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1. A good "rule of thumb" method for turning your gearing to the desired RPM is this example:
Joe Racer is turning the engine 6000RPM at the end of the straight away, he would like to turn at 6800 at the end of the straight, now he is running a final drive of 5.04. Work the math this way:
6800 / 6000 = 1.13
1.13 x 5.04 = 5.70
5.7 would be the gear of choice.
2. If you break a set of quickchange gears, you must check the lowershaft for runout. 1-3 thousands is maximum.
3. In the heat of action at the race track, everybody always overtightens the rear cover bolts, the proper torque is 18 ft. lbs. for an original. 25 ft. lbs. if you torque a cover using a stud and nut.
4. Formula to Compute Final Drive
Small gear teeth number divides large gear teeth number equal spur ratio times ring & pinion equals final drive.
Example Set Number 18: 29 ÷23 = 1.263 x 4.86 = 6.13
Ratio x MPH x 336 = RPM RPM x Tire Dia. = Ratio
Tire Dia. MPH x 336
5. Beware of the oil used with a lightweight spool. A spool with holes drilled for lightness may cause foaming in the gear lube (depending on lube) and also adds tremendous drag on the engine.
6. All quickchange gears are matched sets. Never mix them with a gear from another set.
7. It is recommended that you always use at least 3/8 inch breather line on the top of the rear. Run that line up as far as possible and top it with a good breather filter, like a K&N or the equivalent.
8. About once a month, it is a good idea to remove your rear cover and use a long, flat aluminum file to clean up both edges of the mating surface. This will insure a clean, flat mating surface and guard against leaks.
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