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Hilborn #57 Rotator Spool SMALL ENGINES & on GAS
Factory Hilborn rotator spool #57 They all have to be fitted by polishing them in a Drill or on a lathe -GENTLY
#57 spool .100" wide ramp Great for GAS engines - helps plug fouling
For small engines like 1 cylinder and motorcycles - Alky or Gas ok. ( not for Big Harley engines - use a #54 for alky or #58 for blown alky )
Non-turbo
Non-blown
These rotors are for the standard Hilborn metering valve. O-ring included. Choose from:
A - #57 Small motor on GAS 40-500 cu in or methanol for 1 cyl engines 30-100 cu in
B - #54 Medium to large motor GAS or ALCOHOL this is the universal spool we prefer the 57 spool on almost all GAS engines
C - #61 or 58 Medium to large motor, moderate to 30% percentages of NITRO. Slot width: BIG unblown methanol over 550 cu in
A = .100"
B = .187"
C = .312"