decarb question

[jimmyz1]

Is it ok to run the decarb mix of 3/4 gallon of gas, 3oz. of oil and 16oz. of seafoam thru the carb. In the FAQ it says to use a 3 piece foot of hose. Is it ok just to rig a 3 gallon tempo like you would for normal operation and run this thru just like you would your normal mix. of fuel?

 

[HighTrim]

Re: decarb question

in a portable tank, mix 3/4 gallons of premix gas, an 3/4 can of seafoam, (assuming you don't have the vro connected). Put the remaining seafoam in a spray bottle, run the motor up to temperture, remove the plugs, one at a time, spray some seafoam into each cylinder and replace plug. Let it sit 15 minutes, remove the air silencer from the carb while waiting, restart motor, and spray seafoam into each carb, until it start to stall. Repeat until the seafoam is gone. Run out the remaining gas. It will smoke like it is on fire, and drip goo on the ground. Replace the plugs with new ones, and then do the compression check again. This procedure burns the carbon out of the motor and been known to free up rings and increase compression.

 

[dajohnson53]

Re: decarb question

Is it ok to run the decarb mix of 3/4 gallon of gas, 3oz. of oil and 16oz. of seafoam thru the carb. In the FAQ it says to use a 3 piece foot of hose. Is it ok just to rig a 3 gallon tempo like you would for normal operation and run this thru just like you would your normal mix. of fuel?

I think you're asking: Is it OK to just use my regular fuel tank rather than rig up the temporary tank that is described in the FAQ.

Yes it is OK to use your normal gas tank. Just start with an empty tank, and put the seafoam/gas/oil mixture in it according to the proportions listed in the FAQ.

I did the treatment using my built in tank. I just started with the empty tank, put in the seafoam/fuel mixture, ran it according to the FAQ directions, and then when I was done, switched over to my other built in tank that had normal premix in it to do some high speed running to blow it out.

If you use portable tanks, you can probably do the same sort of thing.

Is that what you were asking?

 

[ob]

Re: decarb question

What engine are you decarbing?Many later model John/Rudes are equipped with a schrader valve on the fuel primer just for this purpose.It allows the decarb product to bypass the carbs and flow directly into the intake chamber.OMC engine tuner is one such product.

 

[jimmyz1]

Re: decarb question

It's a 72 25hp rude. Yes I was just asking if it was ok to run it from your normal tank hook up right thru the carb.? I did buy the new 3 gallon tank. I can just hook it up with the fuel hose/primer bulb and run it right thru? right

Thanks for the replies.

 

[ob]

Re: decarb question

Yup.On that vintage engine it is just fine to run the seafoam mix straight through the carb inlets.An optional method for decarbing the cylinders is to use a decarb product directly into the cylinders via the spark plug holes after the engine has been run and is warmed up to temp.Then manually distribute by rotating the flywheel a few revs and let set several hours before running on regular premix to expell any loosened carbon.Either way you choose should be followed by removal and inspection of each spark plug for any fouling deposits.

 

[jimmyz1]

Re: decarb question

Either way you choose should be followed by removal and inspection of each spark plug for any fouling deposits.

How many times do I need to do this before the plugs stop fouling out? After decarbing it I ran motor for a while with regular fuel/mix and then I changed the plugs. New plugs were fouled out in about 10 minutes. Changed them again after hunting this morning and those plugs are now all black and fouled. I've use 2 sets of plugs in about 20min. of running. Motor use to run good before doing it and I think will run great if I can get the carbon out and the plugs stay new.

 

[ob]

Re: decarb question

The short answer is as many times as is necessary to clear all of the fouling deposits within each cylinder.I'm guessing yours were pretty carboned up before decarbing.Bare in mind that if the plugs are not actually fouled but just carboned up that a good cleaning and gapping is sufficient instead of replacement.Always use the factory recommended Champion plug as well.As a precautionary note I'll also stress that the engine should be propped to allow it to operate in its factory recommended wide open throttle operating range ,as overpropping will cause lugging of the engine at any throttle setting and will lead to cylinders becoming excessively carboned up which will effectively shorten the life of the engine.

 

[jimmyz1]

Re: decarb question

Thanks ob. I did the treatment 2more times and it looks much better. After I was done the motor was idling very nice. Pulled plugs when I was done and the plugs looked 95% better than the day before. I do use the recommended champion j4c. I actually went down from a 9x10 to a 9x9 prop. I think it just needed a few more treatments.

Thanks for all your help.

 

[tashasdaddy]

Re: decarb question

it probably had never been done. most people have never heard of doing it.

 

[Silvertip]

Re: decarb question

Get the boat on the lake and run the tar (literally) out of it. Idling will not blow it out.

 

[dajohnson53]

Re: decarb question

Get the boat on the lake and run the tar (literally) out of it. Idling will not blow it out.

+1. This should be done as the final step every time you do the treatment.

 

[richoj]

Re: decarb question

Question----The directions on an older OMC Tuner can say to use the Schrader Valve and inject in 2 second bursts, one for each cylinder. The newer OMC Tuner directions say to inject the entire can directly into the carb throats.

My understanding is that the older method bypasses the carb bodies and the newer method doesn't.

Does anyone know why OMC changed their directions and are the end results different ?

 

[iwombat]

Re: decarb question

Both methods essentially bypass the carbs by any kind of practical measure. Applying through the carb throat is a straight shot into the intake, none of the product travels through any of the internal orifices in the carb body.