kemputy

hi on my bike the carb was leaking through the overflow all the time , so i took the carb off and cleaned it all now there is no leak happy days but now when you start the bike and rev it hard it back fires and puts a blue flame out the exhaust . only had the bike 3 month and its got a leon vince tail pipe on dont no if that matters thanks neil

thanks for the replies

in the market to buy a wr250f and have just passed my test on a restricted liecence as im 18 just need to no wht the bhp is thanks guys