Originally Posted by
sidecar bob
Umm. . . . no, what I do is make spacers out of plastic tubing, that I put between the top cover & the spring, that I adjust the length of until the mid range is correct. Then I get a piece of cardboard & put a pen line on it on one end & another pen Line at the other end that is equal to the free length of the spring, plus the length of the plastic tubing, plus a tiny bit (very technical measurements at this point lol) to allow for the dead area that the tubing took up that the spring will later occupy. I then hold the spring by the ends & stretch it. You have to be extremely careful at this point because while it can easily be stretched, it can never be shrunk, so I carefully work the length up, until it matches the length marked on the piece of cardboard, usually good results are achieved first time. Then turn to the needle for fine mid range tuning (often raising it by one or two positions) & the main jet for top end,usually by having two sets of main jets & drilling one larger than the previous until I go too far, & then returning to the previous size (usually works out to be up by 10 to 15)
If it hadn't worked for me countless times over 25 years plus, I don't think I would have had the ball bag to post it up in such company.
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