18 X 36 is tall gearing on a E-50, i like 16 for hills 19 flats X45.
Ive done 10 or 12 of these K-Stars builds.
Everything from stock carb cruzers to 11K 19/21mm carb riper setups with 13 ports.
If you replace the ring every 500 mils and small end rod bearing and clips every 1,000 mils on 10+K RPM setups.
You can go 2,000 miles on a piston before the pin and ring land get loose.