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I've had this one for several years, it works great.
http://www.amazon.com/Duratrax-Flashpoint-Infrared-Temperature-Gauge/dp/B00144E8A4
this is going to sound crazy to you guys.... But on of the worst things you can do when tuning a nitro engine is rely on a temp gun... I use a temperature when I do breakins, but never for running.... Temperature really doesn't matter much with a nitro, they can run anywhere between 190 and 350 safely...And unfortunately they can be a cool as 190 degrees and sill be damagingly lean....or above 300 and still excessively rich............. temperature really is irrelevant when it comes to tuning, so much so I actually suggest most guys stop using a temp gun altogether as its probably hurting them more then its helping them...
The way to tune is by sound and performance....if a engine sounds good and performs good then it it is good no matter what the temperature is, it is truly that simple....If the engine is idling normal and performing nicely and my tamp gun told me it was 600 degrees i wouldn't change a thing......The reason for this is a overheating engine sounds terrible, they ring ping ping like crazy and will sound like your trying to crucify a goat.... If a engine sounds normal and is idling nice and low it is not overheating, no matter what the temp gun says...... If a engine has proper power and makes full RPM, then will idle down nice cleanly afterwards it is not too lean or overheating.... A engine thats too lean will ring ping ping and carry RPM after a high speed run,
the key to tuning is listening to how the engine idles and how it idles down after a high speed pass.....A properly tuned happy engine will idle down cleany after a hard run... It may have a slight 2 stage as it idles down, but only for a second or two at most, and afterwards the engine falls to a nice low steady idle........... If your engine can do this, idle down after a hard run it is not lean and it is not overheating..as this is something a lean overheating engine will do every single time
Now a improperly functioning linkage will simulate the sounds of a lean engine...as it will fail to return the throttle back to the true idle position, which will make the engine ring ping ping and sound lean....when all that is happening is the throttle is being held slightly open causing the engine to run on,,,,,
in the end drop the temp guns your engines will run nicer for it !