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t maxx problems pls Help!!!

Old 03-17-2009, 08:25 PM
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Ckysmith2011
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Default t maxx problems pls Help!!!

I have a t-maxx 2.5 and i have been havin some serious problems with it. For some reason whenever i run it it will run for bout 5 min then stall out. I try to restart it and nothin,then like 10 min later it starts right back up and i will be able to run it again for like 5 min then boom stalled again.I have tried just bout everythin like takin apart the carb and cleaning it and makin sure there r no leaks but it still stalls.So i was thinkin that maybe it had somethin to do with the piston and but idk for sure. So plz help me out.
Old 03-17-2009, 08:28 PM
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superd09
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Default RE: t maxx problems pls Help!!!

sounds like it getting to hot. or it might need a rebuild. I had a truck run awesome for about 5-10 min then quit and I would have to let it cool down then it would start again.
Old 03-17-2009, 08:28 PM
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DaveG55
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Default RE: t maxx problems pls Help!!!

Classic symptoms of a worn piston/sleeve.
Not saying it couldn't be something else but with the little bit of info you gave, that's the first thing that came to mind.
Old 03-17-2009, 08:40 PM
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Ckysmith2011
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Default RE: t maxx problems pls Help!!!

OK guys thanx ill check out the piston/sleeve but how much do u think it will cost to replace it?
Old 03-17-2009, 08:51 PM
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superd09
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Default RE: t maxx problems pls Help!!!

get one off ebay for around 40 bucks
Old 03-17-2009, 09:02 PM
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DaveG55
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Default RE: t maxx problems pls Help!!!

I wouldn't bother replacing the p/s. If the engine is that worn then it likely has wear in other areas. You can replace the entire engine using Traxxas' ERP for $100 - $120 (don't remember exactly) and get a completely new engine complete with a new pull start and a full warranty.
Old 03-17-2009, 09:20 PM
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matts6887
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Default RE: t maxx problems pls Help!!!


ORIGINAL: Ckysmith2011

I have a t-maxx 2.5 and i have been havin some serious problems with it. For some reason whenever i run it it will run for bout 5 min then stall out. I try to restart it and nothin,then like 10 min later it starts right back up and i will be able to run it again for like 5 min then boom stalled again.I have tried just bout everythin like takin apart the carb and cleaning it and makin sure there r no leaks but it still stalls.So i was thinkin that maybe it had somethin to do with the piston and but idk for sure. So plz help me out.
Does in fact sound like the piston/sleeve/rod have taken a dump or are starting to be on their way out
Old 03-17-2009, 10:38 PM
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Montana Mike
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Default RE: t maxx problems pls Help!!!

More than likely you either need a pinch or a new piston/ sleeve set. Is there good snappy compression when you turn the flywheel by hand?
Old 03-18-2009, 02:18 PM
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Brandon_NC
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Default RE: t maxx problems pls Help!!!

If you are unsure I would recommend the replacement program that DaveG55 suggested. I just rebuilt a 3.3 on a TMaxx that I picked up for $75..... Based on the amount of time I spent rebuilding it.... It would have worked better to go with the replacement. But I enjoyed learning the ins and outs of the trx 3.3.

[link=http://www.traxxas.com/products/nitro/erp/trx_erp.htm]TRAXXAS ERP[/link]

COST

Any TRX® engine for new TRX 3.3 with pull starter
$110 plus $5.00 shipping & handling

TRX® 2.5R for new TRX 2.5R with pull starter
$85 plus $5.00 shipping and handling
-
TRX® 2.5 for new TRX 2.5R with pull starter
$85 plus $5.00 shipping and handling
-
TRX ®Pro.15 for new TRX 2.5R with pull starter
$85 plus $5.00 shipping and handling
Old 03-18-2009, 02:43 PM
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Ckysmith2011
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Default RE: t maxx problems pls Help!!!

cool guys thanx and my t maxx is electric start btw. Ill have to get out my tool set and take it apart and check it out.
Old 03-18-2009, 05:46 PM
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DaveG55
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Default RE: t maxx problems pls Help!!!


ORIGINAL: Ckysmith2011

my t maxx is electric start btw.
They all are unless someone has converted them to some other method. The ERP program comes with a pull strat but if you don't want to use it then it is easily replaced with your current starting system. Pull starts are worth between $15 & $20 and are good to have in the tool box as back-up incase the ez-start dies. Also, some people prefer pull starts over other methods but if you are not a good tuner a PS can be a royal pita.
Old 03-18-2009, 08:09 PM
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Ckysmith2011
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Default RE: t maxx problems pls Help!!!

ok well how easy is it to take off a pull start and put on the ez start. cause i have messed iwht pull starts and the metal coil thats inside of it always gets messed up
Old 03-18-2009, 08:31 PM
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DaveG55
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Default RE: t maxx problems pls Help!!!

4 screws removes either from the back of the engine
Here's a rebuild guide that shows how to take the ez-start part off - and a whole kot more

http://www.traxxas.com/support/kb_se...3&highlight=93
Old 03-18-2009, 08:37 PM
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Ckysmith2011
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Default RE: t maxx problems pls Help!!!

ok tyvm that seems pretty simple.
Old 03-18-2009, 09:31 PM
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Default RE: t maxx problems pls Help!!!

It is simple; not very hard at all. Just follow the diagrams and u should be good to go!!
Old 03-18-2009, 11:53 PM
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matt25
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Default RE: t maxx problems pls Help!!!

lol my t-maxx is doin the same thing and it is a work piston and sleeve but imma run it til it blows and replace it wit the os 21 or the 3.3 not sure which is better any opinions..
Old 03-19-2009, 09:50 AM
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DaveG55
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Default RE: t maxx problems pls Help!!!

The OS is probably the better engine. But that's based on owning several OS engine and not any experience with the .21TM. However, the .21TM is around twice the cost of the 3.3 and I'm not convinced that it's twice the motor of the 3.3.

So, between those two, if cost is a consideration go for the 3.3. If you're not worried about spending $$$ then go for the OS.
My next motor won't be either of those though, I think my next one will either be the RB 523 or the Pico .26.
Old 03-19-2009, 12:59 PM
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Gullwing72
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Default RE: t maxx problems pls Help!!!

The OS 21TM is based off the 18TM, in fact they share alot of the same parts. If the 21 is half as good as the 18 it is a dream to own and operate. I have had several trucks with the 18 and it has plenty of power, and minimal tuning I haven't touched a needle on mine in a month and I run it just about everyday. I have a brand new one still in the box just so I have a spare when this one finally blows. I have 6+ gallons through my current and it still has good compression and never lets me down. I would go with the OS..........
Old 03-19-2009, 06:03 PM
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DaveG55
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Default RE: t maxx problems pls Help!!!

I love my .18 TM too, great engine as are all the other OS engines I've owned. The thing is, I think OS screwed all their loyal fans over when they came out with the .21 TM and dumped the .18 TM. IMHO, the only reason they discontinued the .18 TM was because they decided to try to force people into spending twice as much for an engine that does not provide twice the benifit. Again, IMO, there's more than enough room in the OS line-up for both the .18 and the .21 but now instead of having the choice between a really good $150 motor and a bigger, more expensive one you have to buy one that's $300.
So, while I still like OS engines, I will never buy a .21TM. Especially when there are many quality engines with equal or more power for substantially less money.
Old 03-19-2009, 07:04 PM
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Ckysmith2011
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Default RE: t maxx problems pls Help!!!

hey guys i just took a aprt my motor and was lookin at the piston and sleeve but wat exactly shoulw i be lookin for?
Old 03-19-2009, 07:24 PM
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Default RE: t maxx problems pls Help!!!

Put the piston into the sleeve and see how far up you can push it. It should stop about 1/8" from the top of the sleeve. If it's much closer, even or goes through then it's done for. Obviously, the farther into the sleev the more wear but optimum is 1/8" or more from the top. Also check for scratches on the sleeve walls/piston. And/or and knicks or breakages in the piston skirt or sleeve ports. The color if the piston top can also tell you a lot about how the engines been running.
Old 03-19-2009, 07:39 PM
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Ckysmith2011
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Default RE: t maxx problems pls Help!!!

Oh ok i was checkin for scrathces and knicks but i didnt know if there was somethin else. and ill try that thanx again
Old 03-23-2009, 07:56 PM
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Ckysmith2011
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Default RE: t maxx problems pls Help!!!

Hey i was just thinkin bout the 3.3 for my t maxx and if is switch from a 2.5r to a 3.3 do i need to change anythin?
Old 03-23-2009, 09:26 PM
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Default RE: t maxx problems pls Help!!!


ORIGINAL: DaveG55


ORIGINAL: Ckysmith2011

my t maxx is electric start btw.
They all are unless someone has converted them to some other method. The ERP program comes with a pull strat but if you don't want to use it then it is easily replaced with your current starting system. Pull starts are worth between $15 & $20 and are good to have in the tool box as back-up incase the ez-start dies. Also, some people prefer pull starts over other methods but if you are not a good tuner a PS can be a royal pita.
I definitely agree with Dave here on the pullstarts CAN be a real pita if the engine isnt tuned properly. I can attest to that as Ive had pullstarts before and they were a royal pain in the u know what...so i can attest for sure to what Dave mentioned....
Old 03-24-2009, 01:34 AM
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Default RE: t maxx problems pls Help!!!


ORIGINAL: Ckysmith2011

Oh ok i was checkin for scrathces and knicks but i didnt know if there was somethin else. and ill try that thanx again


Pinch tests should really be done with the motor together. You should be able to spin the flywheel with your finger and hear it "pop". Should have some decent resistence also.


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