I am looking for some help on here I have just bought two Roketa RTX-250 atvs.... I have gone through them with a fine tooth comb and tighten every nut and bolt I have added UNI air filters on both of them and changed the oil first thing my question is I want to change the spark plug to NGK I have went to there site I have the LG D8TC in there now when I put that number in it came up with NGK DP8EA-9 but everyone I talked to told me just to use the NGK D8EA can someone tell what the difference is and what one should I run please the motor is a Zongshen any help would be thankfull.... P.S. is the gaps the same for the new NGK of .028

 

Went to the NGK website and looked up both plugs. The DP8EA-9 is a projected tip plug where the other is not. The ceramic insulator and the electrode stick out farther.

Go to the following links and compare the tips:

http://www.ngk.com/more_info.asp?AAIA=&pid=3297

http://www.ngk.com/more_info.asp?AAIA=&pid=3647

As to which one you need, I don't know. Not sure if there is a difference in the tip projection into the cylinder. There could be a clearance problem between the tip of the plug and the piston.

 

The protrusion is for lower rpm motors. Having the electrode further in the combustion chamber helps keep it clean. [img]i/expressions/face-icon-small-smile.gif[/img]