I just tune up my 7, i change the oil grade from 10w30 to 10w40 and put brand new sparkplugs. here is my Problem before i put the spark plugs, my 7 was running normal and poping flames at high rpms, well now i have put the new plugs it just runs nice and smooth but i miss the flames. Does anyone knows why it not poping?

 

are your plugs gapped right

 

Yes they are

 

The NGK OEM plugs that 99% of people purchas are not gapable plugs they are pre spected.

No flames huu... Your not geting enough raw fuel out the exhaust.

 

i really dont think the oil could play a roll in it but yet it might and also have you changed your driving style some

 

No the oil will not play any role in it. It is simply the amount of fuel delivery and unburned fuel passing through the exhaust.

 

I, have not change my driving style. But the funny part is that just before i got home i hear a pop, probably the plugs are giving in?

 

that could be it too