Compresion

[bachoau]

Trying to find out the compression for a mercury 200 2 stroke 1999 with 250 hrs

[robothefisho]

Probably be around 110-120. So long as they're all within about 10 pound of each other.

[Steeler]

Trying to find out the compression for a mercury 200 2 stroke 1999 with 250 hrs

If you are trying to find out the compression of a motor use a gauge.

If you are asking what is a reasonable result after having performed a compression test i would think anything no lower than 105 psi without a varience of approx 10% across all 6 cyl's.

Keep in mind those figures are cold crank figures

[bachoau]

Ok boss thanks for the info

[BM]

You will likely find most V6's to be under 100psi but as mentioned consistent readings (within 10%) is the more important factor.

[gazza2006au]

Remember to disconnect your throttle and open it WOT than do the compression test, also all gauges will read differently some lower than others so go by the 10% rule and you'll be ok