> I said "should" because a friend had neither the adjustable
> jets nor the adjustable needles in his TR250 carbs. Another
> Mix-n-DPO Match.
Not necessarily. The early emissions carbs were like that, with no mixture
adjustment (except the idle air bleed on the side). This was to avoid
"tampering" and ISTR was actually required by US emissions law. Later they
liberalized the law to only making the adjustment available to a
"technician", which is why it moved inside the piston shaft.
US carbs typically had a plug driven in over the adjustment, so you had to
actually break the casting to tweak the mixture.
Randall
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