If a carburetor part doesn’t have a measurement can it be inspected?
‘Compared to a known stock part’ is the foundation from which any part can be compared. For example, while the width of the idle jet at the emulsion holes is not a call out the width or length from the threads to the tip can be measured using outside or a standard micrometer. The idle adjustor screw can be measured from the taper to the tip, overall length or from the thread to the tip compared to a known stock part.
I would suggest pre-measuring stock parts and have a written baseline. Give the racer the benefit of the doubt meaning a part that we measure as .001” different might be part manufacturing variance.
There is a rumor that people are modifying spark plugs. Are there any additional checks on that we can use under the current rule set?
‘As compared to a known stock part’ is the biggest catch all that allows for additional inspection. With your performance hat on there are two areas where performance could be gained. The first would be increasing the reach of the spark plug to increase compression/improve the flame front. Comparing to a known stock part the reach of the plug can be checked using the depth extension on your micrometer.
Secondly someone might try to modify the internals of the plug by removing the resistor. Spark plug resistors help prevent electrical interference of radio, cell phone, and computer equipment. The ‘R’ of RC12YC stands for resistor. So having a radio next to the engine while its running is a crude but simple way to alert you. An OHM reading compared again to a known stock part will also give insight if further inspection is needed. A functioning plug will first give you a delay as it takes energy to flow through the resistor but will read UNDER 1,000 OHMs. If there is a question or a need for a deeper inspection the top cap at the high tension lead will unscrew with force. This will render the plug inoperable and a spark plug IF tampering is not found should be given to the racer. A part for a part.
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