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Honda CB750/900/1100F SuperSport Website: SuperSport Forums


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super
Hawk
Hawk



Joined: Jul 21, 2015
Posts: 511
Location: Norway

PostPosted: Sat Sep 16, 2017 11:55 am Reply with quote Back to top

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
Twinstar



Joined: Aug 03, 2010
Posts: 261
Location: se pa

PostPosted: Sat Sep 16, 2017 12:45 pm Reply with quote Back to top

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
CB1100F



Joined: Oct 18, 2012
Posts: 2555
Location: Skaneateles, NY

PostPosted: Sat Sep 16, 2017 12:59 pm Reply with quote Back to top

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.

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super
Hawk
Hawk



Joined: Jul 21, 2015
Posts: 511
Location: Norway

PostPosted: Sat Sep 16, 2017 1:01 pm Reply with quote Back to top

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 Twisted Evil

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
CB1100F



Joined: May 13, 2005
Posts: 3288
Location: NE OHIO

PostPosted: Sat Sep 16, 2017 1:11 pm Reply with quote Back to top

Is #3 a typo ?? Went from 150 down to 125
 
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super
Hawk
Hawk



Joined: Jul 21, 2015
Posts: 511
Location: Norway

PostPosted: Sat Sep 16, 2017 1:15 pm Reply with quote Back to top

No thats what I got. Obviously out of the ordinary it sounds like but is it extra-ordinary?
 
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super
Hawk
Hawk



Joined: Jul 21, 2015
Posts: 511
Location: Norway

PostPosted: Sat Sep 16, 2017 3:02 pm Reply with quote Back to top

I'll try it out again tomorrow. Maybe I forgot the open throttle on the third cylinder.
 
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