decarb

[gmlees]

What are people refering to when they say you need to decarb the engine. I would guess they are refering to the carbon build up on the piston and head in the combustion chamber. I do not understand why a carboned up engine will show less compression, seems like it would have more. I guess I am missing something about the charge volume that comes in being less because of decressed flow?

 

[Bifflefan]

Re: decarb

As for the decarb part, your right on the money.

As for the other part, I dont think a carboned up piston will show a drop in compression. (I may be wrong). What is does is, the carbon will get red hot and hold the heat causeing the engine to pre-detinate or "run-on" after the key is shut off. Im sure there are a ton of other bad things, but you get the idea.

 

[CatTwentyTwo]

Re: decarb

I think that the issue is with the rings. With some carbon buildup, they can stick in their grooves and not seal against the cylinder walls properly.

 

[robert graham]

Re: decarb

If you're running a 2 stroke motor then the best thing you can do is run the Yamaha Ringfree at the "deposit removal" dosage for a couple of tankfuls, then use the "deposit prevention" dosage from then on. If your motor is running fine now then it can only get better. If your rings are stuck in their grooves with carbon then hopefully the Ringfree will loosen them up before there's a big problem. Belive me, the Ringfree is a whole lot cheaper than the alternative power head failure and you have the satisfaction and peace of mind knowing your motor is "right". Good Luck!