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Old 09-05-2011, 01:54 PM   #1
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breaking in new motor

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I've just installed a new motor in my Revo. It's a .18 TZ O.S. It's a little cool outside (10 celsius, but feels a lot colder, not t-shirt and shorts weather). Can I still break in the motor with out hurting it and I don't have a heat gun?

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Old 09-05-2011, 05:05 PM   #2
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Re: breaking in new motor

Pretty much any nitro motor can follow the same break in procedure. The major differences are in the type of piston/liner, (ringed or ABC). If it is an ABC type it likely will seem very tight at TDC and this can be exacerbated as temps drop due to the different expansion qualities of the alloy piston and steel liner. This is normal and once at normal operating temp it will be dimensionally correct.

Unless you are starting it sub-zero things should be fine if you follow the OS directions.

Another common point to make is any engine will benefit from proper warm up and afterrun treatment, regardless of age.

Post if you don't have any and I can list a standard procedure.
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Old 09-06-2011, 03:10 PM   #3
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Re: breaking in new motor

Hi Tori,

Yes, you can still break-in a new engine, if you must; set the HSN & LSN to factory. However, I would run the engine slightly richer, as the temperature decreases, overallm the engine will run on the lean side. So, richen a bit to be on the safe side.

You could also use a regular hair dryer to pre-heat the engine before starting, say, to about 180-200 F. Keep the temperatures around 220F or below while breaking-in the engine. Keep running the engine on the rich-side, there should be plenty of smoke and oil/fuel coming out of the exhaust, that's a good sign for breaking-in a new engine!

Good luck and have fun...


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Last edited by Jiver; 09-06-2011 at 03:16 PM.
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