Lot 8636: 1986 Honda ATC250 R

Great question! The 1986 Honda ATC250R is a legendary three-wheeler, but like any 35+ year old machine, it has some well-documented issues. Here are the most common problems and how to fix them:

1. Crankshaft Seal Failure (Most Common)

• Problem: The clutch-side crank seal fails, causing transmission fluid loss and excessive smoking
• Fix: Replace the seal - requires removing clutch and gears. Aftermarket seal kits are available for ~$30-50
• Tip: Always replace this seal during any engine rebuild as preventive maintenance

2. Fuel Tank Rust/Corrosion

• Problem: Steel tanks rust internally from moisture and stale fuel (as noted in your listing’s FAQs)
• Fix: White vinegar soak for 24-48 hours, then coat with tank sealer like Kreem or POR-15
• Alternative: Quality used tanks are available for $150-300 if yours is too far gone

3. Clutch Basket Problems

• Problem: Notched clutch basket causes poor clutch feel and engagement issues
• Fix: Replace with Hinson or OEM clutch basket (~$200-400)
• Tip: Many owners upgrade to newer sport quad feel when replacing clutch components

4. Carburetor Jetting Issues

• Problem: Stock jetting too rich, especially with any modifications
• Fix: Step down main jet to 145-150 range, adjust pilot to 45-48, needle clip position 2-3
• Stock baseline: Main jet 150-162, pilot 45-48, 1.5-2 turns on air screw

5. Transmission Issues

• Problem: Requires crankcase splitting for transmission repairs
• Fix: Best handled during complete rebuild - transmission parts are generally available
• Note: This is major surgery requiring full engine removal

Parts Availability: Good news! Most parts are still available through:

• Aftermarket suppliers (BVC Trikes, Rocky Mountain ATV)
• eBay for used OEM parts
• Service manuals are readily available for $20-40

Given that comparable 1986 ATC250Rs are selling for $4,400-$11,256, these machines are worth maintaining properly. The fuel tank rust issue is particularly relevant to the one you’re looking at - definitely inspect that tank carefully!

Would you like me to help you find similar ATC250Rs currently for sale, or do you have questions about any specific repairs?