The Can-Am DS 70 is a popular youth ATV powered by a small two-stroke engine. Proper spark plug selection, gap, and maintenance are crucial for reliable starting, smooth acceleration, and optimal performance. This guide provides practical, up-to-date information on spark plug choices, replacement intervals, and troubleshooting tailored to the DS 70.
Understanding Why The Spark Plug Matters In The Can-Am DS 70
A spark plug ignites the air-fuel mixture in the DS 70’s engine, affecting starting reliability, idle stability, and power delivery. Worn or fouled plugs can cause hard starting, misfires, or poor performance. Because the DS 70 uses a small two-stroke engine, maintenance intervals are shorter than larger engines, and correct plug selection is critical for fuel efficiency and emissions control.
Recommended Spark Plug Types For The Can-Am DS 70
Choosing the right spark plug depends on the engine’s design and operating conditions. For most Can-Am DS 70 models, reputable spark plug options include:
- NGK BR8HS – A solid choice for two-stroke engines requiring a hot heat range with reliable ignition performance.
- NGK BR8S or BR7HS – Alternatives in the same family, offering variations in heat range to match temperature conditions and riding style.
- NGK BPR6ES / BPR7ES – Respected options when the engine prefers a bridge-type design and standard heat range. Check compatibility with the stock specifications.
Note: Different model years or regional configurations may have slightly different recommendations. Always consult the Can-Am DS 70 owner’s manual or a Can-Am dealer for the exact part number and heat range for your machine. The most important factors are correct thread size, reach, and heat range to prevent fouling or pre-ignition.
How To Determine The Right Spark Plug Gap
Correct spark plug gap ensures reliable ignition and optimal engine performance. For most DS 70 two-stroke engines, a typical gap range is between 0.6 mm and 0.8 mm, but the exact specification may vary by model year. If the service manual lists a specific gap, always follow it. When in doubt, start with 0.7 mm and adjust based on starting performance and plug condition after testing on a run.
When To Replace The Spark Plug
Follow these general guidelines for the DS 70:
- Inspection every 6 months or 40–50 hours of riding, whichever comes first, for signs of wear, fouling, or soot buildup.
- Replace when fouled, damaged, or when ignition performance declines, such as hard starting, misfires, or erratic idle.
- In dusty or high-heat environments, consider more frequent checks and replacements to maintain optimal performance.
Regular maintenance helps prevent aging-related ignition problems and keeps the two-stroke engine running cleanly and efficiently.
Step-By-Step: Replacing The Spark Plug On The Can-Am DS 70
- Prepare tools and parts: Spark plug socket, torque wrench, new spark plug, anti-seize compound (optional), and a clean rag.
- Cool the engine: Ensure the engine is cool before attempting a replacement to avoid burns and thread damage.
- Access the spark plug: Remove the access cover or side panel if required to reach the spark plug boot.
- Remove the boot and old plug: Gently twist to disconnect the spark plug boot, then use the spark plug socket to loosen and remove the old plug.
- Check the barrel and threads: Inspect the threaded hole for damage or cross-threading. Clean any debris.
- Install the new plug: Thread the new plug by hand to avoid cross-threading, then tighten to the manufacturer’s torque specification (usually modest for small engines). If using anti-seize, apply a small amount to the threads as directed.
- Reconnect the boot and test: Reattach the ignition boot, start the engine, and verify smooth starting and idle.
- Recycle old parts: Dispose of the old plug properly and store the new plug in a clean environment.
Tip: Always carry a spare spark plug and a small torque wrench in long road trips or competitive events for quick field maintenance.
Signs Of Spark Plug Problems And Quick Diagnostics
Watch for these indicators of a problematic plug:
- Hard starting or extended cranking time
- Rough idle or misfires at low RPM
- Loss of power during acceleration
- Sooty or oily deposits on the plug tip or around the combustion chamber
Diagnostics: If you suspect a plug issue, inspect the old plug’s color and deposit type. A light tan color typically indicates proper combustion, while black, sooty deposits suggest rich conditions or incorrect heat range, and white or blistered deposits indicate overheating or pre-ignition.
Maintenance Tips To Extend Spark Plug Life
- Use fresh, quality fuel and a reliable oil-mix ratio appropriate for two-stroke engines.
- Keep the air filter clean to prevent rich running and plug fouling.
- Regularly check compression and carburetor settings to ensure proper fuel-air mixture.
- Avoid short trips that prevent the engine from reaching optimal operating temperature, which can foul plugs.
- Store spare plugs in a clean, dry container to prevent contamination.
Common Misconceptions About Spark Plugs And The DS 70
- All spark plugs are interchangeable — Not true. Heat range and thread dimensions matter for proper ignition and sealing.
- More advanced spark plugs always improve performance — Using an incorrect heat range can cause fouling or overheating.
- Gap is irrelevant for two-strokes — Gaps impact ignition timing and power delivery, especially under load.
Where To Buy And What To Ask For
Trusted sources include Can-Am authorized dealers, OEM parts distributors, and reputable motorcycle and ATV retailers. When purchasing, have the DS 70’s model year and engine configuration on hand, and ask for the exact spark plug part number recommended in the manual. If you’re unsure, a service technician can confirm compatibility and perform the replacement.
Additional Resources And References
Consult the Can-Am DS 70 owner’s manual for model-specific spark plug specifications, heat range, and torque values. Manufacturer diagrams and official service bulletins can provide the most accurate guidance for your regional variant. For practical insights and community-tested tips, reputable ATV forums and Can-Am support pages are valuable supplemental resources.