There was a good mica KS5 with very little wear in my 16H when found. I dismantled and clead it and it used to run fine on unleaded fuel. Now with the new E5 fuel it misses on the pickup from low revs when the engine is under load, no problems onece the revs have picked up. I now run with a M50 that works fine. Pity as i like the look of the old KS5 with the copper cooling fins. As you say a collectors plug now.
