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Revo Just Dies??

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elmoredarren1

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Ok, my revo is about 7 months old and was running pretty good then last night was running it and it wont shift into second, and it seems to just die and then wont start till i let it sit for about 2-3 min. but it is not running hot temp is around 200-230 but just can't figure it out. i checked the airfilter it is fine even took it out to see if it would shift and would not.
thank guys for your help if you can....
darren
 
have you checked your fuel lines and try sealing your engine with some sealant, sounds like an air leak.
 
If it won't start hot and you have to let it sit it really sounds like your mill is on it's last legs. How's the compression feel? Is the flywheel easy to turn by hand? By not shifting it really sounds like it's not making enough power to get the RPM's up to make the shift.
 
well i had this happen on my revo and found out it wasn't the motor it was the 2nd gear clutch inside the tranny the end of the finger gets flatend out and it stops it from shifting causeing the motor to over rev and then it shuts down(never had the prob with starting though) it happend to me when i was racing and i tried everything and nothing worked so i bought a replacment one from traxxas and then it started working fine no probs hope this helps
 
SuperMaxx83 said:
well i had this happen on my revo and found out it wasn't the motor it was the 2nd gear clutch inside the tranny the end of the finger gets flatend out and it stops it from shifting causeing the motor to over rev and then it shuts down(never had the prob with starting though) it happend to me when i was racing and i tried everything and nothing worked so i bought a replacment one from traxxas and then it started working fine no probs hope this helps
Click to expand...

It was shutting down cause it was overheating from over revving.
 
elmoredarren1 said:
Ok, my revo is about 7 months old and was running pretty good then last night was running it and it wont shift into second, and it seems to just die and then wont start till i let it sit for about 2-3 min. but it is not running hot temp is around 200-230 but just can't figure it out.
Click to expand...

Well it may sound *** but I would make sure the batteries are charged. I had this happen once when I didn't have a fully charged pack receiver pack. The truck would never get out of first gear and died as well. You never know but I always check the simple stuff first now days.


Best of luck
Ray
 
well what is a clutchbell and where is the second gear to see if it is flat and what would i seal it with... engine has good compression.

thanks guys
darren
very new to this
 
The clutchbell is located at the end of the shaft for your engine it has the teeth on it and engages the spur gear. Two second gear is inside the transmission. I'd suggest going to the Revo Resources section at Traxxas and downloading the exploded views to familiarize yourself with the different components. When I asked if it had good compression I meant when the engine was hot. Many engines will feel "tight" cold but once they warm up they are loose as a goose. Get it warm and see how easy the flywheel is to turn by hand. I'm not knockin' and don't take this the wrong way but asking the questions you asked about the cb and the second gear location, I'm not sure your too familiar with what is considered good compression and a mill that is just barely hanging on. Please don't take that the wrong way.

BTW, there's a couple of guy here from your neck of the woods, RushRC being one. There's also a great track in Richardson - SpeedRacer Hobbies, you may want to check it out. There's some really nice guys that run there and Traxxas folks are there quite a bit.
 
Good info, Jet.

The Traxxas site if used correctly has a huge amount of info. Skip the forum however. Use the parts diagram to figure this stuff out and you can't go wrong.
 
Just out of curiosity, is it the stock 2.5 mill on it? Do you have an estimate as to how much fuel as been through it (i.e. gallon, twenty tanks, etc.)

Just trying to get an idea as to how much usage is on the mill.

SuperMaxx83, thanks for that tip, man. I'll have to keep that one in mind. Were you running the standard ratio gears in it?
 
Well heck, now my Revo is doing the same thing :ponder2: The temp would hang around 220 degrees but the truck would die like crazy. It would always take a few minutes before starting back up. I figured this was from the fuel boiling away in the carb. Also the truck would reach second gear when it stayed on long enough that is. Anyways, how do you check for air leaks
 
First look under the cap of your fuel tank, the blue o-rings are notorious for taking a crap! After that check your lines and exhaust coupler. From there WD-40. Spray it on one area at a time with the engine running and if it dies, there's your leak. Start at the carb base, then backplate or adapter where your eazy fart mounts up (I think you still have one right?) and go from there.
 
Well I've hosed the truck down and it didn't die. The tank lid seal looks pretty good as well. It's a mystery for sure and I'm not sure where to go next.
 
I have found that my 2.5R likes to run really well, around 270-280, if I run any richer to cool it down, it tends to load up and die.....Traxxas also says that if you run it too rich it won't shift, i would assume because rpms won't get high enough(like when it is cold). I am on my fourth gallon through it, and I have read on here that over time as you put more fuel through the engine it will need to gradually leaned out as compression decreases.

After all this I would say try to lean it out just a bit maybe up to 250 degrees.
 
I'll give it a shot tomorrow if I get some time. The truck has about a gallon to a gallon and a half run through it. I'm also wondering if the clutch behind the CB is slipping/needs replacing?
 
Well in light of what gregs78cam's post, I'm going to double check the mixture. It just got me thinking that the truck bogs when I floor it and then dies. Well, if the truck is lean, it dies once you floor it right? So I'm going to set the HSN at something like 3 1/2 - 4 turns instead of the 4 1/2 turns. I mean the motor has had a gallon or more run through it, so maybe I need to set it a little leaner. Now if this doesn't work, I'll need to now how to check the slipper and the CB clutch? I just got to wait for the batteries to charger for me to check her out :opps:


Thanks for the help/support guys
Ray
 
You're at 4 1/2 turns on your HSN now? That's a little fat (rich) for a broken in mill. Get your HSN set and then run for a little and check your LSN (do the pinch test). Good baseline slipped would be full tight and then back it off about 1/4 turn, maybe a little less.
 

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