No problem with the questions. If you bothered me I'd just ignore you lol.

as for the wheels not "freewheeling", Mine wheels fine both ways, you should check your gear mesh at the pinion. Take a piece of regular printer paper, rip/cut it into an aproximately 1" wide strip, then wheel it between the pinion and spur gear. The paper should pull out wrinkled, but not ripped. http://www.youtube.com/watch?v=g5SWwdxOuCw

Check out this thread and the link in it to see how to adjust the 3rd gear shift. http://www.rcuniverse.com/forum/m_74...tm.htm#7440030


For tuning: I am assuming you have done the break in procedure as in the manual? Once it is broken in You just need to tune the high end needle, then the low end. I have posted the NX76 recommended settings below.

There are TONS of threads on here and tons of videos on Youtube on how to tune a nitro engine.

A big help in tuning the GST engine is putting a check valve in the line from the exhaust pipe to the tank. This helps stabilize the fuel pressure and makes tuning more consistent.
http://www3.towerhobbies.com/cgi-bin...?&I=LXEYG3&P=7

Some of the Biggest tips to nitro newbies are: Make sure your glow ignitor is FULLY charged!!!! Also, after the first few break in tanks, CHANGE the glow plug. Also, if you are having tuning issues, change the glow plug.

When you fire up the truck, let it get up to operating temperature before doing any tuning. Only turn the needles 1/8 turn at a time. Often that's all it takes.


I suggest you get an infrared temp gun. They are cheap and well worth it.

Recommended engine settings:
Top end: 3 ½ -4 turns out
Bottom end: Flush – 2 turn out from flush
Idle: 1mm gap
Recommended engine temp: 250-260 degrees Fahrenheit
Refer to these settings if your engine is not running properly. This will give you a good starting point.

Again, feel free to ask more questions.