J200STLCDR Compression Test results

Orval

Seaman
Joined
May 20, 2018
Messages
60
V6 200hp. J200stlcdr
I checked compression on all 6 plugs.
Looking at motor from standing behind back of boat...Left side is from top to bottom 120...112...112
Right side from top to bottom 100psi on all 3
I am not for sure if that is acceptable or not?
 

Orval

Seaman
Joined
May 20, 2018
Messages
60
Starts and idles okay on muffs.. Put on a small pond before making long trip to the lake and had to adjust idle just to get in gear. Did not seem to have any power and bogged way down and would not accelerate.
It died. pumped bulb, started up ..repeated a few times to get back to trailer.
Checked spark and had it on all cylinders.
So I checked compression and got those results.
Plan on decarb..change fuel lines and bulb..and making sure all the fittings are good.
Was concerned about compression results.
I am not at all familiar with VRO or V6's. Did not want to spend a lot of time and money if the engine needed tore down anyways.
All in all, seemed like the gas/carbs needed a good go through. Can compression cause these problems?
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
IMHO your compression is not that bad. Look for something else.
 

Orval

Seaman
Joined
May 20, 2018
Messages
60
If I take these carbs off and clean, will I have to "reset" everything or would I be okay to just put back on the way they came off?
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Put back on the way they came off. Just don't change any linkage adjustments. You may want to take a bunch of pictures.
 
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