Products - Frequently Asked Questions (FAQ)

Maximum rpm not attained

Here's a checklist to help troubleshoot the problem:

Is the needle valve properly set?
The needle valve is first set so that a high rpm is reached when the rpm stabilizes after the engine is started. The air-fuel ratio is not optimum at starting so that no matter how much the throttle is opened the maximum rpm is not attained.

Has the engine been properly broken in?
Although the engine will run without a break-in period, it is preferable to perform proper break-in or running in to attain optimum performance. If break-in is performed with care, the engine's maximum rpm can be attained in a shorter time.

Is the plug appropriate?
The use of a recommended plug for each engine is assumed. However, it is possible that the use of a 4-stroke engine plug for a 2-stroke engine and vice versa may improve both the response and maximum rpm. In short, the important thing is whether or not the characteristic of the plug is compatible with the engine.

Is the linkage correct?
Even if the throttle of the transmitter is set to the high end, the carburetor could stop midway due to an incorrect linkage. Do not forget to check the throttle linkage during assembly and before operation of the R/C car.

Is the muffler securely connected?
If the muffler or manifold is detached or if the set length is incorrect for the tuned pipe engine, the set position of the needle valve will be incorrect. An incorrectly installed manifold will cause symptoms that are difficult to troubleshoot.

Is the load appropriate?
At a gear ratio for which the load is too heavy, the engine's torque band and power band will exceed the operating conditions and the engine's true performance is not realized. It is preferable to draw out the engine's true performance by using it at an optimum rpm and under appropriate load conditions.

Is there any problem with the fuel?
Also, is a special mixture of fuel used that doesn't match the characteristics of the engine? With an optimum basic combination of engine and fuel as a standard, a fuel containing a little more nitromethane may be tried.