Hi,

Does anyone know what the compression numbers are for a 1991 F2 CBR 600? (cold engine)

Thank you.

 

179-183psi is what my manual says. So around 180. Will vary more depending on your gauge.
It's probably more important that all 4 cylinder read about the same - within 5% of each other.
Otherwise you'll start to sound like a harley and you don't want that.

 

Seem to remember that mine were around 155-160 last time I checked.
Could be gauge error. Could also be my cylinder walls are shaped like eggs.

 

Hi,

Just did a compression test and all the cylinders have 75 psi...

I tried to start the bike and everything ran like it should.

Am i doing something wrong ?

 

Are you holding the throttle open when you crank?
Did you pull all the spark plugs?
Has the bike been sitting/parked for a long time?
Is bike extremely cold - like it's winter cold?
Was the choke on?
Is your gauge fubar?

If the bike runs fine, then you've got more than 75psi.
Your reading is wrong for some reason.

 

Hi,
My gauge was fubar, bought new one and readings are normal.
Thanks for help!