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compresion values for gsx110 16 valves

  • Thread starter Thread starter Jzape2005
  • Start date Start date
J

Jzape2005

Guest
Hello, i'm an old user of this forum,
I was enjoying my bike until this week. suddenly the 3th and 4th cylinder have stoped working, I checked the copresion and the results are : 1st 100psi/2nd 80psi/3th 80/4th 100psi. The questionis which is the right values of this engine?

The model is Suzuki GS1100; 16 valves year 1981.
I'm almost sure thath this engine is almost  in terminal fase, ife someone knows the original compresion values please tell me to try with the originals.

Ife the values are wrong I will repair them, Ife someone knows somewere to buy spare parts please contact with me.

I live in Catalonia, Spain

Thanks and greetings

Sorry ife i'm in a wrong forum department ;)
 
Last edited:
Approximately 150+ psi is where the pressure should be. Below 120 and you are approaching the danger zone.

How long since you last adjusted the valves?
 
Valve adjustment most likely

If valves haven't been adjusted in many miles, valve job may be required.

I think most Europeans use Robinson's in the UK for parts
 
Hi, thanks for the answers.
I checked the slack of the valves, they are in acceptable values, as the engine has not improved, I decided to disassemble the cylinder head to see how the valves were, the result is that the pistons n ? 1, 2,3 are clean, the ? 2 is the head of the piston very dirty.
the valves of the cylinders 1 and 2 seem to be fine, but those of the cylinders 3 and 4 are totally black.
The doubt that I have is that the oil does not pass through the check valve and that's why it does not work properly.
As the engine is already open, I do not know if it would be better to finish repairing everything, valves and pistons, any advice?View attachment 57316
 

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This looks like it's going to be an expensive repair given you have checked the valve clearances and said they are acceptable and taking the compression readings you have reported (you did this with a warm engine with the throttle held wide open?) it looks like the bores and Pistons are shot through. You mention that there may be a problem with oil flow through the check valve that needs to be resolved before you go any further.
you really need to take the cylinders / Pistons to someone that has the correct measuring equipment unless when you
take them off the damage is obvious.
i must warn you that using Oem gaskets is recommended,in Europe they are expensive if you intend to get this engine up to scratch carefully check the cost of everything before starting.
 
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Canvia a espanyolHello, thank you for your interest and time.
After checking the compression several times, with a hot engine and carburetor opening, the compression measurements did not change, I decided to disassemble to see how the interior of the engine was.
As I mentioned, cylinders 1,3,4 came out clean, 2 very dirty. the strange thing was that precisely the cylinder 2 if it worked, the exhaust pipe was hot, but the cylinders 3 and 4 the exhaust pipes were almost cold.
Check the spark plugs and the ignition, all correct.
Today I will start cleaning valves and I will change the valve guides, it is an expensive repair, but I love this bike, with time and without hurry I hope to repair it and enjoy it again.
I have looked at the wiseco pistons, it seems that they are almost the only ones for this engine, if anyone knows of other piston models for this engine I would be grateful.
He tells me that the meetings have to be original. Here in Spain there is nothing, only in Germany, and I do not think they are original.
greetings to all.
 
It may be worthwhile having a look at cruzinimage for Pistons Here they are in Japan I think the parts are made in Taiwan
some on have used them and reported no problems.
Bear in mind any custom duty that would be payable.
 
fastbysuzuki said:
It may be worthwhile having a look at cruzinimage for Pistons Here they are in Japan I think the parts are made in Taiwan
some on have used them and reported no problems.
Bear in mind any custom duty that would be payable.
Click to expand...

Don't think they make 4V 1100 pistons.
 
Hello again.
In the end I decided to go over the engine, cylinder head and cylinders.
The mechanical workshop reviewed valves, seats and planed the cylinder head, carbon cleaning, polished intake nozzles, almost as new has been.
Now lack cylinders, the mechanic says that with a review and new piston rings, it will be fine, the margin of wear is correct.
But I have a question.
The piston rings of the suzuki gn 250 are of the same size, and it seems that the piston also, 72 mm.
I'm missing information on the piston size of the suzuki gn 250. 72 mm wide. but I do not know how high it is.
Does anyone know something?
Would it be possible to put suzuki pistons 250 gn?
 
thanks for the reply.
If the piston rings are of the same size, suzuki gn 250 and suzuki gs 1100.
I do not have a piston of suzuki gn 250, so I ask if someone from the forum knows the measurements, it's a pity to buy one and then it does not work.
greetings to all
 
Jzape2005 said:
thanks for the reply.
If the piston rings are of the same size, suzuki gn 250 and suzuki gs 1100.
I do not have a piston of suzuki gn 250, so I ask if someone from the forum knows the measurements, it's a pity to buy one and then it does not work.
greetings to all
Click to expand...

Check the part numbers. Same part number = same parts.
 
Hello again.
In the end I decided and completely repaired the engine, taking advantage of it, I removed the rest of the bike and painted the chassis, to see without this week is ready and I start to ride.
The cylinders had a correct wear. I took them to the workshop to be reviewed and reviewed inside, with some new rings I think it would be fine.
 
In case you are not aware...OEM Suzuki gaskets are the best. Athena brand (green gaskets) are the worst. Other brands are in between.
 
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