correct spark plug

[Dakota Drifter]

2009 800r XP
My sled came with BR10's but the dealer gave me BR9's for spares.
What plug should I use ?
What is the difference between these plugs ?

 

[Thump]

Some sleds were shipped with wrong plugs (BR10). BR9s are the correct plugs. the BR10s are a colder plug

 

[Snoclo]

Br9ecs'

Alot of 09's came with BR10's, I put BR9ECS' in after a couple days of break in riding. Never noticed a difference in either, riding or pattern on the plug

You want to get the BR9ECS, not the -5's. Gap is different