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1983 gs 850 suzuki compression test

  • Thread starter Thread starter RonP44
  • Start date Start date
R

RonP44

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I ran a compression test while the bike was cold

#1 cyl - 111
#2 - 109
#3 - 105
#4 - 105

The engine hasn't been run in a while (14 years) and i plan on running the test today after the bike has been warmed up.
I don't have any idea where the numbers should be so i was hoping somebody might be able to help.
 
Retest with warm engine and holding throttle wide open. Your numbers are consistent which is a good sign. You might want to verify valve clearances first for obvious reasons.

General rule of thumb is 150psi = excellent, 125 = okay, 100 and below = not good.
 
thanks

thanks

I thought 150 was a good target but wasn't sure. I will run it later.
 
here's the deal

here's the deal

AFTER A 2 MINUTE WARM UP I RAN ANOTHER TEST

#1- 121
#2- 111
#3- 120
#4- 120

This bike sat a long time so i am happy to have these numbers.. i will have the valves checked soon because i dont think they had been adjusted in a while. this may help get the numbers up too...Thanks for your time.
 
I have 125 lb across all 4 on my 79 850 it runs great. With those #s I would not worry & just work on other problems
 
this bike sat for 14 years in a shop and collected dust. i was excited about getting it started. i have a huge list of restoration projects but just to get it running is HUGE!!!! thanks for the info.....the engine sounds good but still battling the carbs.
 
I bought two bikes that spent a LONG time in storage - 20+ years for one of them. I didn't even try to get the bike running until I completely rebuilt the carbs, replacing all the various O-rings, the intake pipe O-rings, air filter, valve adjust, etc. Saves a ton of time in the end to just take care of business on the front end...
 
yes yes yes

yes yes yes

i used the carb rebuild guide. i have a huge list of things i need for this resto but i wanted to see if it would run before i spent anymore cash on it.:-|
 
The compression #s are good. Now concentrate on electrical and carbs.
 
The numbers seem fine. Sort the rest of it out as you need to.

Suzuki mad
 
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