In other motor sport genres I've seen deep and difficult eligibility questions easily solved by making the in-question component free.
Often the big argument against a new freedom is the cost burden it may place on the rest of the racing fleet. In the case of a carby freedom for pre '85, as opposed say to legalising sequential change gearboxes in a car racing class that has only allowed for H pattern, the cost is almost negligible; no more than a set of new tyres or a pair of fork valves fitted.
This would have to be a possible result of a well prepared submission to MA.
PWK flatslides are a current model carby and now with throttle position switch and a 10 watt pressure pump supplied, solenoid controlled, power jet to help the midrange. A pre 85 submission would reasonably rule those out.
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You make a good point here and with a good rule change submission it could get up for the 2016 MOMS.
But as the current rules stand
16.15.13.1 Acceptable for the pre 85 class are machines and components built up to and including the 1984 model. The only exception to this rule is where the model remains unaltered after this date. Note it says machines and
components built up to and including the
1984 modelSo while the kiehin PJ flat slide may have been available as a spare part it would be for the 1985 model bike, so not legal.
However if kiehin had it available for sale (other than a Honda spare part). Maybe and that is a big maybe it could be considered legal, but that would be up to MA.
Again this is just my opinion.
Also there is nothing (currently) in the rules that say a lot of things currently used are ok. Also no where do the rules define major components or consumable items etc
Also you may ask why do I say in my opinion. Because that is what is it is. Just my opinion. The forum is useful to get opinion but very little said here is binding.