NGK CR9 spark plugs

[Janne339]

Many different NGK CR9 spark plugs??
CR9E are the stock plugs. What are you guys running?

 

[stormin norman]

CR9E NGK. Have not had to change plugs in any 4 stroke I have owned.

 

[cannondale27]

CR9EK is what I run since I have a box of them from Phazer and Cannondales but made no difference in anything as far as I could tell. I am tempted to try Platinum since they are known to solve some fouling,poor running issues. Was a good report on them in last few days also.

 

[Yamadog]

I have to check but I think wot bought a batch of 10 's with the 4 electrodes and startup was much improved

 

[Janne339]

CR9EK is what I run since I have a box of them from Phazer and Cannondales but made no difference in anything as far as I could tell. I am tempted to try Platinum since they are known to solve some fouling,poor running issues. Was a good report on them in last few days also.

Can't see any Platinium in the NGK CR9 list? Only Iridium. Bosch?

 

[cannondale27]

Can't see any Platinium in the NGK CR9 list? Only Iridium. Bosch?

Would think iridium would be better than platinum. Same design better material?

 

[johan]

I have iridium plug but hasnt tried them yet. next week my 16 engine is ready to go 300hp then i will test them

 

[Janne339]

After reading on NGK website its the CR9EIX if you will test iridium spark plugs. Maybe CR9EIA-9 for guys running turbo with head shims? CR9EIA-9 projects slightly deeper into the combustion chamber.

CR9EIX

CR9EIA-9