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Revo 3.3 new engine 1st start

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HDRIDER56

HDRIDER56

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Has anyone else had issues with their initial startup with their Revo 3.3 or any other Traxxas Nitro? Trying to do my break in running, EZ start will not rotate the motor past TDC, glow plug out, engine has been stored with lub in it soon as I got. I can rotate by hand, so my question is why doesn't Traxxas include preheating the engine especially for the 1st start? What I'm getting ready to do now. I've had nothing but problems with their EZ start system, I've got new batteries, new motors new wire harnesses for both of my Nitros, Jato and Revo. About ready to switch to a pull start setup.
 
The motor will never be tighter than it is right now. Compression not likely to be much higher than it is now, new. That combined with the little tiny ez start motor that also isn't broken in, brushes not seated...
Its gonna take a few for things to start turning right.
As long as you don't have a binding issue, some broken piece in tge ez start system itself, I'd guess you're ok. It sounds like mine did when they were new.
Mine are also a Jato and Revo, both 3.3's. 😎

The ez start system isn't great but it works, at least until it breaks.
Most ppl end up replacing them with pull start eventually.

If Traxxas manuals don't mention preheating the engine, its because Traxxas wants to sell you another engine again, real soon. 😂🤷‍♀️
 
CertifiedMike said:
The motor will never be tighter than it is right now. Compression not likely to be much higher than it is now, new. That combined with the little tiny ez start motor that also isn't broken in, brushes not seated...
Its gonna take a few for things to start turning right.
As long as you don't have a binding issue, some broken piece in tge ez start system itself, I'd guess you're ok. It sounds like mine did when they were new.
Mine are also a Jato and Revo, both 3.3's. 😎

The ez start system isn't great but it works, at least until it breaks.
Most ppl end up replacing them with pull start eventually.

If Traxxas manuals don't mention preheating the engine, its because Traxxas wants to sell you another engine again, real soon. 😂🤷‍♀️
Click to expand...
The EZ start is broken in, I just switched from a 2.5 to the 3.3 engine, this was a project not running build. Upgraded the chassis to the extended chassis, new TQI Telemetry radio system, new shocks, steering system, just replaced all of the servos. Only original parts are the 2.5 trans and both differentials. I totally hear what you're saying, just a little frustrating. Traxxas needs to add the preheating to their break in running.
 
CertifiedMike said:
The motor will never be tighter than it is right now. Compression not likely to be much higher than it is now, new. That combined with the little tiny ez start motor that also isn't broken in, brushes not seated...
Its gonna take a few for things to start turning right.
As long as you don't have a binding issue, some broken piece in tge ez start system itself, I'd guess you're ok. It sounds like mine did when they were new.
Mine are also a Jato and Revo, both 3.3's. 😎

The ez start system isn't great but it works, at least until it breaks.
Most ppl end up replacing them with pull start eventually.

If Traxxas manuals don't mention preheating the engine, its because Traxxas wants to sell you another engine again, real soon. 😂🤷‍♀️
Click to expand...
Absolutely they do, I got tired of screwing with the carb on my Jato, switched to a OS11K carb months ago, haven't had a single issue with it since. It was already a rocket before, my street is too short to open full throttle more than a few seconds. Lol
 
I don't know for sure but I don't think there was a different ez start motor fir 2.5 vs 3.3.
The new, tight motor or maybe if the old ez start motor is a little too old is all I can think of.
Are your batteries good and strong for the ez?
Maybe try a new battery pack to see if a little more current or a lipo pack with a tiny bit higher voltage would help too.
It seems like you are where most ppl end up at with an EZ start system.

A pull starter isn't a bad thing. Frees up space, less weight. No wand to carry around... 😎

You coupd always try Jennysrc.com for a new ez start set up. Cheap enough to give a try I suppose.
I bet they have a 'buy one get 10' offer on them. 😂
 
CertifiedMike said:
I don't know for sure but I don't think there was a different ez start motor fir 2.5 vs 3.3.
The new, tight motor or maybe if the old ez start motor is a little too old is all I can think of.
Are your batteries good and strong for the ez?
Maybe try a new battery pack to see if a little more current or a lipo pack with a tiny bit higher voltage would help too.
It seems like you are where most ppl end up at with an EZ start system.

A pull starter isn't a bad thing. Frees up space, less weight. No wand to carry around... 😎

You coupd always try Jennysrc.com for a new ez start set up. Cheap enough to give a try I suppose.
I bet they have a 'buy one get 10' offer on them. 😂
Click to expand...
I just seen a video on YouTube showing the old and 2nd generation EZ start systems. I've got the current one on both of my Nitro.
I'll check them out, thanks
 
Well don't know what to make of this, look what i found when I pulled the carb. It was jammed inside the Crankshaft. Looks like a wheel nut fell inside.
Yeah this is bad!!!

20250714_183628.webp


20250714_183750.webp
 
CertifiedMike said:
Loose nut behind the (fly) wheel... it'll get you every time!!! 🙄🤣

How does it run with less nuts now? 👍
Click to expand...
Tearing it down now to check damage control. I might of gotten extremely lucky, the nut was aluminum, inside a hardened crankshaft. So far the bearings feel okay, the piston and sleeve still look new, my concern is the crankshaft and inside engine surfaces.
I'm never going to live this one down now am I? Lmao
Seriously what are the chances here that this was the exact size to slide down the inside of the crank and still be able to rotate the flywheel by hand and not bind up. 🤬🤬🤬 I think I invemt some new cuss words today
 
Y'all never gonna believe this one,
Had to clean up the crankshaft a little, clean out the shavings from that damn nut. Other then that no damage.
See attached video
Got to give it to traxxas and this 3.3 engine
 
HDRIDER56 said:
Y'all never gonna believe this one,
Had to clean up the crankshaft a little, clean out the shavings from that damn nut. Other then that no damage.
See attached video
Got to give it to traxxas and this 3.3 engine
Click to expand...
Thats... NUTS!!! 🤣

Congrats!!! Sounds just like a Traxxas for sure!!! 😎
 
easy rider said:
Man, I put the piston in backwards last one I tore down. Never done that before. It happens.

You got it purring now. Very nice idle.
Click to expand...
How did that work out for you? I came close a couple times in the beginning, doubled checked and sure nuff piston was backwards. Never ran one with it backwards.
 
HDRIDER56 said:
How did that work out for you? I came close a couple times in the beginning, doubled checked and sure nuff piston was backwards. Never ran one backwards.
Click to expand...
It won’t idle long enough to run. It looses pulse as it gets warmer and dies.

If you ever do it, it’ll fire right up once heat gunned. Idle for 20-30 seconds and dies. Then gets progressively worse the warmer the engine gets. You’ll know it if you do after about the third start. lol
 

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