spark plugs

hi all my friend owns a rm 144 and i own a yz 125.his fouled a plug(ngk br9exv) recently and i have a spare ngk br9eg.is a br9eg ok to run in his bike?what does the exv/eg stand for?

i take it is a 125 with a big bore 144 kit and if so what year?

07 rm 144(big bore)

hi all my friend owns a rm 144 and i own a yz 125.his fouled a plug(ngk br9exv) recently and i have a spare ngk br9eg.is a br9eg ok to run in his bike?what does the exv/eg stand for?

The answer is here

o sorry it could have been vx,it seems the difference is the tip?does it matter that they are different?

It could. If the tip is to long then it could hit the piston. In the best interest of your friends bike make hime get the right plug just to be safe. A $5 plug is better then new piston.

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