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can you convert 1970 honda phillips head to metric head: A complete guide

If you’re a motorcycle enthusiast working on a vintage 1970 Honda, you might have encountered the dilemma of whether or not to convert the bike’s Phillips head screws to metric hex heads. This isn’t just about aesthetics or modernizing the look; it’s about convenience, durability, and ensuring your beloved machine remains in prime condition for years to come. Let’s explore this topic in depth and uncover whether this conversion is worth the effort.

The Phillips Head Dilemma

The 1970s Honda motorcycles were designed with precision, but like many older models, they relied on Phillips head screws for various parts of the assembly. While these screws were standard at the time, they come with a few inherent issues:

  • Strip-ability: Phillips head screws are notorious for stripping, especially when dealing with rust or over-tightened parts.
  • Tool Compatibility: Phillips screws demand the exact size of a screwdriver to avoid damaging the slots, which can be limiting.
  • Modern Inconvenience: Most modern tools and mechanics favor hex or Allen heads for their durability and versatility.

If you’re tired of battling stripped screws or simply want a smoother maintenance experience, converting to metric hex heads might seem like a no-brainer.

Understanding the Conversion Process

Converting your Phillips head screws to metric hex heads is entirely possible, but it requires careful planning. Here’s a step-by-step breakdown:

  1. Identify the Screws to Replace: Begin by cataloging the screws on your Honda that you want to replace. Pay attention to the size, threading, and placement. Engine casings, side panels, and carburetor mounts are common culprits for problematic Phillips screws.
  2. Match the Threading: This is the most critical step. Metric hex bolts come in various thread pitches, and using an incorrect one can damage the internal threads on your bike. Ensure the new bolts match the original threading exactly.
  3. Choose High-Quality Bolts: Opt for stainless steel or grade 8 metric bolts for durability and resistance to rust. Cheap bolts might save you money upfront but can cause long-term headaches.
  4. Test Fit: Always test fit the bolts before tightening. Ensure they thread smoothly without resistance.
  5. Torque Properly: Over-tightening is a common mistake. Use a torque wrench to ensure the bolts are tightened to the manufacturer’s specifications.

Pros and Cons of the Conversion

Before diving in, it’s essential to weigh the pros and cons.

Pros:

  • Improved Durability: Hex heads are less likely to strip, making future maintenance easier.
  • Modern Aesthetic: Metric hex bolts give your vintage Honda a slightly updated look.
  • Easier Maintenance: You’ll find it simpler to work on your bike with standard hex tools.

Cons:

  • Authenticity Concerns: If you’re aiming for a show-quality restoration, replacing Phillips screws might detract from the bike’s originality.
  • Cost: High-quality metric bolts aren’t cheap, and the conversion can add up.
  • Potential Threading Issues: If not matched perfectly, new bolts can damage the original threads.

Alternatives to Full Conversion

Not sold on the idea of a full conversion? Here are some alternatives:

  • Anti-Corrosion Coating: Treat the existing screws with anti-rust coatings to extend their lifespan.
  • JIS Screwdrivers: Japanese Industrial Standard (JIS) screwdrivers are specifically designed for older Honda screws and work better than standard Phillips drivers.
  • Partial Replacement: Only replace screws in high-stress or frequently accessed areas, leaving less critical ones untouched.

Final Thoughts

Converting a 1970 Honda Phillips head to metric hex head is both practical and achievable, but it requires precision and attention to detail. Whether you’re a vintage motorcycle purist or a modern tinkerer, the choice boils down to your priorities: authenticity versus ease of maintenance.

If you decide to take the plunge, ensure you do your research, invest in quality materials, and take your time. After all, preserving the legacy of a classic Honda deserves nothing less than your best effort.

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