Tech tips when working with your Vespa






Regularly (at least once a year) take out and grease the following bolts:
  1. Swing arm bolt
  2. The bolt securing the muffler to the engine.
  3. The bolt securing the lower end of the shock absorbers
  4. The one below the crankcase (a long bolt) holding the engine halves together. The head end of the bolt is at the end of the swing arm.

    If these bolts get stuck due to corrosion you will have severe problems with service/repair.

Loosening stuck bolts:

  1. Clean away as much of the corrosion around the bolt as possible
  2. Spray generously with CRC-556, Holts penetrating oil or other thin oil/rust solver
  3. Repeat step 2 times a day for a week (omit this if you are in a hurry but it really helps!!)
  4. Heat the area around the bolt with a blow torch or a welder until the oil starts to smoke.(Warm-air guns are too slow, the heat must be concentrated and intense)
  5. Turn the bolts by striking the spanner/wrench with a small hammer.
    NOTE:If you have to strike on the thread side of the bolt to get it out - first put on two nuts that are tightened together. The top threads of the bolt is below the upper part of the upper nut. In this way you save the top threads and if they still are damaged they will be restored when you remove the nuts. User short sharp blows and a small hammer.
  6. If this does not help, spray on more solver and repeat 4 & 5

Removing a screw with a damaged head:

My own private opinion is that easy-outs (conical shaped reverse thread screws) should be avoided like the plague. The shape makes the screw expand and stick even harder. Besides the easy-outs are prone to break and are very tricky to drill out. I recommend this method:
  1. Punch a mark for the drill in the damaged screws head. Be careful to have it absolutely centered.
  2. Drill a hole in the center of the screw using a drill that is almost the screw kernel diameter. To do this you need an upright drill. Do not even try to use a hand-held drill. The drill will most likely wander out to the sides and damage the threads.
  3. try to scrape away the top thread screw rests using a large needle or pointed plier, thereby exposing the top threads of the hole.
  4. Use a thread tap of the same size as the drilled screw and cut new threads. If you are lucky (and strangely enough you often are!!) the tap will run in the old threads and cut away the rests of the drilled screw. If it does not - try scraping away more thread to give the tap a new and better grip.

Contributions by myself and Guido Amisano