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Old 04-11-2009, 06:21 PM   #1
crofrog OP
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Compression test results (how do my numbers look)

So new to me 950 Adventure tested compression on a cold motor last night.

220psi front / 215 rear.

I've got allot more wrenching time on cars than bikes and that sounds like a good number, is it?
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Old 04-11-2009, 06:47 PM   #2
Hammer
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That's fine.
Doing cars, you must know those are big #'s.
This is a high compression race style engine.
Spank that bad boy!
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Old 05-23-2009, 08:43 PM   #3
NeverQuit
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Did anyone ever come up with the "listed" numbers? My '04 950 just compressed 236 in the front, and 240 in the rear.

Seems to be a huge variance in what folks are reporting. I hope it's not our gauges.....
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Old 05-24-2009, 03:28 AM   #4
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Quote:
Originally Posted by NeverQuit
Did anyone ever come up with the "listed" numbers? My '04 950 just compressed 236 in the front, and 240 in the rear.

Seems to be a huge variance in what folks are reporting. I hope it's not our gauges.....

It wouldn't surprise me though. I'm sure the tempature of the motor has something to do with it too. My valves where "loose" also.
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Old 05-24-2009, 07:54 AM   #5
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Quote:
Originally Posted by crofrog
It wouldn't surprise me though. I'm sure the tempature of the motor has something to do with it too. My valves where "loose" also.
Looks like both of our motors were cold when we checked. Huge variance there somehow...
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Old 05-24-2009, 07:55 AM   #6
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Quote:
Originally Posted by crofrog
It wouldn't surprise me though. I'm sure the tempature of the motor has something to do with it too. My valves where "loose" also.
Looks like both of our motors were cold when we checked. Huge variance there somehow...
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Old 04-13-2010, 12:14 PM   #7
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I think I failed at the valve check last time. Just reset the valves after a year or riding and of course did another compression test:

Front: 235psi
Rear: 240psi

Checked cold with the same gauge.
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Old 04-14-2010, 09:07 AM   #8
charlie264
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240psi is a lot, that’s 16.5 bar. Never checked mine but the manual states 11.5/1. My compression tester was about 20 quid 20 years ago, a pro tester that reads high and low pressure is not the same as a cheap tester that has a bourdon tube and a one way valve.

Having said that, I would say anything over 8 bar turned over by the starter motor is acceptable.
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Old 04-14-2010, 10:30 AM   #9
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compression test can't really be used to gauge condition of the engine.

I use comp numbers (psi) to see if all cylinders are with a percentage of each other. that's about it.

get a leak down tester/compressed air and do a leak down test. mine tested at 5% at the last valve adjustment.
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