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Honda VT750DC ACE
Task #18 - Spark Plugs
The ACE has two spark plugs per cylinder, so four plugs in total. They should be inspected at every service and
replaced every 12,800km or as conditions dictate.
Inspecting your spark plugs can tell you a great deal about the condition of your engine and how well in tune it
is. To help, I have constructed a simple guide for reading the conditions of your plugs. The pictures and
information were compiled from several other charts that various plug makers have published.
Recommended Plugs:
1. Standard: DPR8EA-9(NGK) or X24EPR-U9(DENSO)
2. Cold Climate (below 5°C, 41°F): DPR7EA-9 or X22EPR-U9
3. Extended High Speed Riding: DPR9EA-9 or X27EPR-U9
Recommended spark plug Gap:
0.80 - 0.90mm (0.031 - 0.035in)
To replace your plugs:
1. Disconnect the spark plug boots from the spark plugs. Avoid using pliers or any other tool to do this as you
can damage the plugs or the boot.
2. Clean any dirt from around the spark plug bases BEFORE removing the plug, to prevent it from falling into a
cylinder. Then remove the spark plug using the plug wrench supplied in your tool kit.
3. Inspect the plug using the guide above.
4. Check the spark plug gap using a feeler gauge and the values listed above. Adjust as necessary.
5. Reinsert the new plug (with washer attached) and thread it in by hand to prevent cross-threading. Hand
tighten the plug, then make an additional 1/2 turn to compress the washer. If reinstalling a used plug, you
should only turn the plug an additional 1/8 to 1/4 turn instead. The spark plug needs to be secure, but DO NOT
over tighten as the heads are made of aluminum and it is very easy to strip the threads.
Reinstall the spark plug boots.
28
Service Interval and Recommended Maintenance Manual
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