I have a E1 500 quad. When I throttle up, it takes off, then cuts out at half throttle. I have replaced the throttle and control box. Any suggestions

Just a guess, but check the fuel filter. Clean it if you can or just replace it. I have had a similar problem with a different vehicle, and after doing everything else it turned out to be a 99 cent fuel filter.

Odds are it's the carb. Start with a clean air filter and box, check and make sure your plug is good. Pull the carb and disassemble and clean with carb cleaner. Blow it out with air, check all air passages. I summarized this of course. 90% of the time it will be crud in the carb.

Hey Jason,

What?? .. slow down and give me more specific detail.. this is not a complicated problem .. just need more info.. could be a simple clutch adjustment... or you need new clutch fiber plates??

No, it is either an electrical problem or fuel delivery problem.

clean your carb

Sounds like something electrical is getting wet. in your shop , or driveway , start quad and run up till it's warm. Then take a spray bottle and spray all electrical connections starting from the bottom and work your way to the top. theres lots of connections on these quads. It's going to take some tome unless you get it to duplicate what it does on the trail. When you find the culprit use Dielectric silicone to water proof the connectors . Good luck . thats about the only way to go about this reapair , it takes patiance and time

when engines not running turn the gas off . And it sounds like you need to adjust your throttle pin that goes into the carb take the clip off the pin and move it down one good luck

Very vague question but I will try anyway if it died at full throttle and won't start again check the copression if it is below 90 psi it needs the top end rebuilt also when u pull the spark plug out look at it if it is whitish and dry definitely needs to be rebuilt running to lean if compression is good carb or electrical problem hope this helps you

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your main jet is dirty. clean the carbs.

it needs a set of rings and maybe a piston then it will be like new again