Steve,
If it starts, runs and even rides, but then dies when you open the throttle ... it may also be an air-fuel mixture problem ( the engine may not be getting enough air/oxygen) when the throttle is wide open and demand is at it's highest. Always before spending any money, do the simple things that don't cost much and can sometimes save you a bundle:
1. Throughly clean and check the air filter for debris that could slow the airflow to the carb - also airbox intake slots are free and clear.
2. Check your gas cap venting valve ( if stopped up will create a vaccum in the tank and starve your engine) (also easy/cheap fix)
3. Change your gas, clean and drain carbs ( maybe gummed up from old gas)
4. Check your air/fuel mixture screw ( on carb) to be sure it is in the correct position
5. Change your sparkplug
If these don't do the trick then the shop maybe your only choice; however, if one of these corrects the problem , then you are riding again for less then $25. Good luck keep us posted.........GM
The other cycles just wish they could be GREEN with envy! KX450F
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