Steem 2000

I own a t-maxx 2.5 and i really like the engine on it but about a month ago the engine started to play up. It kept stalling so i thought that the piston had wornen out since it has had quite a lot of running. So i changed the piston and sleeve and also brought a new cooling head for it. As i started trying to run the engine in, it started to get the same peoblems as it did before i replased the piston. Its got so bad now that as soon as i take the glow stick off the engine stalls. If i leave the glow stick on for about 2 minits i can get the engine to run for about a minit befor it cuts out. I have tryed different fule and different tuning setting but there was no change. I have also taken the engine and carb apart again but i could find nothing wrong with it. I have been in this hobby now for about 5 years so i no these are not just "brake in pains". I think it might be down to loss of compression but i cant work out why because i have changed all these parts: Cooling head, Glow plug and gasket, Head gasket, piston and sleeve, the fule i have been using.
Somebody please help me with this problem its driving me MAD[:@] !!!!!!!!!

tommythecat

My Feedback: (2)

I assume you've already reset the carb to factory settings.

Have you tried turning the idle up?

Have you tried leaning the LSN a tad?

stilllost

My Feedback: (3)

you didn't mention replacing the glow plug

tommythecat

My Feedback: (2)

He said he did that already

stilllost

My Feedback: (3)

oops kind of got that symptom though but leaving the glow stick on for that long isn't good. maybe you didn't get a good seal on the back plate? maybe bad fuel? you know it is getting hummid outside. fuel filter cloged? bad o-ring on fuel tank? hmmmmmmmmm

BaSh_2_tHa_mAxX

My Feedback: (1)

Fill your tank to half way then start up at half throttle hold throttle till it gets warm and then re tune.

Steem 2000

Thanks Ill try that

P.S what is the OS engine like in your t-maxx is it as power full as the Trx2.5?

BaSh_2_tHa_mAxX

My Feedback: (1)

^ I take it your talking to me.... well i have an os 18 cv-rx plenty powerful it will wheelie on command and blow away any 2.5 t-maxx

hotchi1

ea it a great motor

baddman

i know whats wrong for sure i just had the same thing happen..

your one way bearing on the rear crank shaft for the starter is frozzen up.

it trys to start some but will not run and you spend all day trying everything you can tink of but nothing helps....................it sucks huh.........lol

THE FIX..............

just remove the backing plate with the starter motor on it and clean the bearing with brake cleaner and put some 30wt motor oil on the one way then spin it a few times and reinstall.
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also sometimes the bearing will not grab the shaft and it just spins and will not start . just do the samething and it will be fine.
the bearing is just picky....


we talked to traxxas and they said the same thing .........
hope this helps
baddman

Steem 2000

Thanks ill try that

baddman

tell me how it worked for ya.

Steem 2000

It works now! Thanks you saved me a lot of money cos i was geting so enoyed with it i was going to get the OS 18

baddman

HEY WHAT CAN I SAY ...........IM GOO HUH

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