revo still wont start

[slat26]

well i had a bad oneway bearing and just got the replacement in, i resett to all factory settings and put a fresh pllug in. it idles fine but as soon as i press the throttle it seems to bog down and stall. i leaned upthe HSN 1/16 at a time untill about 1/2 a turn. i have tried giving it a little throttle when starting but it only bogs and stalls immediately, what do i do,

i am nearly ready to drop the hobby because all it is causing is stress and anxiety because i feel i haave wasted well over $500 on this

[fezzy]

OK, So you leaned the high-speed needle to stop it from stalling when you accelerated? Well leaning the high-speed will help stop that, But really you want to be adjusting the low-speed to stop that from happening. Here is what to do, Re-Set the needles again, Fire it up and give it some rev's to get the heat up, After a few seconds put it down and drive off slowly, If you are unable to drive off and it bogs down and stalls lean the bottom end 1/4 of a turn and try again.

What number tank are you on now?.

[slat26]

6 tanks total
i cant even get it to rev, as soon as i touch the thottle it seems to "bog" and stall.
yes i leaned it 1/16 turn at a time till i reached a half turn total, everytime i leaned it the idle sounded better and it started easier, should i richen it up a little bit?

thanks for the help, i will try it this evening cuz i must go to school. this is my first nitro, so i am a newb. thanks again

[sinister]

mabey cause its a traxxas :rolleyes:

[-=ADA$=-]

i would say so, i thought same thing about traxxas but ive seen revo personnaly and it seems to have enaugh power to move with authority. And try leaning LSN until you can rev it, i know your supposed to tune HSN first but if you cant rev it, than tune LSN as much as its needed to rev properly

[doubleh]

have you flushed out the tank and hsn?if not do so(lessoned learned the hard way (dont ask )

[savageman12]

6 tanks through it? have you replaced the connecting rod (its going to go soon if you haven't), and its probably time to replace your piston and sleeve. after i did that on my evader (POS truck) it solved that problem, as well as on my tmaxx

[savageman12]

never mind, i didn't mean that....stupid me..for some reason i thought you meant 6 gallons :rolleyes: :confused: :o

my bad...sorry, i can't help you with your problem

[sinister]

i am nearly ready to drop the hobby because all it is causing is stress and anxiety because i feel i haave wasted well over $500 on thisDont do that over the 2.5r that is just a fincky motor to tunethat truck would rip if you put another motor in it

There are a ton of company's that make drop in replacements for the traxxas motors
Epic
Fantom
Ofna
Picco
Peak Performance
Team Orion
Sirio

or find someone in your local area i'm sure someone will help you thats whats great about this hobby most people are willing to lend a hand and teach i wouldnt know anything really had the guys at the local track been willing to teach all you have to do is ask

[imrez55]

i agree with sinister, the 2.5 is not easy to tune, n u will have to make a few ajustment everytime u run it (if u live in a place where the wheather changes every couple of seconds, cleveland) it may b a little hard for a newb but once u get the hang of it u'll b fine

[slat26]

well, i leaned the LSN and it reved once then stalled. everytime i tried to start it since it stops as soon as the e-z start stops. it has the same symptoms as it did when i "thought" i blew the one-way bearing out. but i took the bearing out and it works fine.

the first time i had trouble the guy from traxxas said it was the 1 way bearig when i took it out i didnt know what it was supposed to do, (i thought that the silver inner section spun one way inside the black outer part) when i recieved the new part i was dumb and didnt compare the new ad old bearigs. thats the piont i was at when i started this thread.

now i am back to the beginning something i thought was fixed was never fixed, so i am clueless, because a truck should start at factory settings. shouldn't it?

i also feel for $500 a truck should run with its stock engine, the last thing i want to do is spen $200 to $300 on another engine.

someone please help me

[redheat8]

I'm thinking that you have something in the carb. that is causing your truck to act up , If I had the truck in my hands I would pull the carb. and clean it, replace and use a new seal that fits on the base of the carb. and manifold put silicone around the base to prevent air leaks prime and start, Believe me I have 3 ,2.5 engines that I use with my 2 Maxxes and they can be a pain to adjust at times, RED

[RCMadMatt]

Not to be mean, but I think you should sell the nitro and get an electric truck. I have read that you are new to the hobby, or maybe just to the nitro scene, so it's just a suggestion. Where did you buy the Revo? Is there a shop or track you can go to for help? Racers are always willing to lend a hand when there is a problem. If not, sell the nitro and go electric, although there has to be someone who will "take you under their wing" and help in your area.

Matt

[fs454]

Everyone goes through the newbie to nitro stage one time or another....It just takes learning to get into the hobby, dont give up. I run a 2.5 in my t-maxx and the engine simply rips the hell out of anything that goes against it (Tied with my dad's Hyper 21 8 port maxx). It does need to be tuned a lot and is picky, but its great when it runs well.

I would ask your hobby shop to tune it up and get it running for you, read up on engine tuning, READ THE MANUAL, and ask any questions you have here. You'll get better at tuning and getting it to run well as time goes by.

[slat26]

ok thanks, unfortunately there is no track nearby and the lhs is not big on nitro, but i will go to the 2nd most local HS when i get some spare time.

there are so many factors and things that can go wrong i dont know where to start.

thanks for the help so far.

[kevinmcdade]

well i had a bad oneway bearing and just got the replacement in, i resett to all factory settings and put a fresh pllug in. it idles fine but as soon as i press the throttle it seems to bog down and stall. i leaned upthe HSN 1/16 at a time untill about 1/2 a turn. i have tried giving it a little throttle when starting but it only bogs and stalls immediately, what do i do,

i am nearly ready to drop the hobby because all it is causing is stress and anxiety because i feel i haave wasted well over $500 on this

Don't give up nitro R/C just give up the 2.5 engine.

[robc]

Well it seems all of the 2.5 naysayers have come out of the woodwork although most have probably never owned one. Great engine, probably not great for first timers or people who can't tune/troubleshoot a high performance engine. You would be better off going to traxxas.com's forum where people are willing to give good advice and where they have a 2.5 tuning guide. I have never had a temp issue with my 2.5 and other than sealing the carb body no other real problems. As fs454 said, properly tuned, the 2.5 will run with the big blocks. Don't give up!

[Avalanche]

Well it seems all of the 2.5 naysayers have come out of the woodwork although most have probably never owned one


The 2.5 is the worst engine ever made. Do yourself a favor, dump that POS and get yourself a Sirio 3.0. Its a true high-po engine thats built right and runs hard and strong. I dropped one in my brothers Tmaxx and its the best thing since sliced bread. Ive been into Nitro RC since the mid 80's and have tons of experience with everything from tether and free flight helicoptors to the latest off road MT technology and I can say without reservation the TRX 2.5 is a disaster. Ive seen more bad ones than good ones and traxxas agrees by the way they are warrantying them. Do what we did, junk the 2.5! Send ot to Traxxas for warranty, they will rebuild it and send it back, sell it on EBAY and put the money towards a real hi-po engine.

[kevinmcdade]

The 2.5 is the worst engine ever made. Do yourself a favor, dump that POS and get yourself a Sirio 3.0. Its a true high-po engine thats built right and runs hard and strong. I dropped one in my brothers Tmaxx and its the best thing since sliced bread. Ive been into Nitro RC since the mid 80's and have tons of experience with everything from tether and free flight helicoptors to the latest off road MT technology and I can say without reservation the TRX 2.5 is a disaster. Ive seen more bad ones than good ones and traxxas agrees by the way they are warrantying them. Do what we did, junk the 2.5! Send ot to Traxxas for warranty, they will rebuild it and send it back, sell it on EBAY and put the money towards a real hi-po engine.

Very well put!!! I agree with you 100%.

[slat26]

i dont appreciate you steering my post this way. i have the 2.5, and im not getting rid of it any time soon, i would appreciate you guys to help me fix what i got, not say its a POS and get something else. i have it, thats all there is to it.

i appreciate the fact that some people have respect for what somebody has, because some just DIS you and make you feel like crap and like you wasted your money. maybe it was a waste but i am going to make do with it and would appreciate help to fix this problem.

thanks to all those who have posted to help me, and please dont take this the wrong way for all those who have DISed the 2.5(i am a newb so therefore not an expert,) it just gets me POed when people say stuff like that, especailly when they have no evidence to back up their argument.


please keep this as a help thread, and not a big argument on which engine is better

[fezzy]

You are right to stick to your guns, Remember that mostly everyone will whine about something negative and those that have had positive experience generally wont document it. I have a 2.5R in my Revo and have had NO PROBLEMS at all, I am however an advanced hobbiest so I can spot whats a problem thats un-solveable and a problem that is solveable. I will also say however that I have 2 mates who I race with Revo's and 2.5R's, Only one has had trouble with his and that was with the one-way bearing sticking, Abit of nitro cleaner later and he was rolling once more.

Contact Traxxas again, Tell them your not happy and that you would like some help with the engine, Ask if you can send it in and have them look at it, They may well charge you for postage but at least you have piece of mind. Alternatively seek out a LHS, If you go to one that you have not purchased from before explain to them that the only reason you have come to them is that the LHS you purchased your Revo from is incompetent, They would be stupid to turn your custom down!.

Good luck, And stick at it.. Ignore these numptys :p.

[thedominator]

The 2.5 is the worst engine ever made. Do yourself a favor, dump that POS and get yourself a Sirio 3.0. Its a true high-po engine thats built right and runs hard and strong. I dropped one in my brothers Tmaxx and its the best thing since sliced bread. Ive been into Nitro RC since the mid 80's and have tons of experience with everything from tether and free flight helicoptors to the latest off road MT technology and I can say without reservation the TRX 2.5 is a disaster. Ive seen more bad ones than good ones and traxxas agrees by the way they are warrantying them. Do what we did, junk the 2.5! Send ot to Traxxas for warranty, they will rebuild it and send it back, sell it on EBAY and put the money towards a real hi-po engine.

lol :p my 2.5r is awesome. 220 temps and this thing screams. Also many people at my track run the 2.5 in various cars such as the 4-tec, rustler, and t-maxx and i have not seen any problems with the engine other than poeple not knowing how to tune. From my experience it is a good engine. I think people have a hard time with it because you usually have to mess with the lsn. After break in mine would cut out when decellerating. i leaned the lsn out some and now it runs like a champ. :D

[fs454]

The 2.5 screams, but it's not too fun for a beginner as it's fairly hard to tune. Try finding someone that will show you in person how to tune it, and get it running.

[awnelson]

If you are looking to have a backyard basher rather than race, the first thing I would do is put a head shim on the motor to reduce compression and engine temps, put in 20% nitro fuel (if fuel sits on a concrete floor, it will absorb water from the concrete through the plastic bottle, so make sure it is consistently fresh and stored away from sunlight on wood or cardboard), buy a glow ignitor (preferably with a meter that tells if you are heating the plug built into the ignitor) that doesn't run off the ez-start (it allows you to run without cranking the starter). Get the engine up to temperature on a fresh plug (Traxxas or Dynamite; used plugs fuse or burn metal particles to the coil internally and won't allow the plug to reach or maintain operating temperature effectively) and see if you can get the engine to accelerate with the glow ignitor attached. If so, try to remove it and see how long at idle it will run. If it dies immediately, check your carburetor opening at idle and make sure there isn't too much gap. The engine should be able to run on the low speed needle set correctly (flush with the outside of the carburetor body) even with the high speed needle closed completely. Otherwise, if the motor idles correctly, don't worry about transition from idle; what you are looking for now is that the engine will open up and run even at mid-throttle. Your engine temp should be warm at least before you try and accelerate it. If you can accelerate the motor slowly with the throttle trim on the radio rather than the trigger you will have better results, just don't forget to reduce the trim after it is running well. Try to speed up and then go through the recommended proceedure for setting the high and then low needles from Traxxas. There is also the DVD which I would suspect most haven't looked at anyway. You will always have issues with any motor if it is your first; don't let the other posters here con you into a more expensive, more finicky motor just because they can't tune this motor. Out of the box the 2.5r has many advantages that the 2.5 didn't even have, it just needs care to be taken to ensure motor longevity and performance. Let me know if this helps at all.

[redheat8]

Well any luck getting your engine fired up and running yet I still feel that the problem is that the carb. hasa flow restriction problem wether it be in the inlet or needle setting and seals , RED

[slat26]

thanks for your support. how do i flush out the carb, and fuel tank CORRECTLY.

[redheat8]

first remove the carb. from the engine, Now what I do is remove everything from the carb. body and spray rc motor cleaner threw the carb. body,clean the carb. parts and replace the seals with new ones use o2 sealer around the base of the carb. and manifold, now if you would rather just remove the carb. and spray cleaner threw the fuel inlet with the needles out that might work, if you have a air compressor use it to , as far as the tank goes I would remove it and flush it with some fuel and blow the fuel line with air, If your not using a in line fuel filter I would consider getting one and if this happens again the stuff well end up in the filter not the carb. I have 3, 2.5 engines that I use on 2 of my Maxxes and I have had problems in the past with the carb. they are extremely sensitive to small particles of dirt and metal pieces or shavings that I think might be causing you some problems, RED

[Avalanche]

i dont appreciate you steering my post this way. i have the 2.5, and im not getting rid of it any time soon, i would appreciate you guys to help me fix what i got, not say its a POS and get something else. i have it, thats all there is to it.




You came to a discussion board for advice, and thats what you got. You cant take it or leave it. As evidenced by the posts here there are people who got lucky w/ the TRX and some that didnt. If you didnt, you can sink all the money and time into it you want and not ever be happy. I can tell you have seen many bad ones, including ours!! If all you are looking for is a "love fest" and blind faith for the 2.5, you can go to the traxxas boards. For honest "man on the street" type of info, this board is the place to be.

[thedarkness]

Sounds dumb but check the fuel inlet and make sure the hole in it lines up with the one on the hsn

[Johnny Ringo]

Slat give us a call at 888-TRAXXAS chances are we can figure out what the problem is right over the phone. If you would like you can ask for me directly and I'll be happy to walk you through some troubleshooting steps.

BTW don't worry about the naysayers about the 2.5 they are just people you'll be passing at the track in the near future! :)

JR

[kevinmcdade]

BTW don't worry about the naysayers about the 2.5 they are just people you'll be passing at the track in the near future! :)

JR

NOT!!! Hadn't happened yet and I don't see it happening in the future. I don't even recall seeing one in the A-Main...they always end up with big DNS or DNF...

[robc]

I don't know Mr. "new member", at our track the other weekend 2 Revos ruled the monster truck class, which included many hopped up big block powered trucks. Depends on the track and more importantly the driver. Traxxas still has the best customer support in the business, as evidenced by one of their reps on this thread.

[slat26]

i took apart the carb and cleaned it out, cleaned the fuel tank and lines too, and put a fresh med. plug in. started up on a dime, so it was any of those problems. called traxxas and walked me through the cleaning procedure. THEY ARE WONDERFUL!

i am going to get a hot plug because the temps are getting up above 270 and the thing is richer then factory setting with body off.

any tips to bring down temps?

[sinister]

what % of fuel are you running

[fs454]

The only way i could get my 2.5 to cool down is to get a new cooling head. Golden Horizons makes a good one.

270-290 are fine for the engine, though some say, like traxxas, not to bring it over 270. Dremel small holes out of the windshield on the body, so there is lots of airflow to the engine. Then the temps with the body on and off will basically be the same.

[Avalanche]

i took apart the carb and cleaned it out, cleaned the fuel tank and lines too, and put a fresh med. plug in. started up on a dime, so it was any of those problems. called traxxas and walked me through the cleaning procedure. THEY ARE WONDERFUL!

i am going to get a hot plug because the temps are getting up above 270 and the thing is richer then factory setting with body off.

any tips to bring down temps?



You should probably take the engine apart and seal everything up with the red silicone gasket maker, the carb neck, backplate, new glow plug washer, check for air leaks at the fuel inlet banjo fitting, and head shims. Do a search on sealing and engine and you'll find procedures. Dont run it to hot, 270 with the body off is way to hot. With the body on and running hard you'll fry it. If sealing it up and retuning it doesnt work, send it back to Traxxas.

[slat26]

20% fuel is what i am using.

is their any way to test for air leaks? without taking the whole engine apart and resealing everything?

[Avalanche]

20% fuel is what i am using.

is their any way to test for air leaks? without taking the whole engine apart and resealing everything?


Unfortunately not, sometimes you can spray a little penetrating oil around the engine while its running and listening for any change in the way the engine runs, that would indicate a leak in that area. Once you get the engine apart you maight be able to see dark "tracking" marks where the air leak is, it sounds like your engine is to new to have those marks yet. Its usually good practice to seal any engine right off the bat, even new right out of the box. I had new Force 25 engine leak from every orafice right out of the box, after sealing it up it was like a completely different engine.

As far as putting a bigger cooling head on it, you need to have your engine running right BEFORE putting a bigger cooling head on it or else all you are doing is masking a problem, kind of like turning the radio up in your car to drown out a noise the car is making.

[slat26]

kind of like turning the radio up in your car to drown out a noise the car is making.

i like that example, thats a good one, as for sealing i will bring it to my hobby shop and have them do it because i am not to sure, after watching thm i will do it myself in the future.