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No experience with these, but downloaded this pic from BRF a couple years ago.

As far as I know, all the sizes are available, so from 59 down to 58. I don't think there's any advantage to going up to a larger jet, unless you're not getting enough fuel where you are now. More...

The standard from-the-factory jet varies over the years. I've found slight improvement going down one size from that factory jet. Two sizes smaller and the motor falls on its face from idle, but...

These are the basic measurements I've taken. Although the '70s vintage carbs are slightly smaller in some measurements, I have raced them with no noticeable ill effects.

We race these motors in GT Pro class in MN. To upgrade a 25, we just bolt on the big-bore carb and leave the 25 intake in place. In fact, the only test I'm aware of got slightly faster top with the...