engine troubles
 

I have been flying my nextsar after a crash that wrecked it (a lot of it) and after i idle or have it at low throttle for awhile, it stalls when i try to put the throttle up. I've done everything I know of (not very much) but it still stalls. what is the problem? I wouldn't know.

RE: engine troubles
 

Well not know how bad you stuffed it or if the crashed filled the carb with dirt or any of it but when you advance the throttle and it gets rough or quits would lead me to lean out the low end to check it. One way to double check your low end is if you can get it to idle, either remove or pinch off the fuel line while its running.(be careful) If the rpm increases before the engine quits, your low end is to rich. If the rpms just go down and the engine dies-too lean.

RE: engine troubles
 

Hardly anything got into the carb. could you explain low end please? im just not a engine genius. when i try to adjust the needle valve, it won't go any higher(rpm)

RE: engine troubles
 

You didn't say what kind of engine or carb, but I would start by opening the mixture just so you can tell it is rich. Then on to the low speed adj. mentioned by cylic. If your carb has a small hole in the front, it is probably is an air bleed and there is probably a horizontal screw that will adjust the idle mixture. If there is no hole in the front, there is an adjustment on most carbs opposite the needle valve. give it a try. It sounds like your idle mixture is lean also. Adjust the idle mixture in very small increments or you will get way off and be in worse shape than you are now.

RE: engine troubles
 

The Nextar comes with an OS 46 FXI engine which is similar to the 46 FX, but includes needle limiters like the Evolution engines. The low speed needle is in the center of the throttle arm and the high needle is in the back of the engine. It is NOT air bleed.

RE: engine troubles
 

Also since it was stuffed, make sure the clunk isn't stuck in the front of the tank. A kinked line will make it run lean, if it will run at all.

RE: engine troubles
 

It sounds like the low speed needle setting is either too rich or too lean. You should follow Cyclic Hardover's pinch test to see which it is. Another diagnostic symptom is HOW it quits. If it is too rich, on sudden throttle opening the engine will sputer & stumble, then quit. If it is too lean, it will cut dead without the sputtering & stumbling.

Adjust the high speed needle so that the engine is peaked (tuned for max rpm), then bring it back to idle & wait for about a minute. Then do the pinch test, or sudden acceleration test. This will let you determine whether the problem is an over-rich or over-lean condition.

To fix the problem you will need a slender blade-type screwdriver. Stop the engine & insert the screwdriver into the hole in the throttle barrel on the throttle-arm side of the carb & engage the slotted head of the mixture screw. To lean it out, turn clockwise, to richen the mixture, turn the screw anti-clockwise. Do the adjustments in small increments (~1/8 turn) with the engine off, then re-start & test. Continue until the problem goes away.

With the high-speed needle limiter you will probably not have to change the high speed needle adjustment between tests. If you have removed the limiter, ensure that the engine is peaked at full throttle before each idle test.