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Compression #'s ?

  • Thread starter Thread starter GSDCW
  • Start date Start date
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GSDCW

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Looking at purchasing an 83' GS1100E with around 27,000 miles. What should I look for in good compression #'s ?
 
Get your numbers on a warm engine, if possible, be sure to hold the throttle wide open while checking.

Actual numbers can be interesting, but consistency across the four is just as important.

.
 
Prior owner measured all cylinders for compression. All were even at 150 +

Purchased Bike :)
 

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That's why I can't help smiling looking at my 11E. The gods were smiling on me when I bought her.:o
 
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After. I purchased my 11E (running nicely) and then got it running even better, I asked my mechanic if we should check compression.

He said, "No. It runs great, you love it, right? Knowing compression could only cause you heartache."

I like that. I'm not even going to check the air in the tires any more! :p
 
After. I purchased my 11E (running nicely) and then got it running even better, I asked my mechanic if we should check compression.

He said, "No. It runs great, you love it, right? Knowing compression could only cause you heartache."

I like that. I'm not even going to check the air in the tires any more! :p

I like that mechanic.

If it runs great, you love it, and don't have the funds/time/energy to address any compression issues, then I would agree with him. Don't check it and enjoy the bike.

If you have the funds/time/energy, then by all means, check it.

I know the checking tire air pressure was a joke, but not checking tire air pressure can get you killed or seriously injured, whereas not checking compression won't do that. :)
 
Right you are. Checked, then added a few lbs front and rear before a 100 mile day today. Couldn't do the real 'buck' , though 'cause I was riding with little brother and wanted to keep an eye on him.
 
Just got my bike back from the shop. 150 # in all but one piston, that show 110 #s. Bike is running well, so I wonder if the test was off.
 
Hey Rob, glad to hear you're feeli'n better? 100 mi. day, did you find a sidecar? or just heal quick? GSDCW, I've always wanted an "83" black eng. with the "82" Champagne colored body work. To me looks way better than the "83" bright red or drab blue W/ black eng. or the "82" champagne or maroon W/ silver eng. Congrats.
 
Hey Rob, glad to hear you're feeli'n better? 100 mi. day, did you find a sidecar? or just heal quick?

Check the dates. Last April I rode with little brother on our Hardleys. This April I spent in a nursing home learning to walk again. :( :(
 
Man, talk about your zombie threads! 100mi in a sidecar is painful enough without pelvic surgery!! Prayers daily for you, Rob. Tougher than nails, but that's only what NY breeds, right?? Godspeed, brother.

As for the compression test, yeah...compression gauges are a must have for any rider's toolbox. Just make it a quality analog device & you'll pass it on to your great great grandchildren ') Digitals need batteries, and they can give false reads if the battery goes weak. And who's to say the batteries will be available when your grandkids claim it from you lol?
 
Just pok'in at you Rob, I knew there was something else there, just didn't know what the heck it was. Why would anyone look at the dates?, they don't mean anything anyway, or do they. Meant nothi'n by it. How bou't a progress report?
 
All cylinders with numbers only 4psi difference is fine. Standard is 10% difference
 
Just wondering that with CV carbs by just opening the throttle plates all the way won't the slides still be some what of a restriction,causing lower #'s
 
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