Why is my bike missing when it is in high revs? please help?

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tom r

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i have a 50cc supermoto. When i ride it, it gets to about 6-7000 then randomly starts missing and sounds terrible. does anyone know what it could be? please!!! thank-you
its a cpi sm 50cc 2006, it does it in all gears at any speed (randomly) it can rev up to 11000 and doesn't have any limiter
ITS 2 STROKE BY THE WAY
 
> 6-7000 then randomly starts missing and sounds terrible.

The missing is usually related to spark plug and or plug wires, and other HIGH VOLTAGE ignition components (coils, etc.)
===
After than it could be fuel and fuel/air ratio problem. But first try a new plug. :-)


good luck...
 
> 6-7000 then randomly starts missing and sounds terrible.

The missing is usually related to spark plug and or plug wires, and other HIGH VOLTAGE ignition components (coils, etc.)
===
After than it could be fuel and fuel/air ratio problem. But first try a new plug. :-)


good luck...
 
first things first, check your plugs and plug wires, make sure its firing properly, if thats not the case, check your cool pack, on a 50cc bike your cool pack should be under the seat mounted to the frame. make sure you check all your air filters, after that if its neither one of those, check your carborater, if none of that fixes it, rebuild it. Good luck.
 
first things first, check your plugs and plug wires, make sure its firing properly, if thats not the case, check your cool pack, on a 50cc bike your cool pack should be under the seat mounted to the frame. make sure you check all your air filters, after that if its neither one of those, check your carborater, if none of that fixes it, rebuild it. Good luck.
 
Insufficient information. How fast is it going in top gear at that engine speed? Do you live in a country where it is classed as a moped, so top speed would be governed? Is it a 2-stroke or 4-stroke? Is it fitted with a rev limiter? Does it do this in all gears, or only top? Make and model and year?
 
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