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-   -   Cen CT4 Tuning NX-15 (https://www.rcuniverse.com/forum/cen-racing-310/5186349-cen-ct4-tuning-nx-15-a.html)

gomanly 12-31-2006 02:47 AM

Cen CT4 Tuning NX-15
I just purchased a Cen CT4. This is my first nitro car. It appears to lack a bit of low end power and the manual that came in the box does not match the engine so I am not 100% sure which is the low end tuner and the idle screw. I think I know where the idle screw is but it appears to be in a spot where I cannot fit a screw driver, does this sound normal? I am worried that I might end up overheating the engine and doing some serious damage. Does anyone have a photo or a better manual so I can see where they are.


Digital Ninja 12-31-2006 04:04 AM

RE: Cen CT4 Tuning NX-15
hi yea tuning can be difficult but once you get it becomes second nature.
iam not sure if u went to the site but go to the cen's faq site http://www.cenracing.com/faq.html and ull see at the start of the page 'engine tuning guides' heading , just click the nx 15 link,

the black screw on the bottem where you caant reach witht he screw is the idle screw, normally u dont really have to muck around with that. ok the screw on the carb its the biggest one, coloured brass a bit and is where one of the fuel lines goes to is the high speed, the low end screw is located in front of the carb where it opens (thers like a black tube thing where one of your servo linkages is connected)
also you might wanna follow that manual its got some important tips.

gomanly 12-31-2006 08:46 PM

RE: Cen CT4 Tuning NX-15
thanks for the info, I'll give it a go. Scott.

notch 01-05-2007 05:40 AM

RE: Cen CT4 Tuning NX-15
it could be a gearing issue as well... refer to your manual for optional gears

Timmahh 01-05-2007 11:32 AM

RE: Cen CT4 Tuning NX-15
what color is the head of the motor? Green? if so you have the NX-15 motor. Great motor. if its new, your probably rich on the needle settings. you ll need to do some reading on tuning at breaking and tuning for performance. whats going on will depend on a few things like new or used motor. hot or cold outside, fuel and brand and nitro %, is the wind blowing east or west? these will all make a differance in how your motor will run that perticular time.

answer a few of these questions and we ll be better able to help out.


bennyhill 08-31-2021 01:59 AM

CEN Racing NX-15 Wont Start

I have 2 x NX-15 that I cannot get to start. I have tested the fuel, glow plugs, carb and rebuilt the engines. The problem I feel is piston pinch resulting in engine being hard to crank. I have an electronic starter that seems to struggle also. I have also heated engines to 60 degrees celsius to see if that helps.

I have the original engine manual, and cannot find any other hints in there.

If anyone has any advice, I would love to hear it!

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