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Jim, sorry for the delay in replying, I haven't been online for a couple of days. Yes, the tapered pin is in the connection that is at the end of the shaft that comes out of the timing cover - it will be well hidden by grunge, and will have been wired in place so that it doesn't come undone all by itself!!. The pin is not very big - from memory the square drive on it is only 5 or 6mm. The other (more usual) cause of surging is because of incorrect adjustment of the "bumper screw" - which is the one on the opposite side of the timing cover to the tapered pin we were just discussing - and which has a screw head, and a locking nut on it to prevent movement. Surge can be adjusted out by screwing the bumper screw IN, and increasing the pressure on the bumper spring inside the timing cover. Do not overdo the adjustment, you want just enough to stop the surge, and no more. If you remove the dynamo, and mounting bracket, you will see a spring connected from the bracket that is attached to the shaft with the pin in it - within this spring is a shaft that should have no more than 10 to 25 thou of clearance between its lower end and the bracket. Adjust the clearance by gentle tweaking of the spring hooks with a pair of pliers. This is not easy to describe - but hopefully it will make sense when you see it!! Hope it helps . . . . .
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