Can you tell me how the socket head cap (allen bolt head) was attached to the early type carb drain screws? Was it regular plumbers solder or were they MIG/TIG welded or brazed? (I don't have access to the last two)
I'm cleaning my spare set at the moment with a view to getting them to a working condition and I've just had one hell of a job getting the drain screws out and would prefer something easier for adjusting float levels in future
Socket-head to Pilot screws are attached with regular solder. The socket heads for the Drain screws must be "Silver" soldered (brazed) requiring a higher temperature
When done correctly the do stand the test of time.
1980 KZ 1300 sr# KZT30A-009997
Always High - Know Fear !
The following user(s) said Thank You: zed_thirteen
Thanks for feedback. I decided to progressively drill out mine to 3.5mm and then tap to M4. The Allen screws were then cut down, screwed in, and then silver soldered as Scotch suggested. I think this is the first time I've had any metal glowing bright red/orange since leaving school 43 years ago
Managed to get enough heat into the metal with my plumbing Map gas torch.