just rode my bike and can do 60kmh but now when i do it starts to cut out like my be block in carby but no. my be spark plug no and yes. my bike never ran good at start may be 30kmh but when i opened the spark plug gap a lot sounds like a weed waker clean and can do 60kmh i ride at that speed all day but now it boggs new plug still no good maybe cdi no so out of luck i put new carby still no good same thing got an old china spark plug and now 60 to 65 kmh help help help i have had maybe 10 bikes and every one is different spark plug gap sum like it open and sum shut and then for how long till you put a new one and it is still no good so you change the carby no the plug gap no new plug no the sum old plug that did not work well at the start now is the best i don't no sooooo over it like i say it is fixed now