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Low speed needle

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Quite often, engines go through a period called "The break in blues". It can get frustrating, wondering why they stall, and why they are stubborn starting. Bear with it, it will pull through
Start with a fresh glow plug. Plug the exhaust for a few seconds while spinning the starter to prime the carb. Raise the throttle trim on the radio to raise the idle till it starts and warms up.
 
Rolex said:
Quite often, engines go through a period called "The break in blues". It can get frustrating, wondering why they stall, and why they are stubborn starting. Bear with it, it will pull through
Start with a fresh glow plug. Plug the exhaust for a few seconds while spinning the starter to prime the carb. Raise the throttle trim on the radio to raise the idle till it starts and warms up.
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So your saying I won't have any annoying problems down the road? I hope so. I'm going to run it again this weekend and test it out off road. If dirt gets on the electronics and the engine, will it hurt it? I'm pretty sure if you drive off road, it will get dirty under the body right?
 
Once an engine if fully broken in and properly adjusted you rarely have to do more than change a glow plug or tweak the HSN for outside temp and humidity.
Dust and dirt gets everywhere, so just be ready to do more after run maintenance as far as cleaning. It's normal. Getting them wet is a much bigger problem.
Most importantly, use a good air filter like Motor Saver.
 
You know guys, I really have to second Rolex on this one. I first bought a Revo and broke it in exactly according to the manual. No troubles. I only had to adjust the shift point on the trans once it was fully broken in.

Then bought a T-Maxx. Again, followed break-in instructions to a 'T'. Engine is perfect, and only adjustment was to the idle after the third tank. Thing was doing wheelies on demand at tank 5 with a nice crackle at the pipe. Only thing that went wrong was the trans ate a gear on tank four, but I already replaced that. Fiddling with the screws before tank 5 will only get you lost. Go play pit stop mechanic once you have a properly broken in engine. Your engine should run so well if the break-in procedure is followed that you will have more time to bash and race because you will spend less time on this forum trying to tune the changes out of the motor. Get out there and enjoy the thing!!!! :2cents:
 
Good point .21rc10gt. In fact, I forgot to add this to my post, but I added the 2.5R Powertune head as used on the Revo to my T-Maxx 2.5 engine PRIOR to my breaking it in. I should have no issues with tuning this way, and so far I have not had any, as expected.
 
.21Rc10GT said:
The trx 2.5 needs a better cooling head.
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That is an absolute FACT. Any time someone shows up at the track and is sent to me to get it tuned, I'll tell them I'll make it run for the day, but I won't touch it again unless they change the head.
The Revo has a very efficient cooling head, and does not have the constant tuning issues that the stock 2.5 has. Revos seem to break in and run. Tmaxxs are constantly getting stubborn. I can't believe Traxxas hasn't put better heads on them yet. They're getting a bad rep, and it's all because of the poor head.
 
So by changing the head on the T-Maxx, the engine needs to be retuned from teh beginning???
 
baldie:

NO!

What a better cooling head does is KEEP it in tune better. I decided to add the Powertune head as used by Traxxas on the Revo before I broke it in so all the metals would break in at the same time and rate during the heat cycle of the Traxxas break-in schedule. Adding a better head later will only improve the running of the engine, and if any new tuning is needed it will be to maybe lean it a tiny bit as if it is running cooler, then it will be richer. By no means do I suggest leaning it just because you have a better cooling head. Head temp readingsa should be taken and reviewed first. And any further leaner settings should be done with the HSN.
 
Well if the temp is perfectly set with the stock head, then I upgrade the cooling head and it should bring the temp down a bit, so wouldnt I need to raise the temp using the HSN?
 

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