The 1987 Honda FourTrax 250 uses a 12-volt lead-acid battery, with typical capacity around 4 to 5 amp-hours. Replacement batteries in this era are commonly available in the 12V, 4–5Ah range, but the exact fit can vary by production run and regional specs. Verify the exact size by checking the manual or the OEM parts catalog for your bike’s VIN/date code.
Below is guidance to help you identify the correct battery size for your 1987 FourTrax 250, including common replacement options and steps to confirm the precise fit for your machine.
Common replacement battery sizes for the FourTrax 250
These sizes cover what you’ll typically find advertised for 1980s Honda FourTrax 250 models and many vintage ATVs. The right choice depends on the exact variant and how the battery tray and terminals are arranged.
- 12V, 4Ah lead-acid battery (flooded or AGM) — a common, period-appropriate option.
- 12V, 4.5Ah lead-acid battery — very similar footprint with a bit more cranking reserve.
- 12V, 5Ah lead-acid battery — widely used as a drop-in upgrade for better starting reliability.
- 12V, 6Ah lead-acid battery — offered for those who want extra cranking reserve, provided dimensions and terminals fit.
Concluding note: When selecting from these options, prioritize a battery that matches the tray footprint and terminal orientation of your bike. An exact OEM cross-reference ensures the best fit, but many aftermarket 12V, 4–5Ah batteries will work given proper mounting and wiring compatibility.
How to confirm the exact size for your bike
To avoid guesswork, follow these steps to verify the correct battery size for your specific 1987 FourTrax 250 model.
- Check the owner’s manual or Honda's official parts catalog for the exact battery group size or part number used by your bike’s model and year.
- Inspect the current battery label for voltage, capacity (Ah), and any group size markings, then use that information to guide your replacement choice.
- Measure the battery tray space: length, width, and maximum height, ensuring your new battery will physically fit without obstruction.
- Note the terminal arrangement (positive/negative positions) and confirm the replacement you select uses the same terminal layout or plan to adapt the wiring accordingly.
- Consider battery type: original-era bikes often used flooded lead-acid batteries, while modern replacements are commonly AGM; decide based on maintenance preference and vibration tolerance.
- If in doubt, contact a Honda dealer or an ATV parts specialist with your VIN and model/year to confirm the exact group size and part compatibility.
Concluding remark: By verifying the OEM specification, tray fit, and terminal orientation, you’ll ensure a reliable start and proper fit for your 1987 FourTrax 250.
Battery types and considerations
Flooded vs. sealed AGM
Older bikes like the 1987 FourTrax 250 typically used flooded lead-acid batteries, which require electrolyte checks and occasional maintenance. Modern replacements are often sealed AGM batteries that offer better vibration resistance and maintenance-free operation. If you choose an AGM, ensure the dimensions and terminal layout match your bike and that it fits securely in the tray.
When swapping to a different battery type, verify the mounting space, strap clearance, and wiring lengths to avoid interference with the air intake, fuel line, or frame components. In vintage applications, a well-fitting, properly secured battery is essential for reliable starting and electrical performance.
Summary
The 1987 Honda FourTrax 250 generally uses a 12-volt battery in the 4–5Ah range. To select a replacement, confirm the OEM group size or part number, verify tray fit and terminal orientation, and decide between flooded or AGM based on maintenance preferences and riding conditions. If you’re unsure, consult the official parts catalog or a knowledgeable dealer to ensure an exact match for your specific bike.