Compression test

**Fri Oct 05, 2007 1:55 am » Post: #1 » Download Post**

Could I please get a compression number for an NSR? My bike has 7K on it...I am going to check it soon...could I get a high and low range? Thanks...

Michael
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'93 MC21 250sp Repsol "Doohan"

**Fri Oct 05, 2007 12:51 pm » Post: #2 » Download Post**

MC28 Cylinder head compression pressure 10.0 kg/cm2/400RPM

**Fri Oct 05, 2007 2:58 pm » Post: #3 » Download Post**

Thanks! any chance you can convert that to lbs? Or do most gauges read both? Thanks-

Mj
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'93 MC21 250sp Repsol "Doohan"

**Fri Oct 05, 2007 3:45 pm » Post: #4 » Download Post**

http://www.onlineconversion.com/pressure.htm
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**Fri Oct 05, 2007 7:46 pm » Post: #5 » Download Post**

10 kilogram-force/square centimeter = 142.233 433 343 pound/square inch

Is this correct ? How do you do a compression test at 4000 RPM's ?

**Fri Oct 05, 2007 7:54 pm » Post: #6 » Download Post**

I think you will find he said 400 rpm
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**Fri Oct 05, 2007 7:59 pm » Post: #7 » Download Post**

Sorry you are correct its 400 RPM
I have a nagging habit of adding zeros, escpecialy while invoicing Very Happy

**Fri Oct 05, 2007 11:29 pm » Post: #8 » Download Post**

Is it pretty much the same compression on the MC21? 142lbs @ 400 rpm ?
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**Fri Oct 05, 2007 11:59 pm » Post: #9 » Download Post**

How do you get the 400 rpm?
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**Sat Oct 06, 2007 12:45 am » Post: #10 » Download Post**

With the kick starter Rolling Eyes

Should be about that rpm to get em going ??? Plus with the other plug out ..... No problem
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**Sat Oct 06, 2007 2:28 am » Post: #11 » Download Post**

Thanks to all........again, can anyone give a compression number that would indicate a cylinder that is tired? 130? 140?.......I have 12k on my NSR
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'93 MC21 250sp Repsol "Doohan"

Compression test

Compression test

How About the MC21 ?