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trx2.5 PROBLEMS

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Old 06-22-2003, 12:05 PM
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ptimer
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can any1 help me my tmax is doing my head in,ive had it now for just over a week the problem started when i tried starting it about 4 days ago,i had it out the day b4 then and it was working fine so when i whent to start it it wouldent start i noticed a cut in the fuel line and replaced it but to no avail then i checked most things out like fuel line filters and kinks,still wouldent start so i left it at that,later on that day i took it apart cleaned it and whent to put it back together but was a bit baffled as to how the piston whent into the sleeve, does the side with the bit cut out face the front or back ov the engine,after further inspection i come to the conclusion it goes to the back becouse it fitted better.anyway i posted a message last night asking which way it faced,a nice chap replied and told me it whent faceing the clutch so i put it in facing that way and put it all back together and when i started it today it ran ok but over heated very quickly ive got the mixture needle set to factory settings,can any 1 try and help me out i would be very happy for any suggestions .thanks
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Old 06-22-2003, 03:15 PM
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someone must have some info for me,ive been out on the back with it b4 and it cuts out and is hard to get started and when it cools down a bit it starts again,ive checked the glowplug and its ok
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Old 06-22-2003, 05:17 PM
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It sounds like you have an air leak somewhere. I have been told by Traxxas and other that if your carb has the two o-ring set up that whenever you remove your carb you need to replace the lower o-ring. I just rebuilt my engine after a good cleaning and I used some RTV to seal up everything. RTV is a silicon based gasket maker. It comes out in liquid form and basically makes a rubber/silicon gasket when it dries. I put this around the backplate of my engine, along with around the carb. Just take a little of the RTV smear it where you want the seal and put it back together. It needs to dry for about 24 hrs but after that you should be good to go.

So here is what I would do. Go get some RTV from a local auto parts store, while you are out get yourself a new o-ring for the carb. Take the easy start off and then the backplate. Put a little RTV around the backplate o-ring and seal that up. Try not to get too much on there so the RTV does not get in the way of the internal parts. Also thread lock the screw for the backplate. Then remove your carb, replace the lower o-ring. Once again put a little RTV around the carb and slide it back in. Be careful when you do this so you don't tear the new o-ring you just put in. Also remove the cooling head and make sure the shim is seated correctly. When you tighten it down go in a star pattern, tighten them slowly. Get a little tighter each time. The cooling head is also another place you can have a leak.

I hope this helps. I went through pretty much the same thing you did a while ago. It turned out to be my carb o-ring was bad. It basically was shaved in half. Good luck, and come back if you need any more help.....
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Old 06-25-2003, 09:44 PM
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Schuby1982
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I wanted to let you know that I bought a new t-maxx and after less then half a gallon of fuel it continued to overheat. I called up traxxas and asked them what to do. Remind you this is less then a week after i bought it new. I tried everything, so they said send the engine in it is under a 30 day warranty. Well guesss what that engine less then a week old was worn out already. I asked them why and they said sometimes these engines just aren't made right out of the factory. They replaced my engine for free all I had to do was ship it to them. If you have anymore question for me e-mail me at Schuby1982@yahoo.com
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