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Old 06-09-2008, 05:58 PM   #1
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Default 8ight beginner question

hey, just got my 8ight the other day and was breaking in and tuning the engine tonight. everything has went great except 1 thing. when i hit the brakes...the engine dies??? the engine runs perfect any other time. whats the deal???
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Old 06-09-2008, 06:13 PM   #2
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I would read this http://www.nitrorc.com/articles/carb/default.asp
sounds like you need to adjust the idle mixture.
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Old 06-09-2008, 06:15 PM   #3
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Exclamation engine idle

you need to adjust the idle screw ,it is colsing too far and fllooding the motor with too much fuel and this is what causes it to die when you hit the brakes assuming your throttle linkage is set up properly.the idle set screw is located on the side of the carb remove your air filter look into the carb you should see a gap about .2 to .3 mm if not open the gap slightly and try again running the motor and hitting the brakes .or enlist the help of another racer or hobby shop for more helpin setting up your carb
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Old 06-09-2008, 07:09 PM   #4
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Adjust the sub-trim on your radio. With the electronics on and the engine OFF apply the brakes while looking at the carb. The carb should not go any farther closed. If it is you need to move the servo horn a couple teeth or use the sub-trim adjustment on your radio to move the throttle linkage towards closed. But after doing that you'll need to set the brake EPA again so the throttle servo isn't trying to push against a collapsed spring.
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Old 06-10-2008, 08:49 AM   #5
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Check for a stuck clutch shoe or bad clutch bearing also.
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Old 06-10-2008, 09:39 AM   #6
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thanks for the help guys! i went out and took the air filter off and found my idle screw was the problem. the engine was fine at idle...but the screw was backed off too far and letting the slide close when hitting the brakes. adjusted the idle screw and re-tuned this morning...and everything works great now.

on a second note. a friend of mine kept saying, DONT BUY A GAS CAR, DONT BUY A GAS CAR!!! so far, this tuning thing hasnt been too bad at all. i just go buy the book and 20 minutes later...done. once i know exactly what to do, the tuning time will probably be cut in half.
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