T-maxx 3.3 hard to start when warm...

[Twist-g3.3]

Hi...I have a nearly 2 year old T-maxx 3.3... and after the first start it's really hard to start(when its warm)...any idea Why???

 

[Metalhead Matt]

Sure sign of over-heating. Or close to it. How many gallons are through the engine? Has it been sealed? What's the temps? A little more info will help us to pin-point your problem better.

 

[Twist-g3.3]

Temp is between 200 and 250...but i live in a very hot country...about 2 1/2 gallons trough the engine...

 

[Metalhead Matt]

It may just be getting worn out. Does it stay running good for you, or does it stall once it's up to temp?

 

[Twist-g3.3]

sometimes it stalls...last time i drove it it started, gave it some gas and it died instantly... the last fuel i used was hpi's fuel, because traxxas fuel wasn't available at the time...but now i have top fuel 33 %...

maybe the carburator is a little clogged up...i'll check that later...

 

[Metalhead Matt]

The 33% fuel may be causing you some problems. The combustion chamber is designed to run 20% from the factory. This is what the shim, between the head button and the cylinder is there for. A fine adjustment to the combustion chamber. These shims come in different thicknesses, and they have to be altered to run the higher nitro %. Your best bet would be to try some Byrons 20%. Best fuel most of us have used. How's your engine hold a tune? If your tune is erratic, you may have an air leak. But your temps aren't indicating it. An air leak is usually accompanied by high temps(300+). 200-250 is a little on the cool side in my experience with trx engines. I'd get some 20% fuel and shoot for the 270-280 range, with the temp dropping 1 degree every 4-5 seconds or so at idle.

 

[Twist-g3.3]

Okay...Thanks for the help...but at my local hobby shop(there is only one in my country) they now only have 33% top fuel and Backyard basher fuel... and when i used the Hpi fuel it the engine stalled more...thats why i bought the 33%