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HomeAircraftHelicopterThunder TigerRAPTOR 50 › Raptor 50 Nitro engine tuning.
11-26-2007 09:56 PM  10 years agoPost 1



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I have a new Raptor 50 V2 with Thunder Tiger engine.
I am also new to Nitro engines.

The manual isn't very clear on how to set the correct mixture in order to lean it afterwards.

What position should the screw be which is located inside the throttle lever of the carburator? That is the low-mid setting right?

The other screw for higher throttle is set to 2.5 turns.

The engine is running ok, the temperature does not go over 90 degrees celcius, which I think is OK?
The engines smokes, which means it is rich and should be ok for running in the engine.

I think my setup is OK, could somebody confirm this? However I'm not sure about the little screw within the throttle lever.

Also, after a flight, I put the bird down and bring the throttle to idle, then suddenly the engines stops rapidly. According to the manual this would mean to the mixture is to rich in low rpm mode, which would mean I would have to lean the little screw inside the throttle lever, correct?
But I'm not sure what the initial position should be.

Any help would be greatly appriciated.



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11-27-2007 01:57 AM  10 years agoPost 2


Pittsboro, NC, United States

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My advice would be to read - it gives all kinds of advice on tuning. It sounds like you are on the right track, but I don't have a TT engine, so I can't be entirely sure.

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11-27-2007 01:58 AM  10 years agoPost 3


UK. Herts

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The TT engine is not as consistent in setup as others in so much as the varyations on needle settings. Once warmed up, do the pinch test to set the low needle then set the high needle for a 'comfortable' back plate temperature or 95 degC on the head.

Vegetable rights and Peace

11-27-2007 03:08 AM  10 years agoPost 4



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It appears the TT engine uses a fair amount of the low speed mixture for fuel in the hover power range. I bought my Raptor used, and found it didn't idle well...way too rich. So I went to work on the low speed and got it to idle nicely. Opps! Big mistake, it was WAY lean in hover. Put it back where it was...much better. It hovers and does moderate speed forward flight just fine with this setting, but the idle is a bit rich and I have to idle a bit fast. It seems to be the nature of the beast. A lot of people bad mouth this motor, but at my level of flying it seems to be just fine. Starts easy, needs a bit of warm-up before removing the glo starter. Temp good. If putting up with a bit rich on the idle is the only downside, I'll take it. I have a brand new OS 50 Hyper I was going to install, but the TT is doing just fine for the moment...might as well use it up!

Sounds like you are on the right track with your tuning. You can also touch the engine backplate immediately after a flight; you should be able to hold your finger on it for about 5 secs. If unable because it is too hot, you are too lean.

I put a Traxxas head temp gage(Used commonly on nitro trucks) on the engine just for kicks. It shows 215 normally, occasionally the highest.

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