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Discussion Starter · #1 ·
ok i had a post on here somewhere before but i cant find it anyways my prob is my 300ex isnt running right when it gets warm whenever i get 3/4 throttle when its warm it starts to lunge im thinking its the valves but im not sure its got a new cdi coil carb has been cleaned and rejetted for my exhaust so im running out of ideas and money so idk what to do or if it is the valves any ideas? other than that it runs great
 

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is it a noticable tone change in the engine or can you just feel it? What jets are you using and have you moved the needle clip?
 

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Discussion Starter · #3 ·
i can hear and feel it and i went from a 122 to a 125 jet for my exhaust and i havent moved anything it did this before i messed with it so idk what it could be
 

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You will need to remove the carb bro and clean it really good remove the slow-jet and give it a good cleaning I think you may have a piece of trash in your Idle curcuit also check your fuel line for kinks.
 

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You will need to remove the carb bro and clean it really good remove the slow-jet and give it a good cleaning I think you may have a piece of trash in your Idle curcuit also check your fuel line for kinks.
^^^^agreed i've had the same problem after changing jets but it lurched at about 1/4 throttle.
 

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I agree. That's what it sounds like.
 

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Discussion Starter · #8 ·
the carb has been cleaned but it still does it it even did it before i put the new jet in it if theres a load on it like im going up hill it doesnt do it as much as if i was on flatland it also doesnt do it right away its after the motor warms up is when it does it
 

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the carb has been cleaned but it still does it it even did it before i put the new jet in it if theres a load on it like im going up hill it doesnt do it as much as if i was on flatland it also doesnt do it right away its after the motor warms up is when it does it
If it were more hesitant going uphill or under a load I would say the coil is breaking down, if you are running the airbox lid pull it and run it and see what it does also check your choke lever they will some sime kik on just a tad with vibration.
 

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Discussion Starter · #11 ·
my airbox lid is off it has a new coil new cdi the guy i bought it from had just put a new clutch in the carb is clean as can be and the choke lever doesnt move at all unless i pull on it im starting to think im hitting the rev limiter. the quad doesnt hesitate at all it accelerates quick and has all the power but it still lunges at close to top speed or maybe that is top speed hell idk
 
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