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MrTube · 06-16-2011, 12:12 PM

Ah,
Maybe it wasn't my two Yamahas as they are 4 strokes. HOWEVER I have worked on many 2 strokes in the past. I probably just made the assumption all pistons had it and thought it was fact. I have rebuilt 2 stroke engines and obviously had to install the rings on the pistons. I have never had to rebuild a 4 stroke so never had a very close look at the pistons in hand.

You would think a 4 stroke would need it almost as bad. If and when the two notches in the rings line up this would certainly reduce compression no?

06-16-2011, 12:12 PM	#25
MrTube Senior Member Join Date: Jun 2010 Location: New Jersey Posts: 1,471	Re: zddp oil additive Ah, Maybe it wasn't my two Yamahas as they are 4 strokes. HOWEVER I have worked on many 2 strokes in the past. I probably just made the assumption all pistons had it and thought it was fact. I have rebuilt 2 stroke engines and obviously had to install the rings on the pistons. I have never had to rebuild a 4 stroke so never had a very close look at the pistons in hand. You would think a 4 stroke would need it almost as bad. If and when the two notches in the rings line up this would certainly reduce compression no?