MOTO1988 Regulator Rectifier & Ignition Coil Kit for Honda Rancher/Foreman 350-450 — Complete 4‑Piece Electrical Replacement

MOTO1988's kit supplies a regulator rectifier, ignition coil, spark plug and relay engineered to replace Honda part 31600-HM7-003 (replacement 31600-HN5-671) for Rancher and Foreman ATV models.

This complete electrical replacement kit brings four core ignition and charging components together in one purchase so you can restore reliable spark and stable charging on compatible Honda ATVs from the late 1990s through mid-2000s. The set is packaged with a regulator rectifier, an ignition coil, a spark plug and an electrical relay; each item is intended to match OEM fit and function for the listed Rancher 350, Foreman 400 and Foreman 450 model ranges. Before ordering, confirm your vehicle model and OEM part numbers to ensure compatibility.

Which Honda ATV models does this MOTO1988 kit fit?

The kit covers specific Rancher and Foreman model years that originally used manufacturer part 31600-HM7-003 or its replacement 31600-HN5-671. It fits several TRX350 and TRX400/TRX450 variants produced between 1997 and 2006. Double-check year and trim against your bike’s service manual or stamped OEM numbers to confirm fitment.

• Rancher 350: TRX350FE, TRX350FM, TRX350TE, TRX350TM (2000–2006)
• Foreman 400: TRX400FW (1997–2003)
• Foreman 450: TRX450ES, TRX450S (1998–2001)
• OEM reference: Manufacturer part 31600-HM7-003; replacement 31600-HN5-671

How will each component affect my ATV’s starting and charging?

Replacing worn electrical parts can restore dependable ignition and keep the battery charged during operation. The regulator rectifier regulates alternator output to protect the battery; the ignition coil produces the high voltage for the spark plug; the spark plug ignites the fuel-air mix; the relay controls circuit switching. Upgrading all four pieces at once reduces diagnostic time and mismatched wear.

• Regulator rectifier: stabilizes charging voltage to the battery and electrical system
• Ignition coil: generates the high-voltage pulse required for consistent spark
• Spark plug: provides combustion ignition with correct gap and heat range
• Relay: handles circuit switching for starter or ignition systems as specified

What should I check before installing this replacement kit?

Confirm OEM numbers, wiring harness compatibility and connector types to prevent installation issues. Inspect mounting points and any heat shields or brackets on your ATV so the new parts fit without modification. If you're not comfortable working on electrical systems, consider having a qualified mechanic complete the swap.

• Match the kit’s part numbers to your vehicle’s service manual and OEM tags
• Verify connector styles and wire colors for plug-and-play installation
• Check physical clearance for the regulator rectifier and coil on your frame
• Have basic tools and a torque wrench available for secure mounting

What after-sale support and warranty does MOTO1988 provide?

MOTO1988 provides product support and a limited service period to address installation questions or defects. The listing includes contact instructions for email support and specifies a one-year product service window—use these channels if components arrive damaged or fail under normal use. Keep purchase records and photos for faster assistance.

• Customer support available via email for pre-sale and post-sale questions
• One-year product service coverage for manufacturing defects
• Advice to verify compatibility with model numbers and OEM images before purchase
• Store or document packaging and receipts to speed any claims

Who is this for: This MOTO1988 kit is intended for owners and technicians maintaining late-1990s to mid-2000s Honda Rancher 350 and Foreman 400/450 ATVs who need a straightforward replacement for OEM part 31600-HM7-003 (or 31600-HN5-671). It suits riders who prefer a full electrical refresh in one purchase—useful for restoring older machines, preparing ATVs for season starts, or replacing failed charging and ignition parts identified during troubleshooting. If you need compatibility help or installation advice, contact the seller’s support before buying.