Overheating Revo 280 degrees at idle

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bill.jenner@gmail.com - 08 Jan 2006 16:18 GMT

When breaking in this new motor, I followed Traxxas break-in procedures
as closely as possible. However, shortly after starting every few
minutes I had to give the motor a break due to heat. Thinking the motor
would be better after break in, I installed a micro temp circuit (
http://www.venom-racing.com/instructions/vst/revo/index.htm ) and
followed through with the break in process. I'm now on 6 tanks of gas
(125cc) and still have a motor the triggers the fail safe circuit after
a few minutes of fun. The temp trigger point is set at 285 degrees F.
Now suspecting air leaks I found a rather large obvious crack between
two pieces of plastic molding that houses gears between the starter and
back of the crank quality. Good quality high temp silicon sealing the
crack seams to help but the motor is still overheating. I'm unable to
find any visual air leaks at this point but the motor still hits 280
degrees at idle. Should I send this Revo back?

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Justin Mahn - 10 Jan 2006 22:18 GMT

> When breaking in this new motor, I followed Traxxas break-in procedures
> as closely as possible. However, shortly after starting every few
[quoted text clipped - 10 lines]
> find any visual air leaks at this point but the motor still hits 280
> degrees at idle. Should I send this Revo back?

You haven't said whether or not you tried turning out the main and idle
needles. These little engines need to run rich if they're overheating,
and you need to sacrifice a little performance to keep them cool. The
temp shutoff is probably saving you the purchase of a new motor, and I
think you were smart to put it on there.

Have you checked the driveline to be free rolling? A bind in the
driveline will make the motor work too hard.

Have you made sure that your filter is clean and freshly oiled? A
clogged filter will generally run rich, but it's alway a good thing to
check.

Have you made sure that your fuel line and your pressure line (exhaust
return) have no leaks and are connected on both ends? The fuel is
supposed to be under constant pressure, and a leak here would overheat
the motor.

Have you checked your fuel tank for leaks? Take it off the model,
keeping only fuel line and pressure line. Put it underwater by itself.
Pinch off the fuel line. blow into the return line, and see if any
bubbles come out before the lid vents.

And last but not lease, go over the engine to see if there are is fuel
dripping from anywhere it shouldn't be. The carb neck, rear shaft, and
head shims can produce leaks. A little fuel spray from the front
bearing is normal, but you can try replacing the bearing there for a
slightly better seal.

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Model Forum / Radio Controlled / Land Models / January 2006

Overheating Revo 280 degrees at idle