Products - Frequently Asked Questions (FAQ)

Response is poor

Here's a checklist to help troubleshoot the problem:

Is the plug compatible?
If the plug temperature range is not of a compatible value, a stable rpm will not last. Furthermore, a worn plug will not only cause poor starting but also adversely affect throttle response. Therefore, periodically check the condition of the plug and replace it with a new one if worn.

Is the needle valve properly set?
Although it is essential to adjust the needle valve for maximum rpm, once the needle valve has been set, the response should be checked by flipping the throttle, etc. In particular, the idle adjustment screw greatly influences the response in the low rpm range.

Is the programmable throttle exponential adjustment set properly?
If the throttle exponential adjustment function is used and set incorrectly, there will be some play in the change in rpm with respect to the stick and trigger. It is preferable to carefully check the programmable throttle exponential adjustment.

Is the linkage correct?
Since the throttle control servo for the R/C car is used in combination with the brake, check that there is no interference with the linkage. Be sure the carburetor lever moves together with the operation of the throttle.

Is the needle valve checked while the engine is running?
The needle valve should be set not only right after the engine is started but should be reset and repeated after the engine has been run for a short time. The setting at the initial position will shift as the temperature rises. Thus, the needle valve should be set carefully.

Are the manifold and muffler securely connected?
Car engines are designed for high rpm. If the manifold and tuned muffler do not have lengths that are tuned to the pulsation of the intake and exhaust, the engine's true performance is not produced. Even if a standard muffler is used, care should be taken in its installation.

Is the gear ratio appropriate?
An extremely high gearing causes an excessive load to be applied and only damages the engine. As a result, the optimum power and torque band cannot be utilized. First set the transmission to a standard ratio and then proceed to the next step.