De-Carbing old Mark 78

[gwmark78]

I have a 1959 mark 78A which is running ok-starts good and runs out. Maybe a little rough on idle, although I really do not know how well they are supposed to idle in tip top shape. I have read alot of posts concerning decarbing. We have had this motor in the family since new and I'm pretty sure it has never been 'decarbed'. My question- Is this a good thing to do? and if so, what is the proper and correct way? Thanks

 

[Kenny Bush]

Re: De-Carbing old Mark 78

Put a couple of cans of SeaFoam Powertune and put it in the gas tank. Great for decarboning.

 

[Laddies]

Re: De-Carbing old Mark 78

It won't hurt, get a can of Mercury Power Tune and use as per dirctions on the can

 

[gwmark78]

Re: De-Carbing old Mark 78

Thanks guys, I appreciate the response. We'll give it a try in the spring.