+1. The existing threads are still there, just full of baked-on powder-coating.1 You do not cut new threads. You need a rethreading tap
For any other threads, read the fastener part number from the parts book and look it up in http://stainlessbits.com/link12.html for the thread.2 If the holes that are goobered up
No idea what's meant by "thread chaser" but, if all you can do with the bits is clean out existing threads, it'll be false economy. We're dealing with assemblies that four, five or more decades old and, although we revere and care for them now, most have survived periods when spares were difficult or impossible to get and several owners with a wide variation of mechanical skills.In the past I've seen thread chaser kits available from a few vendors.
'Cycle Engineering Institute'. It's a standard set of threadforms you'll find widely-used by Triumph for threads into iron and steel before the change to Unified threads from the late 1960's (e.g. the O.P.'s bike was built in '65). Threadform is also known by the abbreviations 'BSC' ('British Standard Cycle') or just 'Cycle'. While most of the the threads on your bike are the aforementioned Unified, it does have a few CEI threads and fasteners - e.g. those into the cylinder block.CEI?
Okay one of my spark plug holes, the threads were messed up to where threading the spark plug into it was difficult. One pass with the chaser cleaned everything up. The chaser is like a tap but not aggressive enough to tap new threads. It just straightens up the old ones.Hi,
No idea what's meant by "thread chaser" ........
And thread chasing doesn't require much torque. However if it does, then it's time to use the tap and dies. 8)..........If you bought something that can only clean out existing threads, worst case is it'll break in the hole you're trying to to repair or cut the thread. Then it'll cost you far more than simply buying good-quality HSS taps 'n' dies would've done in the first place. And you'll still have to buy a good-quality HSS taps or die...................
Those holes should be through holes, not threaded. A bolt/washer/nut secures them to the frame bracket.OK, just found some more that need re-threading/cleaning but can't find them in the parts book . They are threaded holes to receive bolts that secure the hangar plates for the rear footrests - see pic. (No21 in the parts book is a CEI 5/16 but also shows a nut and washer but my frame is threaded?) Any thoughts or help gratefully received. thanks