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I'm a believer.............

S

Skooter

Advanced Contributor
in decarbing. I admit I was skeptical of how much it could improve, but the proof is in the compression numbers..look at the dramatic increase..I know cyl #6 is low and didn't improve much, but overall I'm still impressed with decarbing.
Cyl #1 180 194
#2 172 208
#3 171 194
#4 171 198
#5 179 204
#6 159 162
 
You could always do your decarb again or even a couple more times.

Not sure if you are using Sea Foam, Engine Tuner, Yamaha Ring Free or whatever.

You might also try, tilting your motor all the way up and position #6 piston down in the cylinder. Then fill the cylinder up with you decarbination product. Let sit all night or so, then run the motor pretty hard under load. Then check compression again.

That might help.

In any case, when you are finished with your decarbing.....be sure to change the motor oil and filter. You can be sure that the oil is very fuel saturated or contaminated.



Mike
 
I used sea foam 4:1 mix..I was tempted to fill #6 as you mentioned...prob will do that tomorrow.. I'm going to run it on the water this week
 
I've never had to decarb my 225 because I've always treated the fuel with ValvTect Marine or YamaLube Ring Free . But when I was dependent on old 2-stroke engines, a good decarb with Sea Foam worked great just about every time.

One addition to what Mike suggested about filling the cylinder with Sea Foam while tilted all the way up - put the spark plug back in, pull your kill switch lanyard, and crank the engine briefly, then remove the plug and put in more Sea Foam. This will assure that the stuff gets around the valve seats and the lower compression rings.
 
chawk_man said:
I've never had to decarb my 225 because I've always treated the fuel with ValvTect Marine or YamaLube Ring Free . But when I was dependent on old 2-stroke engines, a good decarb with Sea Foam worked great just about every time.

One addition to what Mike suggested about filling the cylinder with Sea Foam while tilted all the way up - put the spark plug back in, pull your kill switch lanyard, and crank the engine briefly, then remove the plug and put in more Sea Foam. This will assure that the stuff gets around the valve seats and the lower compression rings.
Click to expand...
When doing it like this, am I risking damage to valves or piston, due to the compression of the liquid?
 
Agree - a lot stronger, maybe 1:1. It shouldn't damage anything with the low crank speed, but to be on the safe side, just bounce the starter a few times. As I said, you want to get that Sea Foam onto the valve seats and lower compression rings.
 
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