Machines Needed for Motorcycle Repair

Published on January 7, 2024
Duration: 11:57

This video details advanced machining techniques for Harley-Davidson motorcycle engines, focusing on specialized fixtures and machine setups. Dragonman demonstrates methods for repairing damaged engine cases, replacing valve seats with specialized nickel alloy, relocating holes, and modifying components for increased compression. The content highlights the necessity of custom tooling and precise measurements for complex engine work.

Quick Summary

Advanced machining techniques for Harley-Davidson engines include using specialized fixtures for valve seat replacement with nickel alloy seats, relocating holes in welded cases using dial indicators and boring bars, and ensuring cylinder roundness with stress plates during boring. Compression can be increased by precisely machining the head gasket surface.

Chapters

  1. 00:00Introduction to Machine Shop
  2. 00:16Repairing Blown Out Case
  3. 00:36Valve Seat Machining Fixtures
  4. 00:43Nickel Alloy Valve Seats
  5. 00:56Measuring for Valve Seat Fit
  6. 01:23Cutter and Pilot Setup
  7. 01:49Jigs for Shovelheads/Panheads
  8. 01:55Machine with 100 Memories
  9. 02:05Resleeving Breather Gear Hole
  10. 02:14Using Dial Indicator for Hole Centering
  11. 02:25Boring Bar for Hole Repair
  12. 02:36Welding and Relocating Cam Holes
  13. 03:00Sportster Case Hole Relocation Fixture
  14. 03:28Panhead/Shovelhead Generator Style Holes
  15. 03:36Evolution Engine Barrel Stud Hole Relocation
  16. 03:51Counter Shaft Hole Relocation
  17. 04:16Knucklehead/Panhead/Shovelhead Hole Relocation
  18. 04:24Using a Punch for Hole Marking
  19. 04:42Valve Guide Hole Relocation Machine
  20. 04:59Oversized Valve Guides
  21. 05:08Custom Cast Iron Valve Guides
  22. 05:21Boring Tool for Valve Guide Holes
  23. 05:26Cutting Brass Seats
  24. 05:34Custom Flutes for Seat Cutting
  25. 05:46Interference Press Fit
  26. 05:49Jigs for Bearing Race Removal
  27. 05:55Harley-Davidson Valve Springs
  28. 06:03Removing Races from Rods
  29. 06:16Jigs for Race Installation
  30. 06:22Pinion Shaft Bushing Removal
  31. 06:31Fixture for Bushing Installation
  32. 06:36Rod Rebuilding Work
  33. 06:43Punches for Harley Bearings/Bushings
  34. 06:50Removing Timken Bearing Race
  35. 06:55Heating Aluminum Cases
  36. 07:11Stress Boring with Stress Plates
  37. 07:17Cylinder Stress Plate Setup
  38. 07:33Purpose of Stress Plates
  39. 07:45Importance of Round Bores
  40. 07:52Valve Grinding
  41. 07:55Valve Grinding Angles
  42. 07:59Automatic Honing Machines
  43. 08:04Turntable Setup
  44. 08:07Mandrels for Boring
  45. 08:16Rod Finishing Machine
  46. 08:23Harley-Davidson Rods
  47. 08:28Measuring Material Removal
  48. 08:33Turntable Work
  49. 08:33Honing Rockers
  50. 08:38Motor Testing Stand
  51. 08:44Dual Spark Plug Machining
  52. 08:51Fixtures for Miller Machine
  53. 08:55Holding Heads Under Miller
  54. 09:04Bolted Fixture for Dual Plugs
  55. 09:07Fixture on Machine
  56. 09:11Boring Hole for Spark Plug
  57. 09:41Threading Hole
  58. 09:50Nickel Seat Fixtures
  59. 09:54Seat Fixtures for Panhead/Shovelhead
  60. 09:56Seat Fixtures for Sportsters
  61. 09:58Cutter and Pedal Operation
  62. 10:04Floating Cutter
  63. 10:07Boring Old Seat
  64. 10:10Sportster Pocket for Seat
  65. 10:18Higher Compression Pistons
  66. 10:2510.5:1 Compression Piston
  67. 10:32Balancing Flywheels
  68. 10:388.5:1 Stock Piston
  69. 10:46Increasing Compression
  70. 10:52Cutting Flywheels
  71. 11:00Cutting Head Gasket Surface
  72. 11:0250,000ths Cut
  73. 11:0725,000ths Cut
  74. 11:13Avoiding Expensive Pistons
  75. 11:23Conclusion and Contact Info

Frequently Asked Questions

What type of valve seats are recommended for modern motorcycle fuels?

Nickel alloy valve seats are recommended for modern motorcycle fuels due to their resistance to degradation caused by alcohol and methanol content in gasoline. Standard seats can be compromised by these additives.

How is a precise interference fit achieved when installing new valve seats?

A precise interference fit for valve seats is achieved by using carbide-tipped cutters set 3 to 4 thousandths of an inch smaller than the diameter of the seat. This ensures a tight press fit when the seat is installed into the cylinder head.

What is the purpose of stress plates when boring motorcycle cylinders?

Stress plates are used during cylinder boring to simulate the tension applied by head bolts. This process pulls stress out of the metal, ensuring the cylinder bore remains perfectly round, as it would be when the cylinder head is bolted onto the engine.

How can engine compression be increased without expensive pistons?

Engine compression can be increased by machining the head gasket surface of the cylinder head. Removing 50,000ths of an inch typically adds 1.5-2:1 compression, while removing 25,000ths adds about 1:1, avoiding the need for heavier, unbalanced aftermarket pistons.

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