Spark plugs sym 300i gts  By  chucky (Read 586 times)

The 7hsa is a slightly hotter plug than the cr8e I believe,,atleast thats the way all other NGK plugs are rated,,if the outside temp gets really cold or you have trouble burning all the fuel efficiently you can stay with a hotter burning plug.Guess they want hotter for break in to help set the rings,,Im not sure why,,a motor will run hotter before its broke in as it is,,not really necessary to run a hot plug during break in IMO.

I just run a NGK CR7HIX in my 150,I use it all spring,summer and fall with no problems,,if you can get Iridium they last so much longer...if your scooter runs fine with the after you switch to the 7 series just keep an eye on how it runs,,if it runs too hot switch back to the 8,,I think you will be fine with a 7.

Too answer your question is hard,,every motor runs a little different,,if you where going to up jet and do a performance pipe,,more fuel would be dumping into the combustion chamber so a 7 might be the way to go,,a little hotter spark helps ignite that air/fuel just a bit faster.