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metricmotoguy · 02-04-2024, 01:05 PM

So I got definitive answer on the OEM spark plug. It is a Torch D8TC, or D8RTC for the resistor option. The NGK direct equivalent is D8EA (#2120), or DR8EA (#7162) for a resistor plug. The gap should be 0.6mm-0.7mm.

NGK DPR8EA-9 (#4929), or the iridium version of that plug DPR8EIX-9 (#2202), is an incorrect application. The longer reach and wider gap are outside of spec.

Best advice is to use the recommended plug or its direct equivalent and change it every year. Many people are misled by iridium and the benefits of a premium plug. There is no real performance gain with a premium plug in such a low-tech, low-performing vehicle. Any time you change your spark plug the ride will feel better. Upgrading from Torch to NGK is enough to make a difference. In the long run your bike will be better off. A single DR8EA is less than $4.

I hope this helps someone else.

02-04-2024, 01:05 PM	#4
metricmotoguy Join Date: Feb 2024 Location: CT Posts: 4	update So I got definitive answer on the OEM spark plug. It is a Torch D8TC, or D8RTC for the resistor option. The NGK direct equivalent is D8EA (#2120), or DR8EA (#7162) for a resistor plug. The gap should be 0.6mm-0.7mm. NGK DPR8EA-9 (#4929), or the iridium version of that plug DPR8EIX-9 (#2202), is an incorrect application. The longer reach and wider gap are outside of spec. Best advice is to use the recommended plug or its direct equivalent and change it every year. Many people are misled by iridium and the benefits of a premium plug. There is no real performance gain with a premium plug in such a low-tech, low-performing vehicle. Any time you change your spark plug the ride will feel better. Upgrading from Torch to NGK is enough to make a difference. In the long run your bike will be better off. A single DR8EA is less than $4. I hope this helps someone else.
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