compresion values for gsx110 16 valves

[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

[Nessism]

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?

[Big T]

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

[fastbysuzuki]

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

yes I second the use of Robinsons great service you may get a better deal if you look at https://www.discountbikespares.co.uk/. Also good service.

[bobgroger]

You checked with the throttle wide open? closed will really affect the numbers

[Jzape2005]

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?[ATTACH=CONFIG]57316[/ATTACATT

[Jzape2005]

another photo of the valvesIMG_20190216_210004.jpg

[fastbysuzuki]

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.

[Jzape2005]

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.

[Jzape2005]

My suzukiIMG_20190207_164313.jpg

[fastbysuzuki]

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.

[Nessism]

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.

Don't think they make 4V 1100 pistons.

[Jzape2005]

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?

[Nessism]

Would it be possible to put suzuki pistons 250 gn?

Pistons or rings? As near as I can tell the rings are the same between the GN250 and the 1100E but please check for yourself...https://www.partzilla.com/product/su...5701578f8e1ffb

[Jzape2005]

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