HPI mt2, acting weird.

[thenameskam]

I have an hpi mt2, just got it from a friend and i ate up the spur gear, got a new one and replaced it and tried starting it, and the it would idle for 1 second and then shoot straight up to full throttle and hold there then cut off. did it every time i started it, so i noticed that the car's servo in the "neutral" position was almost full throttle so i adjusted it back to the neutral position. Now when i start it, it idles fun but as soon as i hit the gas, the engine starts to climb to full throttle on its own, and I've watched the servo/throttle in the carb and its not moving at all. I tried to tune it and see if that helped but i noticed it wasn't at all. so i turned the car ALL the way lean, and it ran and did the same thing, but it was spitting fuel right out of the exhaust a good foot. turned the car all the way rich and it was doing the same thing. i tried tightening the carb down to make sure i didn't have a leak, but nothing is working. Any ideas anyone? I'm about to just buy a new engine and be done with it! any help much appreciated!

 

[Ballen]

sounds like it may have an air leak. untuneable runs high .or carb is not working properly
like maybe bad HSN .how big is the ideal gap set .i would disconnect the linkage and adjust the ideal gap to about .5 mm hook up the linkage turn on the tx then the rx do not start it watch the linkageand servo and see if it opens the gap. if it does it needs to be adjusted (the linkage)and make sure the throtle trim is set right on the controller


hope it helps

 

[thenameskam]

Ya I've done all the setups, and I've watched the servo and it doesn't move. it idles fine sometimes, and other times the idle will just climb to full throttle and the carb is set to 1mm per Manual. I've tried adjust all the setups but nothing seems to help it so far, and when it does idle fine, if i get it just a little bit of gas, then the engine starts climbing to WOT all on its own and the servo/carb not even moving.