Valves - Honda FourTrax Rancher TRX420FE1 2019 Owner's Manual

Valves

Valve Inspection
Refer to Safety Precautions on page 101.
Valve clearance should be:
intake: 0.006 in (0.15 mm)
exhaust: 0.009 in (0.23 mm)
Excessive clearance will cause noise. Insufficient clearance will cause
loss of power and possibly damage the valves.
For those who are mechanically proficient and have the proper tools,
instructions on adjusting valve clearances are given in the official
Honda Service Manual. Otherwise, the valves should be adjusted by
your dealer.
154 Servicing Your Honda