhaust should be gold, if not blue

Without knowing how this bike was maintained, we're kinda shooting in the dark here

Bad coil? switch the coil wire and see if it fires on the other cylinders

Wait - what year GS 1000? Does it have points?
 
we are going to assess the problem asap we are a little busy now, i told him about the valves and he should check asap, a friend tom who builds kawasaki racing bikes told us this : " On a leak down test you need a leakdown tester. You screw in the adaptor into the spark plug hole just like you do on a compression tester. Then you pressurize the cylinder at about 80 lbs. You have a guage that shows how much it's leaking and where. An example is you 0 the meter then you hook it up to the hose that goes into the sparkplug hole. You have the cylinder sealed up. That is both valves are closed.Then see how much is leaking and is it going past the valves or rings. An example would be you shouldn't have over 12% leaking for a respectable motor. Alot of my race motors were 2-5% which is great. Say you see the guage showes 50 -60%. If it has that much you could hear it coming out the exhaust if the exhaust valve was leaking. If the intake was leaking you could hear it coming out of the carborator. If it was past the rings you could take out the oil dipstick cap and hear it coming from the bottom end. Tom"

seems pretty interesing have any of you ever tried this method for testing?
 
Leakdown tester?
My bet there are holes in the pistons.
Pods? 4-1? running real lean and never rejetted and ran real hard?
 
GabrielGoes said:
the plugs :eek:!! two of em were destroyed as in the tip/electrode whatever you wanna call it was GONE-non existant blown to smitherines. and the other two were snow white. we threw in new plugs hoping it would pass but still is no good! I believe it happened all of the sudden. We really thought it was ignition timing because it happened out of no where, its not, swapped all the parts on my 750 and it worked fine.
Click to expand...
Two plugs destroyed, the same ones that have no compression?
Do you mean absolutely zero compression? Could be a burnt valve, but my bet is burnt piston.
Obviously running way lean and 2 and 3 run hotter than the outer two.
 
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