n19htmare

My Feedback: (1)

I dunno what it is, I checked for leaks and really can't figure it out.

Put in my new 3.3 and went to the break in. Right away I knew something was wrong because it was idling rather high (the idle gap is stock, about 1mm). HSN is 4 1/2 turns out from close and the LSN is at stock setting, A little bit out from flush.

it reached 250 deg on IDLE...... At 4 1/2 turns out, it should be spewing out oil at idle but nothing. no oil, it only spits out oil if i rev it a little.

The only thing that's old on it is the header and exhaust that I carried over from my 2.5... i couldn't find any leaks but there must be.... what can I do?

When I took it on the street, at 1/2 throttle it ran fine, plenty of smoke and i could tell it was running rich. But at full throttle, it screams and I know it's lean just from the sound it makes.

At 4 1/2 turns on HSN , past the flush on LSN, it's pulling wheelies...... There has to be a leak but WHERE!

By the way, break instructions are being from This thread by FuelMan 3-4 posts down. http://www.rcuniverse.com/forum/m_2786285/tm.htm

bmwnla

try richening the low speed

RenegadeRevo

My Feedback: (1)

Sounds like either an air leak (have you changed your fuel line??... how old is your fuel tank o-ring?) or what he said ^^

n19htmare

My Feedback: (1)

New Fuel lines....

Fuel tank is still the old one from 2.5 but the seal is TIGHT. I'm very positive that is not the issue but to be sure, I will retro-fit the Savage tank (which is brand new) onto the Tmaxx and see if that helps. Thanks for the idea.

Would a leak in the header area cause this? I looked my header over and it seems to be good but Maybe I am missing it so just wondering.... I thought if there was something amiss in the header area, that it would leak oil or smoke would come out but that area is CLEAN.

I think tomorrow I'm also gonna take the carb off and seal it with some high temp silicone.


Any other ideas?

RenegadeRevo

My Feedback: (1)

It would throw the tune off, yes... since the fuel runs on pressure from the exhaust, any pre-release of exhaust before it hits that pressure line would create the same type of symptoms as an airleak in the fuel system. I would think you'd see some signs of a leak.... unburnt oil, dust, something....

I've had one heck of a time with the fuel tank in my Revo. I decided to buy my own O-rings... and I get a REALLY tight seal (so tight I have to PUSH the lid closed... and it *POP*'s when I open it... ) However, if something gets screwed up on that seal, it throws everything off.

matts6887

Yes, if u have a leak in the exhaust/header area that u cant see, then yes that is something that could cause a unusually high idle and temps like u are experiencing. If ur fuel tank is the old one from ur old engine, I would still take it off, put it in a sink full of water and blow into either of the 2 fuel lines and check for hairlines cracks that u cant see. Also check the gasket(s)/o-ring(s) that sit under the carb, and on the backplate for possible nics and/or tears as that too will cause a leak.