Im after a new spark plug I have a ngk br8es in atm some site say that's correct and some say br9es what's ones correct 98 dt125

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Aye bealz " the higher the number the cooler the plug , , whats the manual sayin, ?

BR8 is fine its the standard plug.

The 9 can stand higher chamber temperatures for sustained high speed work (on a dt?).

Downside is they make it harder to start.

I will just subtly add.

IT WILL MAKE NO, REPEAT NO, THAT IS UTTERLY COCK ALL difference to the bikes performance (power wise) whichever plug you pick.

For the benefit of the 125 tuning gurus/mates that know best but have never even touched a motorcycle.

Manual says 9

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Then fit 9. I just googled it tbh.

Plugs are something i swap out regularly. Changing from 8 to 9 you wont notice. But an old plug swapped for new makes a big difference.

Waiting till they are dead will waste fuel and hp.

I know the DT125R I bought new in 1988 had a BR9ES fitted as standard and it listed a 9 as the standard plug in the owners manual. Even with running in and pottering around town I had no issues with plug fouling and starting so I left the 9 in. The NGK application book says DT125 1988-2004 BR9ES as the standard plug.