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Honda CB750/900/1100F SuperSport Website: SuperSport Forums |
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super
Hawk
Joined: Jul 21, 2015
Posts: 509
Location: Norway
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Posted:
Sat Sep 16, 2017 11:55 am |
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I took a compression test today but I didn't take out all of the sparkplugs. Just the one on the cylinder i measured, then I put the sparkplug back in and measured another and so on. Would this give me a false reading? Should I do it once more with all the plugs out simultaneously?
The bike was warm and I had it at full throttle when measuring.
The test gave me the numbers one to fourth carb: 151, 150, 150, 151 - Sound good?
Any comment or suggestion is welcome. |
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fr8train
Twinstar
Joined: Aug 03, 2010
Posts: 258
Location: se pa
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Posted:
Sat Sep 16, 2017 12:45 pm |
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Remove all spark plugs. Be sure to hold carbs wide open, no choke. Check all 4 this way & write numbers down. Can add some WD40 & retest. If compression comes up quite a bit, bad rings. If just a little, bad valves. Valves are more of a problem than rings on these motors. Spin mtr several times to let compression build. |
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sillygoose
CB1100F
Joined: Oct 18, 2012
Posts: 2567
Location: Skaneateles, NY
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Posted:
Sat Sep 16, 2017 12:59 pm |
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super wrote: |
The test gave me the numbers one to fourth carb: 151, 150, 150, 151 - Sound good? |
I think you're fine but next time remove all the plugs so it makes it easier to spin the engine. The spec is 170 +- 28 so you're in spec and you don't have any outliers. |
_________________ 1983 CB1100F
1981 CB985F |
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super
Hawk
Joined: Jul 21, 2015
Posts: 509
Location: Norway
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Posted:
Sat Sep 16, 2017 1:01 pm |
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fr8train wrote: |
Remove all spark plugs. Be sure to hold carbs wide open, no choke. Check all 4 this way & write numbers down. Can add some WD40 & retest. If compression comes up quite a bit, bad rings. If just a little, bad valves. Valves are more of a problem than rings on these motors. Spin mtr several times to let compression build. |
Yeah i just did that now, after checking out the manual
So now i get compression from one to fourth carb: 152.5, 152, 125, 152,5
What do you mean add some WD40? |
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Luckysox
CB1100F
Joined: May 13, 2005
Posts: 3249
Location: NE OHIO
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Posted:
Sat Sep 16, 2017 1:11 pm |
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Is #3 a typo ?? Went from 150 down to 125 |
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super
Hawk
Joined: Jul 21, 2015
Posts: 509
Location: Norway
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Posted:
Sat Sep 16, 2017 1:15 pm |
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No thats what I got. Obviously out of the ordinary it sounds like but is it extra-ordinary? |
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super
Hawk
Joined: Jul 21, 2015
Posts: 509
Location: Norway
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Posted:
Sat Sep 16, 2017 3:02 pm |
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I'll try it out again tomorrow. Maybe I forgot the open throttle on the third cylinder. |
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