krokodyl

Are there any signs exept the car hitting high speeds? Also how is it possible that the cars engjne is hitting top speed without opening the air valve? it stays at 1 mm. I have already had this problem and returned the car now i am hoping to fix it. It worked the 5th time then i put it away for winter. It wsnt tuned just broken in. sat for 2 onths started it up and boom it wants to run away plz help.

nitroexpress

Either you don't have a throttle return spring or your throttle linkage is misadjusted. With the radio off, the throttle linkage should be able to positively close the carb slide, based on the gap set by the idle screw.. It is not possible for the engine to hit top speed without the throttle slide (air valve) opening.

If nothing else, take off the air filter and look down the carb throat when the engine is hitting high speed. Use your finger to manually close the engine throttle slide. Make sure your idle screw is not too far clockwise and holding the slide open. Check for linkage binding and throttle spring adjustment.

krokodyl

i dont have a throttle return spring but the throttle is neutral and the engine is still revving very very high. I will check to make sore that the gap isnt opening.

krokodyl

Also how does the car know when to turn the wheels and when to idle? Pushing the throttle just increases engine speed.

cbaker65

It is possible for your engine to over rev if your engine is out of tune.If the engine is leaned out
too much,it will rev up,an engage clutch,so either the engine is out of tune,or the throttle is out
of whack an not properly set right in conjunction with the transmitter.

Theres a set screw on the carb. that only lets the carb. close so much,an theres also a throttle
trim on the transmitter that also can be adjusted...

krokodyl

throttle trim is good no need adjusting. I'm guessing that i need to richen out the lsn until the engine calms down. However then the engine will NOT pass the pinch test witch i dont like. i will adjust it and go from there. I still dont understand how it all works. when the engine revs high the clutch connects engine to wheels? Thanks for the help.

cbaker65

Yes,so what you have,is a too lean issue causing the engine to rev.Also,you have to consider the type of fuel,an
the area,as in altitude,an your tempature.

An as far as checking for clutch,all you have to do is rotate the flywheel itself,when you rotate the fly wheel,the spur should
not move.Dont rotate the clutch bell,only the silver round plate behind the clutch bell.If you rotate the fly wheel,an clutch
bell moves with it,then you have a problem..

krokodyl

yup clutch is fine so thats not it. I will richen it up and see what happens. Thanks for the help

nitroexpress

You started two threads for the same problem? On the other thread, you mentioned a pinch test of 10 seconds. The pinch test is only a ball park setting. Even so, 10n seconds is way too much. 5 seconds would be more reasonable.

From all you've posted, seems your linkage is maladjusted or binding. Do not use the radio for any throttle adjustment.

krokodyl

Sorry about that. I solved the problem by tuning it better gap was slightly to big.