Yamaha Ring Free Shock Treatment

I am about to do the shock treatment using Yamaha Ring Free on my Honda BF130 four stroke and have a couple of questions. The shock treatment uses 2oz/10 gallons and I know I can buy a bunch of it and do my whole gas tank (70 gallons) but I've been reading up and some people recommend using a smaller gas can (5 gallons) and running it off that. So my questions are:
1. Is using a smaller gas can more/less effective?
2. Do I need to change out the spark plugs after the shock treatment? I know I have to change out the oil/filter when the process is done.
3. When I was reading up there was some discussion about not using the ring free on 4 strokes and only on 2 strokes, is that true?

Even Honda recommends using the Yamaha Ring Free in their engines, so I understand from my dealer. I've only done this once on my BF 225, so I am no expert by any means. Around here, Sea Foam is the preferred decarbonizer.

Two ounces per 10 gallons sounds entirely too weak to me if the idea is to decarbonize (shock treat) the engine. The 2 oz per 10 gallons sounds more like the normal maintenance treatment. My engine is in for a 400 hour maintenance, so I can't get my hands on the Ring Free I carry onboard. I would call a reputable shop and ask the service manager their opinion. Also, check online under engine decarbonization.

If your goal is to do a real decarbonization, then you definitely want to use a small external tank. You only need about two gallons of the Ring Free-Gas mixture. Personally, I use a 6 gallon tank with a pump-up bulb which I attach directly to the onboard fuel/water separator. Any you don't use needs to be disposed of. I dump it in my truck's gas tank.

Hopefully the following doccument will give you some more insight.

HOW TO DE-CARB ANY MARINE MOTOR INCLUDING AUTO’S
BY DUNK!THE MASTER TECH
This worksfor Carbed, EFI, Ficht, HPDI, Optimax and even 4 strokes…
First you need a separate small fuel tank. One of those 3 gal red Tempos worksgreat or an empty gal milk jug will also work, but might be a bit messier..
I useSeafoam over the OEM stuff like OMC Engine Tuner or Merc Power Tune because inthe last few years they changed the formula and you have to let them sit up 12hours. Who’s got time for that?? Seafoam you can buy from NAPA, CarQuest orother auto stores. Seafoam works in 15 mins.
You’llneed 3/4 gal of gasoline and one 16oz can of seafoam for each engine. Don’tforget to add 3oz of oil if you are premixing in a carbed engine. Use about 3ft piece of fuel hose off the little tank. You connect this tank to your engineby pulling off the main tank fuel hose off the intake side of your waterseparating fuel filter and plug the hose off the small tank on to that fitting.Or you can separate the fuel line on the tank side primer ball, so you canstill use your primer. If you have an engine that has fuel plug then you need afuel plug on the little tanks hose.
Start theengine, let it warm up and start pulling the mix into the engine. You may haveto increase the idle to keep it running once she get loaded with the Seafoam.Run the engine 15 mins in the dock or just cruising around under 2500. Thenshut it down and let it sit for 15 mins. Restart the engine, the smoke you seeis the carbon burning off. Do the whole thing again and let her sit again for15 mins. If she smokes after the second time do it again, but I’ve never seenone still smoke after three doses. The gallon mix should be enough to do this 3times. You don’t need any wide open throttle, you don’t need to change theplugs. If it’s cleaning the combustion chambers it’s also cleaning the plugs,but every 50-60hrs is good time to change plugs in most engines.
I cleaneda antique evinrude one time that had a 1/4″ of solid carbon on the exhaustchamber walls by running a 1/2 gal of the mix through it. Seafoam has beenaround since the 30′s and it’s what they used when they were burning straight 4stroke 40SAE oils in outboards.
You guyswith the 4 strokes think you are immune from this? Those engines work 10 timesas hard as any auto engine ever will and they will carbon up. I bought a Broncotwo years ago that had 95,000 miles on it. When I used seafoam on it I had theneighbors hanging out of their front doors looking for where the fire was afterI started it the first time there so much smoke.
Too manyare under the assumption that it’s totally the 2 stroke oil that causes thecarbon, Wrong… it’s also the additives they put in the fuels today. The carboninhibitors in 2 stroke oil are there for this reason also. Remember whengasoline used to smell like gasoline, today it smells more like bad cologne.
For thoseguys that like to do the carbon treatment by spraying it down the carbs Seafoamalso comes in spray can called Deep Creep. It’s the same stuff under pressure.Says right on the can Oxygen Sensor Safe, for you Yam guys.
After thatif your engine maunf recommends a daily additive treatment then do that in themean time, but all 2 stroke outboard need decarboned every 50-60hrs. If I owneda 4 stroke I would do it the same. Once you are set up with the tank and hosethe Seafoam is only 5-6 bucks can. It to easy not to do it

thanks CHawk, I read that thread you posted and was thinking of doing the seafoam treatment before I did the yamaha ring free treatment. My mechanic also said the yamaha ring free was recommended for our Honda engines. I'm a bit worried though that perhaps some of the carbon might be a good thing on my old engine and I might lose compression after getting rid of it.

c-level - I think you're giving away your age!!! Back in the days when I could disassemble a Chevy 235 blindfolded, you had to consider that. I remember when HD oils were introduced, and the problems they caused with the old Chevy and Ford engines. But with these modern engines, clean is good, in my opinion. So I would decarbonize away, within reason.

Maybe Jimmy (JGMO) would jump in here and opine on the subject, since he seems to have the experience with the older Honda's.