Wheels And Tires; Gear Oil - Eton America Matrix R4-150 Service Manual

Inspect the rear and brake lever and cable for excessive
play or other damage. Replace or repair if necessary.
Measure the free play of the brake lever at the end of the
brake lever.
The standard free play in those two-brake levels are
15-25 mm.

2.10 WHEELS AND TIRES

Inspect the tire surfaces for cuts, nails or other sharp
objects.
Check the tire surfaces when the tires are cold.
The standard tire pressure of front wheel is 18 psi.
The standard tire pressure of rear wheel is 25 psi.

2.11 GEAR OIL

Gear oil needs to be changed every year. There is a gear
Transmission Oil Filler Hole
oil release bolt at the rear of engine. Unscrew this
release bolt and let the dirty oil flow out. Allow 15minutes
for the gear oil to drain completely. Reinstall the oil drain
bolt and tighten it, then refill the oil to the gearbox
through the transmission oil filler hole. Then, reinstall
the transmission oil filler bolt.
Transmission Oil Drain