Given how common ZS's were, its very easy to get the parts, as even in the states the vast majority of ZS's were adjustable. Unlike SU's, the piston/diaghram is not matched to the dome so interchangeable among different carbs isn't a problem. If you do happen to have a set of the original non-adjustable carbs on your 250, its easy enough to swap in a piston and needle from a later set of Strombergs with adjustable needle. Very interesting, I plan to check if they are over rich with a colourtune and go from there, awaiting new choke cable and a couple of vacuum pipe fittings. carbs or different needles to the Strombergs. Due to the fixed taper of those needles the tuneability is limited, so some have fitted S.U. Later ones were adjustable via raising or lowering the needles. In the day, 100K miles was something to crow about and TR250s often went well beyond that before needing engine overhauls ( as did plenty of Federal TR6s - 250K or more ).Īll the emissions Strombergs were set up for their respective engines and would work perfectly when new. What they do well is keep the mixture right on a correct original engine, allowing them to pile on miles and miles. Consequently they won't serve with different cams having longer duration. Original TR250 carburetors are not adjustable per se you could increase richness by raising the float levels or by stretching the springs but that's about it.
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