Nsr250 fouling plugs

[mad_max]

Have a mate whos nsr250 is fouling plugs
He gets new plugs and last about 3 rides. What could this be?

Is on standard oiling system
Running BR9 plugs
New leads

Havent had a look yet, Could it be wrong plugs? Oil mixture wrong?

[gammaguy]

possibly a combination of tired pistons/rings,and/or tired or badly set up carburetors,I have had that issue many times in the past with the NSR,it is a finely tuned piece of kit and does not tolerate poor setup or tuning.

When a 2T does not combust cleanly the plugs are usually the first to play up.

There are other variables too such as too much oil or poor quality oil or even simply a blocked air filter.

Before you go ripping into the carbs,check the basics first.

[spanner spinner]

check the compression, most two strokes i have seen with this problem have needed a top end freshen up, but as has been noted earier check the basics first ie check for blocked air filters worn carbs ect

[FROSTY]

simple question. How is your buddy riding? it may be just that he's lugging it around like a four stroke