Nitro motors 110cc, Manual

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Replacement of lubricating oil
After preheating and then quenching of engine, discharge the lubricating oil. (The position of lubricating oil drain plug is shown in Fig.15.)
When replacing of lubricating oil, elevate the car and place the chassis on a support (at a height for easy oil draining), place a receiver beneath the drain plug at
engine bottom, screw out the drain plug, take out screen and spring and completely discharge lubricating oil.
Clean the screen, spring and drain plug in clean oil.
Check “O” ring of screen for good conditions and replace the screen, spring and drain plug.
Fill fresh gasoline engine lubricating oil as in check of lubricating oil and check for leakage from the drain plug.
After replacing lubricating oil, re-fit the disassembled parts.
4.2 Selection and replacement of spark plug
Model of spark plug: A7RTC
Check of spark plug:
Remove the spark plug cap, move the spark plug with sleeve in tool bag, check its side poles and center pole for damage,
ablation and carbon, clear off the carbon (if any), check the gap between spark plug poles with feeler gauge and adjust the gap to
0.6-0.7mm (Shown in Fig.16)
Check the seal pad of spark plug for good state and replace the bad one, if any.
When re-fitting spark plug, in order to avoid mal-threading, firstly tighten manually and then tighten with sleeve.
Re-fit the disassembled parts
-Fig. 16-
4.3 Check and adjustment of valve clearance
The valve clearance shall be checked and adjusted in cold engine state.
Excessive valve clearance would result in noise and too small or even no clearance would impair closing of valve, ablation of valve and reduction of output power
and hence valve clearance shall be regularly checked.
The valve shall be checked and adjusted as follows: