Thread: sx 125 need help please

having rebuilt a 2004 sx125 seven months ago the bike been running fine untill last week.
when the bike has been used for ten mins it will die when blipping the throttal and will cut out.
kicks first time and ticks over,done all the usual checks new air filter,carb off cleaned and settings checked.
now all i can think of is piston rings but how do you measure if you need over sized rings
also exc twin ring piston fitted when last rebuilt.
thanks for any help

Have you checked the plug?

yes new plug fitted was useing origanal ktm plug but still had problems so tried a br9eg plug and still dies

When it bogs down hit the kill switch then check the color of the plug