Ok, on my nexstar the .46 has a lot of power. However I am just wondering, if the plane is at idle position and you completely go to full throttle does your engine die. Now I am wondering is that something that will always happen because the engine becomes to full of fuel? Or is that just a mixture problem? Also turning the needle clock-wise is leaning the engine, right? Please help me out. Just for some more information when I increase the throttle not as fast everything is perfect.

Also the nexstar was very easy to put together took me about 30 min. before the engine was running. Also the realflight software helps a lot.

Thanks
Stunner

The engine dieing as you increase throttle is usually a mix problem, probably the low end. As you look at the end of the HS and LS needles, turning them clockwise leans the mix. Set the high end first. Go to full throttle and briefly pinch the fuel line. If the engine dies immediately, it's too lean. If it runs a while, then dies, it's too rich. If it speeds up briefly, then dies, it's right. Adjust the low end so when the throttle is increased, it is smooth. The idle needle is adjusted in SMALL increments, about 1/8 turn at a time.

Dr.1

Stunner,

I also have the NexStar and Love it. I agree with the simulator - it helped me.
I have a .pdf of the engine if you would like it. Email me at [email protected].
Get an instructor to help you with the engine too. They have been around a long time and can also give you tips on things like the engine, props, etc. Good luck and fly safe.

Remember.. that low speed needle adjustment is very small! When adjusting it, same as the high speed needle, turn it inwards will lean it out, out will make it more rich. Usually turn clockwise for lean, count-clockwise for rich. But, only in very small increments, like perhaps 1/16 of a turn or less.

I played with mine for a good 15 minutes or so, going from idle to full throttle and back, then shutting down, adjusting the low speed mix, then restarting, checking the high speed mix and the transition from low to high.. adjust low.. and so on and so on. After you get it right, though, usually only high speed adjustments are necessary as the day changes (air density, humidity, temperature, and so on).

That's in my limited experience, anyway, others may disagree, but what can I say.

Dr1Driver has given good instructions. Just be very careful around the prop. I recommend shutting down the engine for adjustments. Safety first around the meat slicer.

Thanks, I tried what u said and it worked. I really just needed a very minor adjustment.

Deja Vu... I'm having the same trouble with mine. Going to full throtle quickly and the engine dies. Being stationed in Iceland means resourses are limited. I pretty much know all the pilots on base.

After doing the slow end, did you have to mess with the high speed?

Thanks.

Should not have to adjust more than a click or two. Hi-speed is where you will normally make your day to day adjustments for atmospheric changes anyway. Once set, your low speed shoud be OK unless you have a radical change in atmosphere such as going from a valley to a mountain top.

Man, I spent over an hour trying to get the carburetor right. With the limiter in place, max rpm was 11,070. The nexstar manual calls for an optimum max rpm of 12,600. On the low end, it seemed work fine at 3,810. Anything below that and the engine would blobber or dye with slight up throttle. After getting frutrated of getting nowhere with the low speed (I followed bubbagates procedure http://www.rcuniverse.com/forum/m_30...tm.htm#3002344 ), I decided to remove the limiter and lean the needle out to a max rpm of 12,600. Surprinsingly, iddle to half throttle improved. By this point I was tired and I called it for the day, plus I was getting cold. Since I tweaked the slow speed, I should make sure that it's okay.

Thanks for the feedback.

Have you considered moving? Mid 90's here today. When our skin turns red it isn't frostbite. [&:]

I too suffered from same problem on low end. A small adjustment to idle mixtured fixed that. I also had the plane die during full throttle after 3-4 minutes of flight..... As it turns out the best and first thing I should have done is put a fuel filter in between the take and the main needle. I found that small particles were being drawn up after running for a bit and cutting off fuel flow and resulting in an overly lean condition that usually resulted in me making a dead stick. As soon as the engine died, the particles returned back to the tank or floated around.

After adding the filter and cleaning out between it and the carb, all has been great.

Just a thought.

Cheers,

VG

Winds are calm today and the weather is nice, so I'll try some more tuning.

Should I leave max rpm at 12,500 or should I do max rpm minus 300rpm and the rich side. Then, adjust the slow speed.

As a US Navy nurse, I chose to come here. It's slow pace, I'm not in a deployable status since I'm isolated, and because of the high cost of living out in town I get an extra $1,900 a month.

I'll tell you how to fix it, get Saito FA 56 and fly.

Only our minds limits us.

Nutz13 - Missed the "stationed" part of your earlier post. Thanks for your service to the country. Yes, tune @ 300 RPM to the rich side for engine reliability. My gosh man, you're flying a trainer anyway, not a racer. Probably running 1/2 throttle most of the time once established safely airborne. Try to stay warm, we'll keep some heat for when you get back.

The winds are just below 10 knots (11.5 mph), so these are good conditions here. I'll tune @ 300rpm in the rich side and see how it responds. And you are right, once airborne I'm flying at 1/2 throttle. I'm hoping to be stationed in my homestate of Florida after my tour is up here on May 2007. Thanks for the help.