TRX 2.5 tuning problem

[DirtRider045]

I have been tuning my new tmaxx for days now and i cannot seem to get that perfect tune. Whats giving me the most trouble is the Lsn, it seems that every time i drive it it changes drastically! The idle also seems to fluctuate uncontrolably. Any help would be great!

 

[cwal1774]

Search this forum for threads on tuning there are plenty of them on here with good info and helpful tips and dont worry so much about getting that "perfect tune". If your making good power and its not stalling out or creeping away then run with it you'll drive yourself crazy trying to get that "perfect tune". Here's one of those good tips for you a fluctuating idle means is a sign of overheating. Richen your hsn a little. Do a few high speed passes and bring the truck in. If the idle is still fluctuating or fast, richen the low speed needle till the idle comes down. Then do a few more high speed passes pay attention to the smoke trail you want a light trail of blue somke coming from the exhaust. Bring the truck in pinch the fuel line the idle should speed up for a few seconds and then die. If you get it to do that then your good to go.

 

[SMaxxin]

it seems that every time i drive it it changes drastically! The idle also seems to fluctuate uncontrolably. Any help would be great!

Your either running very lean or you have an air leak. Many things can cause a leak, search air leak and you will find tons of info on how to find it. Heres something to get you started

Sealing an engine....IMO every TRX engine needs this, even if it is new!
https://www.rcnitrotalk.com/forum/showthread.php?t=72487&highlight=air+leak

Other causes would be fuel lines, front crank bearing, fuel tank or tank lid o ring, head shims, cracked block.