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Compression test question - GS400

  • Thread starter Thread starter rhscanada
  • Start date Start date
R

rhscanada

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Does anyone know what the compression readings should be for a GS400?

I did a quick test last night and it was 90 psi - couldn't find the oil can so I will do the test with a squirt of oil tonight to see if I get a higher reading.
 
New, compression would be in the 145-170 range. If the engine has not been run for some time, the cylinders will be dry and the rings may be stuck a bit, so a compression check would not be accurate. I had the same situation with my 1100 when I got it. Compression was around 60 psi on all four. I sprayed a liberal amount of PB Blaster in each spark plug hole and let it sit for a couple days and rechecked the compression after turning the engine over a couple dozen times with a wrench. Compression was 140 all around. :-)

Earl

rhscanada said:
Does anyone know what the compression readings should be for a GS400?

I did a quick test last night and it was 90 psi - couldn't find the oil can so I will do the test with a squirt of oil tonight to see if I get a higher reading.
Click to expand...
 
earlfor said:
New, compression would be in the 145-170 range. If the engine has not been run for some time, the cylinders will be dry and the rings may be stuck a bit, so a compression check would not be accurate. I had the same situation with my 1100 when I got it. Compression was around 60 psi on all four. I sprayed a liberal amount of PB Blaster in each spark plug hole and let it sit for a couple days and rechecked the compression after turning the engine over a couple dozen times with a wrench. Compression was 140 all around. :-)

Earl
Click to expand...

Thank you for your reply Earl,

The bike has been sitting for 5 years before I purchased it a couple of weeks ago. You wouldn't believe the muck that was in the carbs.

I will get some PB Blaster and try that. Thanks for the info.

I will report back later.

Roger.
 
Make sure you hold your throttle open when you do the test as well.
 
Compression test failed

Compression test failed

Well I finally got around to performing the compression test properly (throttle fully open). The results were not good. Both cylinders would not go above 100psi even with oil in the cylinders.

I decided to take the plunge and yank the engine from the bike. I took it apart and found that there was about a 1 to 1.5mm gap between the piston and bore - the reason why I was getting low compression. The rings were not stuck. Looks as though I will have to do some reboring.

Does anyone know where I can mail-order oversize Suzuki pistons?

Roger
 
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