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Old 10-17-2010, 01:40 PM   #1
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i got a hpi rs4. its the rtr with the stock .15 motor i bought it from a friend. now, ive had it for maybe a week and the first couple gas tanks it ran fine except when i hit the brake after full throttle it would die so i adjusted the carb stop/idle screw and that fixed that problem. now, after i start the car it runs fine, idles fine where it barly creeps forward which is fine for me. but after running it and warming it up i cannot get it to start again. what would couse this, i have tried adjusting my needle that is in the bronze sleeve and it seems that it has little to no effect, i had it way up, whihc i guess is super rich, it would start but not run, i dont want to have to adjust the carb every time so help me out with this one.
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Old 10-17-2010, 03:53 PM   #2
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From the sounds of it, to me it sounds like the heat gets to the carb and evaporates the fuel. Does it work/start when you put some fuel down the car opening? RTR engines commonly do this in my experience, not that there is anything wrong, but its just how they are designed - or not designed enough!
If you could spray some compressed air over the carb closest to the engine to cool it off - champ drivers did this when their engines flamed out in a race.
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Old 10-17-2010, 05:21 PM   #3
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Originally Posted by gt fast View Post
i got a hpi rs4. its the rtr with the stock .15 motor i bought it from a friend. now, ive had it for maybe a week and the first couple gas tanks it ran fine except when i hit the brake after full throttle it would die so i adjusted the carb stop/idle screw and that fixed that problem. now, after i start the car it runs fine, idles fine where it barly creeps forward which is fine for me. but after running it and warming it up i cannot get it to start again. what would couse this, i have tried adjusting my needle that is in the bronze sleeve and it seems that it has little to no effect, i had it way up, whihc i guess is super rich, it would start but not run, i dont want to have to adjust the carb every time so help me out with this one.
Sounds like it's either running too hot or loss of compression. Once the engine heats up shut the engine down and check for compression. It might be time for a rebuild or pinch. A super hot engine will always be hard to re-start.
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Old 10-17-2010, 07:02 PM   #4
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you may have the idle so high And your running too lean. Try going down on idle and 1/2 turm CCW on LSN.
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