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Old 04-15-2017, 07:44 AM   #1
cbr900rr
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Default Compression test

So I did my first compression test,...got horrible numbers.
For #1- 90, #2 -65, #3 -60, #4- 60.
I held down the starter for 5 seconds per service manual,
I removed all spark plugs per the manual,
I used a compression gauge from harbour freight using the 10m.m. adapter
I removed the whole pair air system for more workspace,
I'm guessing that should have nothing to do with the compression in the cylnder?
Cold start...The bike Sat overnight before I tested it in the
....mf....i didn't do w.o.t.....
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Old 04-15-2017, 08:16 AM   #2
cbr900rr
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Default Re: Compression test

Well. W.o.t. didn't do me to much luck.
#1- 90 #2- 87 #3- 85 #4- 85..
The bike has 60,000 miles.
I'm doing all this because I need to see what these valves look like. I've put about 20,000 on the bike, still runs great minus the c.c.t. I get a little more than "average" noise from it. Sounds pretty harsh wants my bike gets yo about100, slowly stops after about 10 min...just starting to sound a little to rough for me.
There's a shit ton of oil in my airbox. Also smelled like gas for the first time since I last cracked open the air box/filter.
Might try a different adapter? I feel like it was pretty snug but it is a harbour freight item? Idk.
The airbox, carbs are still on,
I completely removed both coils.
Battery had a nice charge..
Kind just stumped at the moment
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Old 04-15-2017, 08:18 AM   #3
cbr900rr
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Default Re: Compression test

"Once"
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Old 06-12-2017, 10:49 AM   #4
sebi1990
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Default Re: Compression test

I don't think you should remove all the sprak plugs at the same time
Also how much do you trust that HF compression tester?
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Old 06-12-2017, 11:22 AM   #5
Sundog
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Default Re: Compression test

The noise from the cct isn't too unusual with those miles. The automatic cam chain tensioner is known to wear out. Mine did. You can order a replacement and probably fix that issue -- either another OEM automatic or an aftermarket manual tensioner.

http://honda599.com/forums/showthread.php?t=8294

As for oil in the airbox, I've had that too. Never did figure out if it was a serious symptom of a problem, but I've ignored it for years without trouble.

Removing all the plugs and leaving them open seems to be the correct way to do it according to the manual.

Since spec is 188 psi, I have a hard time believing that your gauge is reading correctly. Does it use an o-ring to seal? A little bit of internet research says the bike shouldn't even be running at all with those sub-100 psi numbers.
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