Dies shifting to second.

[robtangie]

My first real chance at some decent weather to get my Maxx out and give it it's first few runs. Run a couple tanks now working out bugs, testing everything, and trying to do some tuning, (it's new to me, but a used 2.5).
After spending a lot of time running very rich and working it down to a safe level it began dieing at it shifted into second gear today. Just like someone had hit a kill switch at it shifted. Being inexperienced I was thinking it was too lean and starving itself at the top end,,, but after several attempts going up and down with the LSN I still can't seem to get it to stop. I did however lean enough that I hit a very sweet spot and the thing really came to life. Starting good, idling good, nice throttle response, and shifted like it should a few times. But then, out of no where it died again. Nearing the end of a tank, I gave up for the night.
Is it possible that I'm still running too rich? Or dose someone have a suggestion of something else I may be doing wrong?
Regards,
Rob.

 

[knall]

Mine was doing ALMOST the exact same thing. Shuts off like a switch right as it tried to shift. Once in a while it would "shutter" a bit first then die.

Problem turned out to be my shifting point. open up the little rubber plug on your trany, spin the wheels and spur gear untill you can see the allen screw down in that hole. 1/2 turn counterclockwise should do the trick.

Also a new glow plug never HURT anything.

 

[ThunderTiger]

With the 2.5 engine, try to keep the tank above a 1/3 full level. With the revo, if you run the tank low below 1/2 tank, you start getting into lean running. Running the tank almost dry makes it even worse. If you keep the tank topped up with fuel above 1/3 full, you will help alleviate the "leaning" condition associated with low fuel levels. That is not BS, that is from personal experience.

As to your shifting problem, you want, ideally, the tranny to shift inside 60 feet (Approx 20 meters) or, alternatively, halfway through the RPM range to allow the engine enough remaining torque to push the rig through to second gear and continue on to peak engine RPM.

A classic sign of a shift point set too high is that when it shifts it either bogs down the engine RPM's to a point that the engine wants to flame out (die) or just plain quits, as knall pointed out above.

Of course, tuning can have an effect also and this is without taking into account a dull glow plug that no longer operates as it should which further affects engine performance without considering tuning.

Nitro is a very steep and complex learning curve....................

 

[robtangie]

Thanks for the input guys... Yes the "flame out" is exactly what it's doing, and it is set to shift at a fairly high rpm.
Weather prevents me from doing anything with it today but first chance I get I'll give that a try and report back.
Thanks,
Rob.